Cephalopod

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Cephalopod

Scientific Classification
Kingdom Animalia Phylum Mollusca Class Cephalopoda
Orders
Subclass: Coleoidea Sepiida (Cuttlefish) Sepiolida (Bobtail squid) Spirulida (Ram's Horn Squid) Teuthida (Squid) Octopoda (Octopus) Vampyromorphida (Vampire Squid) Subclass: Nautiloidea Nautilida (Nautilus) Subclass: Ammonoidea Ammonitida

The cephalopods are a unique group of marine invertebrates within the phylum mollusca. The cephalopods are divided into two general types; the first one is called Nautiloidea with a few species of the pearly nautilus. The second one is called Coleoidea and includes the cuttlefish, squid, octopods, which is represented by about 700 species.[1]

Their fossils date back 500 million years ago, and it is believed by evolutionists that they appeared some time in the late cambrian, several million years before the first fish began swimming in the ocean.[2]

1 Anatomy
2 Reproduction
3 Ecology
4 Gallery
5 Related References
6 See Also

Anatomy

Cephalopod's swimming skill is different from other fish, they pumping water into their gills and jet out through the tube called siphon. The mouth of cephalopods are a hard and very sharp like bird's beak; the beak is very sharp, and it is used to grasp and tear food. And the eye of cephalopod is located in above and behind the tentacles; the eye of a cephalopod is very large size of the animal. [3]

Reproduction

Juvenile cephalopod from plankton

Cephalopods usually get most of the energy extracted from their food. And it(energy) is used for growing and the penis, and most male coleoidea is a long and muscular end of the gonoduct used to transfer spermatophores to a modified arm;it is called called hectocotylus. In species where the hectocotylus is missing, the penis is long and able to extend beyond the mantle cavity and transfers the spermatophores directly to the female.[4]

Ecology

All cephalopods live in the marine environment, where they are carnivores; from the warm water of the tropics place to the near freezing water at the poles. For example Antarctic octopus genera are closely related to some of the deep sea fauna. But nowadays, global warming and noxious water destroy cephalopod’s habitat. [5]