Cephalopods Report

Cephalopoda Taxonomic Classification: Kingdom Animalia Phylum phylum Mollusca Class Cephalopoda (literally, detail foot) Extant Sub crystallisees Coleoidea (octopuses, squid, and cuttlefishes) & Nautiloidea (nautilus) out(p) Subclasses Ammonoidea (ammonites) & Belemnoidea (belemnites) Species Roughly 800 antithetic extant species gift been named. An estimated 11,000 assassinated taxa have been described. As you cigaret see, cephalopods are a class within the phylum: Mollusca. The phylum Mollusca includes class Gasteropoda (gastropods, snails, and slugs), and bivalvia (bivalves, scallops, oysters, and clams), among new(prenominal)s. Cephalopods disaccord from another(prenominal) mollusks in many shipway: the dead body edition of cephalopods is characterized by the fore-shortening of the anterior-posterior axis and elongation of the dorsal- dorsoventral axis. there has also been a pitch in the predilection of the body so that the ventral region is in a flash anterior and the intuitive mass is now the functional posterior dying of the animal. This permute in orientation has implications for sensory function and cephalopod locomotion. The other major change from the basic molluscan plan exhibited by the cephalopods is the renewal of much of the first foot into a series of en swelledd prehensile tentacles or arms at the anterior end which now touch the head.

Cephalopods throughout the ages: It is believed that cephalopods evolved from an ancient group of gastropods. The fogey record of cephalopods is extensive, and to a greater extent than 10,00 0 fossil species have been named. The Ammo! noidea arose during Devonian time and grew to large and diverse rime during the Mesozoic. An ammonite had an external, coiled shell mistakable to that of Nautilus. Ammonites were very successful scientists have described 1,200 genera based on shell type from the Jurassic and Cretaceous Periods but became extinct at the end of the Mesozoic along with dinosaurs, some mammals, and other marine animals. Belemnoids, which also appeared in the...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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