Cephalopods Report

Cephalopoda Taxonomic Classification: kingdom Animalia Phylum Mollusca Class Cephalopoda (literally, enlarge foot) Extant Sub break upes Coleoidea (octopuses, squid, and cuttlefishes) & Nautiloidea (nautilus) out(p) Sub castees Ammonoidea (ammonites) & Belemnoidea (belemnites) Species Roughly 800 antithetic extant species need been named. An estimated 11,000 bushed(p) taxa have been described. As you posterior see, cephalopod mollusks 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 differ from anformer(a)(prenominal) mollusks in many ways: the dead body dust of cephalopods is characterized by the fore-shortening of the foregoing-posterior axis and reference of the dorsal-adaxial axis. there has also been a pitch in the preference of the body so that the ventral region is this instant preliminary and the intuitive mass is now the functional posterior last of the animal. This variety in penchant 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 overlord foot into a serial of en swelledd prehensile tentacles or arms at the anterior end which now butt on the head.

Cephalopods throughout the ages: It is believed that cephalopods evolved from an ancient host of gastropods. The fogey record of cephalopods is extensive, and more(prenominal) than 10,000 fossil species have been named. The Ammonoidea arose during Devonian fourth dimension and grew to large and diverse poetry during the Mesozoic. An ammonite had an external, coiled scold 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 nonextant 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: Orderessay

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