What does cephalopod literally mean?

Cephalopod literally means “head foot” in Greek, a reference to the way the cephalopod’s head connects to its many arms. The basic cephalopod body plan includes two eyes, a mantle, a funnel (also called a siphon), and at least eight arms.

What does cephalopod mean in Latin?

cephalopod (n.)

one of a class of mollusks notable for having tentacles attached to a distinct head, 1825, from French cephalopode, from Modern Latin Cephalopoda (the class name), from Greek kephalē “head” (see cephalo-) + pod-, stem of pous “foot” (from PIE root *ped- “foot”).

Does cephalopod mean head footed?

All cephalopods are types of Mollusks. … The name cephalopod, in Greek, means “head foot.” This name was applied because the foot of the organism is around the head. But cephalopods lack a traditional foot, instead having between eight and ten tentacles attached to their heads.

What does the term mollusk mean?

Definition of mollusk

: any of a large phylum (Mollusca) of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell broadly : shellfish. Other Words from mollusk Example Sentences Learn More About mollusk.

What is cephalopod quizlet?

A cephalopod is any member of the molluscan class Cephalopoda. … The nautilus is a pelagic marine mollusc of the cephalopod family Nautilidae, the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina.

What do cephalopods use their foot for?

The tentacles number 8 in octopuses, 10 in squids, and as many as 90 in nautiluses. The rest of the foot forms a muscular funnel, or siphon, which expels water from the mantle cavity, permitting cephalopods to move about by a kind of jet propulsion.

Do cephalopods have a shell?

Cephalopods with shells on the outside—like some extinct species and the living nautilus—might resemble snails. But, while snail shells have just one continuous space inside, the interior of cephalopod shells is divided by walls, or septa.

Where do cephalopods live?

the oceans
Cephalopods live everywhere in the oceans: near the shore in shallow water; far from land in the open ocean; in the ocean’s dark middle depths (the planet’s largest habitat); and in the deep sea.

Is cephalopod a fish?

Cephalopods are all marine. Fish live in both marine and freshwater environments, and there is in fact strong evidence that all marine fish have descended from ancestors living in fresh waters. … Each of the major forms of modern cephalopods has a fish counterpart: In tide pools and rocky substrata: Octopus vs.

Why did cephalopods lose their shells?

The evolutionary pressures favored being nimble over being armored, and cephalopods started to lose their shells, according to Mr. Tanner. The adaptation allowed them to outcompete their shelled relatives for fast food, and they were able to better evade predators. … Today most cephalopods are squishy and shell-less.

How do cephalopods hunt?

Until food satiation is obtained, cephalopods explore their environment looking for food. Known modes of hunting in cephalopods include ambushing, luring, stalking and pursuit, speculative hunting and hunting in disguise, among others (Table 2), described in detail by Hanlon and Messenger (1996).

Do cephalopods lay eggs?

Reproductive strategies differ between cephalopod species. In giant Pacific octopus, large eggs are laid in a den; it will often take several days to lay all of them. Once the eggs are released and attached to a sheltered substrate, the females then die, making them semelparous.

What does a cephalopod look like?

What Makes a Cephalopod? All cephalopods have either arms or tentacles, have blue-colored blood, and have the ability to use propulsion to help them move swiftly when needed. They use gills to breathe and are invertebrates (lack backbones).

Are cephalopods hermaphrodites?

Cephalopods are gonochoristic molluscs that show no hermaphroditism and the animals never change relationship. Their main sexual dimorphism is the presence of a hectocotylized arm in males, which transfers the spermatophores to the female.

Which of these is a cephalopod?

cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives.

What is a cephalopod fossil?

Fossils of cephalopods (sef’-al-oh-pods) have been found in rocks of many ages, and numerous representatives are alive today. Squids, octopuses, cuttlefish, and the chambered nautilus are among the cephalopods living in modern seas. Cephalopods are the most advanced of all animals without backbones.

What are the 4 groups of cephalopods?

Cephalopods are members of a class of marine animals that includes octopuses, squid, cuttlefish and nautiluses.

Which is not an example of a cephalopod?

Excretory system – Cephalopods possess a single pair of large nephridia which produce nitrogenous waste and excrete it out from the body. Therefore, from the above discussion it has been clear that Sea squirt is not a cephalopod.

What did cephalopods evolve from?

Cephalopods evolved during the Cambrian (∼530 Ma) from a monoplacophoran-like mollusc in which the conical, external shell was modified into a chambered buoyancy apparatus.

What are 3 characteristics of all cephalopods?

All cephalopods have the same basic anatomy. They’re made up of a body, a head and a foot. They have a muscular casing called a mantle which contains and protects their organs. They all have arms — at least eight of them — that are attached directly to their heads, but only some species also have tentacles.

What’s the difference between cephalopod and mollusk?

The most obvious difference between most cephalopods and other mollusks is the apparent lack of a shell. … They are also the only cephalopods with four gills instead of two.) Cephalopods have a more developed nervous system than other mollusks. They also have very well developed eyesight that is used in finding prey.

Do any land animals have tentacles?

Tentacles — boneless appendages that serve some prehensile or tactile purpose — appear in handful of animal lineages in the sea and on land. Vertebrates and invertebrates have tentacles. Among these differing kinds of animals, tentacles perform a variety of roles, including hunting and sensing.

What does non cephalopod meaning?

Non cephalopod molluscs are all molluscs except Nautilus, Paper Octopus, Regular Old Octopus, Squid and Cuttlefish (and also except a number of extinct groups like the Belemnoids and Ammonites).

What are cephalopods and non cephalopods?

Cephalopods are such molluscs whose legs are attached with the head. … – Octopus, Squids, etc. Non- cephalopods do not have such arrangements. Eg. – Snails.