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The evolution of the Mollusca is the way in which one of the largest groups of invertebrate animals evolved. This phylum of animals includes gastropods, bivalves, scaphopods, cephalopods, and several other groups. The fossil record of mollusks is relatively complete, and they are well represented in most fossil-bearing marine strata. Very early organisms which have dubiously been compared to molluscs include ''Kimberella'' and ''Odontogriphus''. ==Cladogram== An understanding of molluscan phylogeny dating from 2006 is shown below, as a horizontal cladogram (source:〔Zoology 250 Phylogenetic Trees (2006) http://www.biology.ualberta.ca/courses.hp/zool250/Clades/clade08-Mollusca.htm〕). This cladogram is entirely out of date; most studies now agree on an Aculiferan topology, with aplacophorans derived from polyplacophorans. } }} }} }} }} |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Evolution of molluscs」の詳細全文を読む スポンサード リンク
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