prosobranch gastropods
prosobranch gastropods Single-gilled gastropods (Gastropoda), thought to represent the first stage in the evolutionary development of the group from the ancestral forms, the Archaeogastropoda.
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single , sin·gle / ˈsinggəl/ • adj. 1. only one; not one of several: a single red rose | the kingdom was ruled over by a single family. ∎ regarded separately… Metamorphosis , Metamorphosis, or a change in form, in biology means the transition from a larval stage to an adult stage. In most animals, embryonic development lea… Frasnian , Frasnian (Frasien)
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prosobranch gastropods