Phylum mollusca

Phylum Mollusca Chitons, snails, clams, squids, octopi... 

The cone snails from all marine environments (Phylum Mollusca, Class Gastropoda, Order Sorbeoconcha) represent a large genus of approximately 700 carnivorous predator species (Figure 6). They are classified... 

Shell usually lateral ventral muscular foot present lophophore absent.Phylum Mollusca... 

Class Asteroidea, sea stars, is one of the most widely recognized groups of marine organisms due to their prevalence upon the shoreline and their characteristic shape. Asteroids are top predators in benthic ecosystems, often preying upon bivalves from the phylum Mollusca. The isoprenoid compound mytiloxanthin, for example, has been isolated from both the sea star Asterias rubens and the bivalve Mytilus edulis,119 The class Concentricycloidea was first identified in 1986 and consists of two species in the genus Xyloplax. Class Ophiuroidea, brittle stars, contains the greatest number... 

The characteristics of the phylum Mollusca include the presence of unsegmented coelomate protostomes and many examples are bilaterally symmetrical.23 The... 

Variation within the phylum Mollusca has been noted before. More species from the order Mesogastropoda again show that squalene and sterols can be synthesized. Although previous work with the class Bivalvia was unable to demonstrate the ability to synthesize steroids, androstane derivatives were metabolized.Detailed studies with the slug Ariolimax (order Stylommato-phora) showed how cholesterol was metabolized to pregnenolone, 17a-hydroxy-pregnenolone, and thus to androstane derivatives. 

The majority of biosynthetic work in the phylum Mollusca has focused on the nudibranchs, one of the larger orders of Ophistobranch mollusks. The diet of nudibranchs includes sponges and tunicates and thus the biosynthetic origin of compounds isolated from these organisms must be established through experimentation. 

BIOACTIVE METABOLITES FROM SOUTHERN AFRICAN MARINE MOLLUSCS (PHYLUM MOLLUSCA)... 

The class Cephalopoda is the most complex taxa in the phylum Mollusca, consisting of a large group of marine organisms of more than 700 species. They appeared in the Cambrian period (over 500 million years ago), but the majority are now extinct. 

The study of cone venoms is probably the most important and advanced branch of research on the phylum Mollusca because of their biological properties and since the recent issuance of an NDA for ziconotide (Prialt , SNX-111), which is used as a pain reliever in hospitals.More than... 

There is a risk of confiision between the terms Sacoglossa, which is an order of the phylum Mollusca (Protostomes), and Sacco ssus, which is a genus of the phylum Hemichordata, class Enteropneusta (Deuterostomes). 

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