Saying "octopi" is incorrect (unfortunately). download full PDF here, Octopus: An interesting Undersea Creature. With the highest brain-to-body-mass ratios of all invertebrates higher even than those of some vertebrates the octopus is regarded as the smartest of all invertebrate animals. the daily activity pattern of Octopus vulgaris in natural . The species is notable for its color, with blue rings across its body that are extremely bright. The Atlantic pygmy octopuses arms reach just under 4, making it one of the smaller species of octopus. It is the second largest phylum in the animal kingdom. Inner layers of cellulose and outer layer of pectose. They are invertebrate cephalopods with a high degree of intelligence and excellent visual acuity. Question 6. It is a cephalopod having 8 arms and without a shell. Their observation power is very close to that of human beings. Phylum Mollusca contains soft body animals usually protected by a calcareous shell and a ventral muscular foot. Very few are terrestrial and found in moist soil. They are aquatic invertebrates, meaning they have no backbone like we do. Mantle tubular completely enclosing the body. Phylum is a taxonomic ranking that comes third in the hierarchy of classification, after domain and kingdom. Human blood is red because its oxygen-binding protein, hemoglobin, contains iron. Octopuses have fairly short lifespans, with some species only living for an average of six months. Squid, cuttlefish and nautilus belong to this class as well. While the flapping fins are used for propulsion, the tentacles act as a rudder to control the swimming direction and are how the octopus crawls along the seafloor. There are separate sexes of octopuses. These creatures move in a variety of ways. Predators of Octopuses include eels, sharks, and dolphins. These small members of the cephalopod family are also related to other octopus species, along with squid, cuttlefish, and nautilus. View all of our Octopus pictures in the gallery. Octopuses have three hearts. The arms are joined at their bases by a web of tissue known as the skirt, at the centre of which lies the mouth. What is the primary characteristic of octopus? Introduction to Phylum Mollusca. They do not have a head, tentacles, eyes, jaws and radula. Educational video for kids to learn about another group of invertebrate animals: mollusks. Cell wall of green algae is made up of. V. As per the recent researches octopi can learn very quickly. They exhibit organ system level of organization. Q.4. The common octopus, O. vulgaris, primarily lives in tropical and temperate seas around the world. These small brains are clusters of nerve cells that allow each arm to work independently of each other. The largest Dumbo octopus ever recorded was 5 feet 10 inches (1.8 m) long and weighed 13 pounds (5.9 kg), but most species are an average size of 7.9 to 12 inches (20-30 cm) long. See answer (1) Best Answer. The average size is 16 feet (4.9 m) in length from the top of its body (mantle) to the tip of its arms. If you get stuck do let us know in the comments section below and we will get back to you at the earliest. Shells of oyster are mixed with tar to make roads. After delivering the spermatophores, males become senescent, which means that they gradually deteriorate before dying. A. The octopus is an aquatic animal which has eight-limbed molluscs of the order Octopoda. The weight of juvenile octopus is increased by 5 per cent every day because of its constant feeding habits. . Many species formerly placed in the genus Octopus are now assigned to other genera within the family. This phylum includes all animals with a notochord, a dorsal hollow nerve chord, and a muscular postanal tail. 5. Therefore, humans are among the octopuss top predators.In the wild, octopuses are preyed upon by many other creatures. MP 2022(MP GDS Result): GDS ! David Burnie, Dorling Kindersley (2011) Animal, The Definitive Visual Guide To The World's Wildlife, Tom Jackson, Lorenz Books (2007) The World Encyclopedia Of Animals, David Burnie, Kingfisher (2011) The Kingfisher Animal Encyclopedia, Richard Mackay, University of California Press (2009) The Atlas Of Endangered Species, David Burnie, Dorling Kindersley (2008) Illustrated Encyclopedia Of Animals, Dorling Kindersley (2006) Dorling Kindersley Encyclopedia Of Animals. Octopuses are animals that have existed for many millennia; the first known octopus fossil, Pohlsepia, is believed to have lived more than 296 million years ago. The octopus bears the following characteristics: Octopi are categorized as predators and they attack their prey by dropping down on them and enclosing it with their arms. Symmetry: They usually show bilateral symmetry. Octopuss prey on crabs, fish, and scallops. The shells of several molluscs are of ornamental value. The life cycle of octopus is divided into four stages namely, the Egg (stage 1), the Larva (stage 2), the Juvenile (stage 3) and the Adult (stage 4). These three features are seen in every member of this phylum, even humans. Open-ocean species of octopus primarily consume other cephalopods, prawns and fish. However, some are found in intertidal zones, and others are found in abyssal depths. Anterior head. For instance, with the advent of genetic testing many groups that were thought to be monophyletic were found to have very different genetics. Additional Information. WATCH: Sharks biting alligators, the most epic lion battles, and MUCH more. The juvenile octopi begin to develop at a rapid pace during this stage. These creatures typically live in dens that are found in holes or crevices along the rocky bottom of the sea, which is in line with their retiring and secretive nature. 1998). The blanket octopus' predators include larger fish and whales! This phylum is where the octopus and its relatives are grouped together. 1. Therefore, they are classified as carnivores. So blood color is blue or green. III. Unless they are mating, they are typically solitary. The octopus holds the distinction of being the most intelligent of all invertebrate animals. Molluscs are mostly seen in Marine and freshwater. 1. Heart of two pairs of auricles and a single ventricle. The study of molluscs is known as Malacology and the study of the molluscan shell is known as Conchology. The body of molluscs is unsegmented with a distinct head, muscular foot and visceral hump. There are 13 families in the order Octopoda which contains approximately 300 species. This is a fairly new type of species that was identified in 1998. This Latin term is derived from a couple of Ancient Greek words okto, which means eight, and pous, which means foot. Therefore, the term octopus means eight feet, which reflects the fact that these creatures have eight feet, which are more commonly referred to as arms. Thank you for reading! They can be seen near the shorelines, in open oceans and on the floor of the ocean. Their arms are joined at their bases by a web of tissue thats known as a skirt; their mouth is found in the center of the skirt and doesnt contain teeth, but instead has a pair of sharp beaks and a file-like organ known as a radula.Octopuses soft bodies can change shape rapidly, allowing them to squeeze through very small spaces. These defining characteristics include a mantle with a mantle cavity, a shell (except where lost), visceral mass, foot, and radula.The odontophore is in the mouth of most mollusks and it supports the radula (a ribbon of teeth). The octopus belongs to the phylum mollusca, where you will also find its slimy next of kin, the clams, snails and slugs. Upon reaching maturity they start to reproduce. However, it needs to be noted that theyre only for experienced hobbyists. Unlike most geckos, tangerine leopard geckos have movable eyelids. What are the 6 classes of the phylum Mollusca?Ans: The 6 classes of the phylum Mollusca are Monoplacophora, Amphineura, Scaphopoda, Gastropoda, Pelecypoda and Cephalopoda. All dumbo octopuses have the characteristic umbrella shape caused by webbing between their tentacles and all have ear-like fins they flap to propel themselves through the water. Nevertheless, the life cycle of octopus has a huge significance as it provides an insight into the life of oceanic invertebrates. The phylum Mollusca is defined by several special characteristics. Once they hatch, miniature versions of the parents tiny octopods emerge. They use their beaks, which are very sharp, to tear apart prey. There are various pieces of evidence to support this, but again, specific numbers are not available.Why are cephalopod and, by extension, octopus populations growing? Head distinct and large with well-developed eyes and mouth. Along the coast of Sulawesi is where most of them are located. There are three hearts in an octopus; two of them pumps blood to the gills and blood is circulated to the rest of the body by the third heart. They are able to find their way back to their dens without any trouble even after traveling far distances. Octopuses thin skin also absorbs some oxygen from the water. In some species, the ink contains a venom that paralyses the sensory organs of the attacker. An octopus is defined as any eight-armed cephalopod mollusk of the order Octopoda. However, blue-ringed octopus are not aggressive and a 2008 study found just 3 known fatalities linked to the species. Blue ringed octopuses are some of the most venomous marine creatures in the world. 4. Other mollusks are grazers and some are filter feeders. 1. Molluscs. The body is enclosed in a bivalve shell and laterally compressed. An octopus has a round head and a mantle along with eight arms. Biologydictionary.net Editors. Like humans, many animals lose some of these features as they develop. Sperms can be stored for several weeks after mating by the certain species of octopi. However, these creatures do face numerous threats. They can also crawl along the ocean floor and pull their arms into small openings to take in food. Usually shelled having a mantle. One researcher who calls octopuses "the wizards of camouflage" goes so far as to say that chameleons are humdrum by comparison [source: Stewart]. A common form of octopus such as O. Vulgaris has the ability to lay more than 10,000 eggs and the eggs are laid in small holes and under rocks. This answer is: . This image depicts the relationship between all of kingdom Animalia's phyla. Phylum Mollusca (Mollusks) Characteristics They are mostly found in marine and freshwater. : 2 Department of Aqualife Medicine . Octopuses have a robust muscular tube in their body called a siphon. Considered a delicacy by many cultures, they are hunted regularly by humans. Hatanaka, H. (1979). The mollusks include all the snails, slugs, clams, mussels, squids and other soft-bodied animals. It terms of species, it only has around 50,000 described species. Where Do The Octopi Live And What Is The Eating Habit Of The Octopus? Book a free counselling session. 2. Although it is very small, it lives roughly 13,100 feet below the surface of the water. In fact, recent studies have suggested that populations may be booming. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. Biology Dictionary. Octopus is rich with a brilliant sense of touch, powerful beak-like jaws and venomous saliva. The bacteria, including the archaea, are grouped into roughly 34 phyla, although the relationships between these groups are not as well established. They often secrete a shell to protect their soft bodies. In particular, they mostly feed on crabs and other crustaceans. . Below are some of the most fascinating species of octopus. Octopus (genus) Octopus is the largest genus of octopuses, comprising more than 100 species. The qualities that group animals into a phylum have changed throughout scientific history, as better methods have arisen to determine how groups of animals are related. 2. If you are preparing for Assam Board class 11 and are keen to learn the chapters, then you must refer to the best books and study materials. Octopus has blue coloured blood. Neopilina is a segmented mollusc. They have a hard beak, with the mouth at the center point of the arms. The size of octopus varies spending on its genus. The name cephalopod comes from the Greek words kephalos for head and podos for foot. The shell of many molluscs is of ornamental value, i.e., used in. Therefore, it is erroneous to refer to octopuses as fish. Octopuses belong to the class Cephalopoda. Characteristics of Mollusca: Soft-bodied. According to the IUCN, most species of octopus are not endangered. Contact the AZ Animals editorial team. There is no known antidote to this toxin which causes temporary paralysis. Characteristic features of Phylum Arthropoda The body structure shows bilateral symmetry. Although we can find cases where an octopus kills a smaller shark, the size disparity is simply too much for an octopus to overcome. The diversity of the arthropods comes from their ability to adapt their hard exoskeleton into almost any shape or function. On average, females lay around 100,000 eggs at one time, and it takes between four to eight weeks for them to hatch. They feed on large fishes, seals and whales. Generally, they are found in warm, tropical water. Development is accompanied by metamorphosis which usually includes a trochophore larva. Predatory, bottom-dwelling species of octopus primarily live off of crustaceans, polychaeta worms and clams and other mollusks. They arent migratory, so they spend their whole lives in the same general area.Octopuses also have an excellent sense of touch. The body is segmented into three regions - Head, Thorax and Abdomen. The blue-ringed octopus isnt a species, but rather a genus. Is an octopus a. According to the research the venom is not made by them but the symbiotic bacteria produce it. Malacology. This is because of the fact that they possess the largest brain and equipped with a complete and well developed central nervous system. The two creatures do have a shared cousin, but it existed more than 500 million years ago. What Are The Characteristic Features Of An Octopus? Answer: The branch of science which deals with the classification of organisms is called taxonomy. It acts as a support for the nerve cord and is replaced by the vertebral column after the embryonic stage in all vertebrates. Have some feedback for us? General features: They are commonly called soft bodied animals. Arthropods and Annelid, both include worms while cnidarians mostly include marine animals such as corals, hydras and jellyfish etc. In place of the protective shell found in many other mollusks, the octopus brandishes a startling array of defense mechanisms. An octopus uses it to blast water and can even swim backwards. Inner layer of cutin and outer layer of pectin. Octopuses belong to the mollusk order. The characteristics of these octopuses vary according to the species, but share some of them.Their main features relies in their toxicity, since each of them have a very dangerous poison. Squid, cuttlefish and nautilus belong to this class as well. The genus is quite typical of most octopods. Technically speaking, octopuses have nine brains. Their body has a cavity. The members are marine forms, and some are freshwater forms. By far the largest individual phylum, the Arthropoda includes all the segmented animals will hard skeletons that we know as insects and crustaceans. Aplacophora or Solenogaster Bilateral and cylindrical body shape. Correct Answer - Option 4 : Mollusca The correct answer is Mollusca Characteristics of Mollusca: Exercise 5.3 Class 11 Maths NCERT Solutions: In this article, students can find NCERT Solutions for Class 11 Maths Chapter 5 Ex 5.3. It is believed that there could be other habitat locations for them that simply haven't been found yet. See all of our entertaining and insightful animal articles. Each arm bears two rows of fleshy suckers that are capable of great holding power. Some of the examples of animals belonging to Phylum Mollusca are Pila, Unio, Octopus, Sepia, etc. Octopuses belong to the family Octopodidae. The above octopus seen in the Bonin Islands near Japan in. Some squid hunt in large predatory packs which work cooperatively to bring down large prey. If the octopus is left without the water it can only survive for a couple of minutes and then die. It lives at least 13,100 feet (4,000 m) below the surface. The octopus belongs to the phylum mollusca, where you will also find its slimy next of kin, the clams, snails and slugs. The species of Octopus also affect it due to the different sizes of these animals. At the initial stage, octopods drift in the plankton for a long span of time before entering into the bottom of the ocean. Different hypotheses of how a phylum is related to other phyla (plural of phylum) create different cladograms, which display the relationships visually. A very significant characteristic of the octopus is its ability to squeeze itself into surprisingly small cracks and crevices. Octopus vulgaris lives in tropical and semitropical waters in oceans around the world; from the Atlantic, Indian, Pacific Oceans and the Mediterranean Sea (Quetglas et al. The shells are present or may be absent in some; univalve and usually coiled. These are mostly marine habitats, and some are freshwater habitats. They also have defense mechanisms, including venomous saliva and ink screens, that allow them to outwit their prey and many of their predators. Octopus have become increasingly popular pets for aquarium enthusiasts. B. Learn more about us & read our affiliate disclosure. They are in the order of mollusk, along with other soft-bodied animals like clams, snails,. The typical octopus has a saccular body: the head is only slightly demarcated from the body and has large, complex eyes and eight contractile arms. Octopuses belong to the Kingdom Animalia. It seems that when the normal food sources for these types of animals are hard to find they will become more . The body is divided into head, visceral mass, muscular foot and mantle. A. Brittle stars, unlike other starfish, filter feed from the environment. Purchasing through these helps us further the A-Z Animals mission to educate about the world's species.. 1 / 12 Octopuses are masters at flying under the radar, changing their coloration and texture to match their surroundings in seconds. This was the first documented use of tools by an invertebrate and is further evidence of how intelligent these creatures are. Dorsal visceral mass. Flattened limpet-shaped shell with spirally coiled protoconch. (59 kg). This creates a gap in the food chain that may be advantageous to these eight-armed creatures. Octopuses have three hearts. 1. Their eyes are shaped like a kidney and bulge out of the socket like the eyes of the bovine animals. Inderwater Assoc. Monophyletic is a term that describes a complete group, with all the common ancestors. Their large, complex eyes are located on the top of their head.As noted earlier, the largest specimen of the giant Pacific octopus on record had a 30-foot arm span and weighed approximately 600 pounds. The octopus has evolved most since the cephalopods originated more than 600 million years ago. Ventral foot. This phylum includes everything from the smallest fish and tunicates, to the great apes. The size of the smallest octopus is around 5 cm in length while the size of the largest octopus is around 6 meters in length. In particular, human fishing removes large numbers of octopuses natural predators from the sea. 3.51 A). No parental care is provided beyond the care that is given by the female while waiting for eggs to hatch, so baby octopuses are on their own.Most species of octopus, including the common octopus, mate during the winter. A variety of marine fishes are known to consume octopuses, for example. 3. Liopleurodon were fast swimmers that lived entirely under water, but they had no gills. Octopi are located in all the water bodies of the world. Molluscs are found in nearly all freshwater and marine environments, and some are found also on land. On the next page, find out more about the octopus's magical ability to change colors in less than a second. The classification of the Phylum Mollusca are as follows: Some of the examples of the phylum Mollusca are as follows: Classification of PilaKingdom: AnimaliaPhylum: MolluscaClass: GastropodaOrder: ArchitaenioglossaGenus: Pila, Classification of SepiaKingdom: AnimaliaPhylum: MolluscaClass: CephalopodaOrder: SepiidaFamily: SepiidaeGenus:Sepia, Classification of OctopusKingdom: AnimaliaPhylum: MolluscaClass: CephalopodaOrder: OctopodaGenus: Octopus, Classification of UnioKingdom: AnimaliaPhylum: MolluscaClass: BivalviaOrder: UnionidaFamily: UnionidaeGenus: Unio. They are adapted to be fierce predators that are able to attack and paralyze prey with relative ease. Octopus belongs to _____ phylum. The weight of the giant octopi ranges between 50 kg to 272 kg and 30 feet in length. Unless you thought of an octopus or one of the insects in the rainforest pavilion, chances are you thought of an animal in the phylum Chordata. CBSE Class 10 Results likely to be announced on May 5; Check how to download CBSE 2019 Class X marks, Minority Students Scholarships: 5 crore minority students to benefit in next 5 years with scholarships, says Mukhtar Abbas Naqvi, Education Budget 2019-20: Rs 400 Cr allocation for World Class Institutions & Other Highlights, APOSS SSC Hall Ticket 2020: Download APOSS Class 10 Admit Card Here, NSTSE Registration Form 2020: Get NSTSE Online Form Direct Link Here, 8 2020: (Current Affairs Quiz in Hindi: 8 April 2020), APOSS Inter Hall Ticket 2020: Download AP Open School Class 12 Hall Ticket. The veined octopus, Amphioctopus marginatus, was observed in 2009 excavating coconut half shells from the ocean floor and using them as part of its den. These octopuses have a transparent-looking skin and are found in three different colors: red, pinkish, and yellow-orangish. Second, dumbo octopuses have completely lost their ink sacs. 2. An octopus is classified under the phylum Mollusca and class Cephalopoda. In this article, we have provided detailed information on Phylum Mollusca. These three features are seen in every member of this phylum, even humans. Blood consists of copper containing pigment called haemocyanin. Their alimentary canal is coiled with large paired digestive glands. As a result, the prey is pulled into their beaks and broken up. These are marine and have an elongated body with a reduced head. The four stages of the life cycle of octopus are discussed vividly in the following paragraphs: Octopi lay eggs after fertilization. Phylum. A. Human activity is also believed to play a role in population increases. It is one of 88 different known phyla. These are mostly marine habitats, and some are freshwater habitats.2. Most die within about two months.Eggs, which are about 1/8th of an inch long, are laid by female octopuses in holes and under rocks. Octopuses have a closed circulatory system, in which the blood remains inside blood vessels. The size of octopi generally differs. They arent easy to track not only because they cant be tagged but also because they are so solitary and reclusive in nature. (3 to 10 kilograms). Organisms in a phylum share a set a characteristics that distinguishes them from organisms in another phylum. The nervous system comprises a paired cerebral, pleural, pedal and visceral ganglion joined by the nerve connectives and commissures. Some of the species of octopus survive only for six months. The phylum Echinodermata contains starfish and their relatives. Even if the octopus uses camouflage, it cant hide from a shark completely. Octopuses are carnivores because they subsist solely off of other creatures. The male octopi die after a few months of mating. Arthropoda 4. The mantle is a highly muscled structure that houses all of the animal's organs. Its gills, hearts, digestive system and reproductive glands are all crammed into this one space. 5 While most are quite small, some can reach six feet. Study now. Studies on the fisheries biology of common octopus off Northwest coast of Africa. However, it is believed that the population of cephalopods, including octopuses, has boomed significantly since the 1950s. Previously, it was named Octopus dofleini. Octopuses are amazing creatures. Although all octopuses are technically venomous, only one species of them is capable of killing humans with venom: the blue ringed octopus. Along with that they have two fins on their head and two tentacles. These ears are large fins which look like elephant ears and help them 'fly' through the water. Octopus Classification This phylum is classified into 7 classes, namely, Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. C. The starfish and all their relatives possess pentamerous radial symmetry. Most commonly, the octopi live at the bottom of the ocean. Unlike other octopus species, dumbo . 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Even the largest species of octopus are able to pass through openings as small as 1 inch in diameter. Very few are terrestrial and found in moist soil. Respiration occurs by ctenidia . Q.1. Octopi can learn by observing the other octopi. identifying characteristics continued non-segmented soft body and mantle head, muscular foot and viseral mass head contains sensory organs, mouth, and cerebral ganglia (extremely primitive brain) muscular foot used for locomotion can be anything from long tongue like structures for crawling, to tentacles for capturing visceral Complete Guide to Classification of Animals, This Baby Owl Hearing Thunder for the First Time Is the Cutest Thing Youll See Today, 5 Animals That Can Shapeshift To Trick Prey And Predators, Watch a Huge Octopus Steal a Photographers Equipment and Refuse To Let Go, Canadian Fisherman Pulls Bald Eagle and Blood Red Octopus Locked In Mortal Combat, Octopus Spirit Animal Symbolism and Meaning. Octopods have no internal or external skeleton, allowing them to squeeze through tight places and hide. Res. Some cephalopods have tentacles as well as arms, but the octopus manages just fine with the eight arms it uses for practically everything: eating, moving, hunting, tasting and mating. This phylum includes everything from the smallest fish and tunicates, to the great apes. Not all blood is red like ours; the octopus's blood is blue. They seem to prefer warmer waters and muddy . Dumbo octopuses are the deepest-dwelling of all octopus species, found as far as 13,000 feet under water. There are currently four species of blanket octopus known. The arms are endowed with one or two rows of suckers but these never have hooks or sucker rings. It shows how E. dofleini travels from kingdom Animalia to phylum Molluska via the purple line. Octopuses are actually a type of mollusk like a snail which is in turn a type of cephalopod. To be fair, personality is a hard thing to prove, but Mather and marine biologist Roland C. Anderson pinned down a method for the study: They . This appendage inserts packets of sperm, which are known as spermatophores, directly into the mantle cavity of female octopuses. Its like reproduction is the only purpose of their life. 2002), but the common octopus is generally found in the "near shore zone" (Miesel et al . There are three hearts in an octopus; two of them pumps blood to the gills and blood is circulated to the rest of the body by the third heart. Retrieved from https://biologydictionary.net/phylum/. Phylum - Mollusca (Gastropods, Bivalves, Cephalopods) There are more than 50,000 species in this phylum. These are soft-bodied animals with an outer covering of calcium shells. Because of this, the arthropods have adapted to survive in every environment on the planet. From class 6 onwards, the students enter the secondary section. This gives the valuable time to the octopus that it can escape. It then passes through the gills before being expelled by the siphon. However, the term octopi is popularly used to describe more than one octopus. 13 March 2008. An average adult weighs 132 lbs. Dicyema sphyrocephalum (Phylum Dicyemida: Dicyemidae) isolated from Korean common octopus Callistoctopus minor in Korea : Ilson Whang, 1 Beomseok Lee, 2 Rahul Krishnan, 2 Hiroaki Nakajima, 3 Hidetaka Furuya, 3 and Sang Phil Shin 4: 1 Department of Genetic Resources Research, National Marine Biodiversity Institute of Korea (MABIK), Seocheon 33662, Korea. But sometimes they are also found on the surface of water drifting alongside planktons. They will discover that they are very different from one another, . ADVERTISEMENTS: 2. Octopus belongs to the class Cephalopods. The deepest living genus of octopus is known as the dumbo octopus. Body Form: The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump. The octopus has 8 arms, averaging 20 cm long for an adult. Octopus is known as devil fish. The Dumbo octopus is the deepest-living genus of all known octopuses. A number of researches have been conducted on the intelligence of this sea creature. This post may contain affiliate links to our partners like Chewy, Amazon, and others. Two hearts pump blood through their gills while a third pumps blood throughout the body of octopuses. The blanket octopus is immune to the deadly sting of jellyfish tentacles! Arthropoda is the largest Phylum in the animal kingdom. Molluscs like oysters, squid and cuttlefish are used as food in many countries. The common octopus (Octopus vulgaris) is 12 to 36 inches (30.5 to 91.4 centimeters) long and weighs 6.6 to 22 lbs. The octopus also has eight arms, which are covered in suction cups. The phylum Mollusca is defined by several special characteristics. Only one species of octopus, the blue ringed octopus, is poisonous to humans. In this case, they inject prey with a paralyzing saliva.Most octopuses are solitary and spend roughly 40 percent of their time hiding in dens. In these cases, the phylum is split into multiple phyla. They have jointed limbs. True octopuses belong to the genus Octopus, a massive group of broadly distributed shallow-water cephalopods that also includes squids and cuttlefish. Reproduction, or for that matter, mating is quite a serious business for octopi the very first reason being only one per cent of around 200,000 eggs an adult octopus lay gets to survive and reach adulthood. The word cephalopod literally means "head-footed" and refers to the fact that these animals' arms branch directly off of their heads. The members of the Phylum Mollusca are soft-bodied animals, unsegmented with a distinct head, muscular foot, and visceral lump. Question 5. Who proposed the five kingdom system of classification? They fall under the classification of cephalopoda and under the order Octopoda. In what type of habitat do Octopuses live? They are triploblastic, bilaterally symmetrical with organ system level of organization. Rep., 1966-1976, 77-83. MP 2022 (MP Post Office Recruitment): Phylum Mollusca: Have you seen snails during rainy seasons? The sea urchins and sand dollars are closely related to starfish, but secrete a hard shell for protection. The body is elongated dorsoventrally and bilaterally symmetrical with the head and trunk. However, the giant Pacific octopus is known to live for up to five years. Is octopus a reptile? Primarily found in benthic marine habitats. Intra-epidermal nervous system. Leading AI Powered Learning Solution Provider, Fixing Students Behaviour With Data Analytics, Leveraging Intelligence To Deliver Results, Exciting AI Platform, Personalizing Education, Disruptor Award For Maximum Business Impact, Phylum Mollusca: Characteristics, Classification & Examples, All About Phylum Mollusca: Characteristics, Classification & Examples. Though "octopi" is colloquially sound and very fun to say, the correct plural of octopus is octopuses. The foot is ventral, large, flat and muscular. They are rich in antioxidants, fatty acids, iron, calcium, etc. At this stage, octopods are fed by larval crabs, larval starfish and larval lobsters. Another distinctive features is that octopus have three hearts. Learn about our collection and study of molluscs; including chitons, clams, mussels, snails, nudibranchs (sea slugs), tusk shells, octopus and squid. The best-known octopus of this genus is the species Hapalochlaena lunulata known as the large ringed octopus, despite its vernacular name, it is a small octopus whose size does not exceed 10 centimeters, with . The body is divided into head, visceral mass, muscular foot and mantle. The life span of the octopus is very small. Modern phylogenic systematics, or simply phylogenetics, uses a variety of traits to map the changes between different groups of animals. The octopus is classified as one braWhat is an octopus classified as?An octopus is classified under the phylum Mollusca and class Cephalopoda. The behaviour of Octopus vulgaris Lam. Phylum : Porifera or sponges. They look like adult octopi and stay at the surface of the ocean. There are around 300 different Octopus species! As an Amazon Associate I earn from qualifying purchases. Non-ganglionated nerve ring around the mouth with two pairs of interconnected nerve cord. Respiration by gills in most forms and through the wall of the mantle cavity in some animals. As diverse as this phylum is, all its animals include three physical traits. They can be found in all types of habitats - land, water and soil. Over \(160000\) species have been described, of which around \(128000\) are living and about \(35000\) are recorded as fossil species. 3. Molluscs Nudibranchs. An Octopus can travel at speeds of up to 27 miles per hour. Which of the following could be an argument why the phylum is not a good unit to use? The presence of haemocyanin makes the blood of the octopus blue. There are almost 500 million neurons are found in its arms which help them to touch, taste and grip their prey. Phylum Cnidaria, Class Hydrozoa 2. Only female blanket octopuses have their famed blankets! Octopi are sexually mature and ready to mate when the octopi enter into this stage. Thus, Leisure Suit Larry, a particularly touchy-feely octopus; Emily Dickinson, a recluse; and Lucretia McEvil, who destroyed the interior of her tank, became the starting point for a revealing study. The males do not have a cape at all. Q.5. Phylum Mollusca Hard shell: snails, clams, octopus . 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