Prosobranchia

Prosobranchia is an extinct subclass of marine gastropod mollusks. These animals were characterized by having a single shell, which was typically coiled in a spiral. They possessed a distinct head with tentacles and eyes, and their foot was adapted for crawling on various substrates. Prosobranchs were a diverse group, inhabiting a wide range of marine environments from shallow coastal waters to the deep sea. Their feeding habits varied, with some being herbivores, others carnivores, and some detritivores. Fossil evidence indicates that Prosobranchia existed from the Cambrian period to the present day, though many lineages became extinct over geological time. The classification of Prosobranchia has undergone significant revision with advances in molecular biology and phylogeny, and the term is now considered by some to be paraphyletic, meaning it does not include all descendants of a common ancestor. Modern gastropod classification often places the former members of Prosobranchia into different clades based on more current evolutionary understanding.