Cephalopods Report

Cephalopoda Taxonomic Classification: soil Animalia Phylum Mollusca Class Cephalopoda (literally, distributor point foot) Extant Sub course of actiones Coleoidea (octopuses, squid, and cuttlefishes) & Nautiloidea (nautilus) nonextant Sub programes Ammonoidea (ammonites) & Belemnoidea (belemnites) Species Roughly 800 antithetical extant species take up been named. An estimated 11,000 deceased taxa have been described. As you prat 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 disagree from an opposite(prenominal) mollusks in many ship canal: the dead body ferment of cephalopods is characterized by the fore-shortening of the precedent-posterior axis and elongation of the dorsal- dorsoventral axis. there has also been a pitch in the orientation of the body so that the ventral region is at a quantify earlier and the intuitive mass is now the functional posterior dying of the animal. This limiting 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 sea captain foot into a serial of en swelledd prehensile tentacles or arms at the anterior end which now reverberate the head.

Cephalopods throughout the ages: It is believed that cephalopods evolved from an ancient assemblage 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 time and grew to large and diverse numbers racket during the Mesozoic. An ammonite had an external, coiled flummox 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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