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Galeommatoidea
Order of bivalves From Wikipedia, the free encyclopedia
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Galeommatoidea is a superfamily of bivalves classified in the monotypic order Galeommatida.
Galeommatoids exhibit symbiotic relationships with many different groups of benthic and burrowing invertebrates.[1] An ectocommensal species, "Parabonia" squillina, has been found to be nearly mutually exclusive with burrow-wall commensal species of Lysiosquilla.[2] Galeommatoids are capable of active locomotion, crawling on their foot like a snail.[3]
Galeommatoidea is a member of the heterodont bivalve clade Imparidentia, but its precise placement within that clade is poorly resolved.[4][5] As it falls outside of previously recognized imparidentian orders, it is classified in an order of its own, Galeommatida.[5] The monophyly of Galeommatoidea is strongly supported by molecular phylogenetic analyses.[1][4] However, the internal classification of Galeommatoidea is controversial, and it has been divided into various poorly defined families that may not be monophyletic.[1] Over a dozen family names have been proposed within Galeommatoidea,[4] but as of 2024, only three families, Basterotiidae, Galeommatidae, and Lasaeidae, are listed as accepted in MolluscaBase.[6]
Galeommatoidea is a species-rich group.[4] As of 2010, it was estimated that Galeommatoidea contained approximately 500 species in 100 genera.[7]
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References
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