单词	univalve
释义	univalve /ˈjuːnɪvalv / Zoology adjective Having one valve or shell.In the earliest Cambrian, one lineage developed a bivalved mineralized shell (Fordilla and its relatives), the other an endogastric univalve shell (the Helcionellids).... Vetustovermis bears a number of morphological features that are found in Kimberella, which has been interpreted to have a non-mineralized but stiff univalve shell. noun another term for gastropod.Thus, all rostroconches and some helcionellacean univalves technically become stem group bivalves.... Now explain how a univalve differs from a bivalve, in more ways than just the number of shells. But who speaks out for the univalve and the bivalve?
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