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Protosialis casca
''Protosialis casca'' is an extinct species of alderfly in the Sialidae subfamily Sialinae. The species is solely known from the early Miocene, Burdigalian stage, Dominican amber deposits on the island of Hispaniola. ''Protosialis casca'' is one of only two known alderfly species present in the West Indies, the only other species is the living ''Protosialis bifasciata'' native to Cuba.〔
==History and classification==
The species is known only from the holotype, number "Mact 2090", which is a single male specimen currently residing in the private collection owned by Ettore Morone of Turin, Italy,〔 and was first studied by Michael Engel and David Grimaldi. Engel and Grimaldi's 2007 type description paper was published in the journal ''American Museum Novitates''.〔 The specific epithet "''casca''" was derived by the authors from the Latin ', which translates to "old" in reference to the age of the specimen.〔
When first described ''P. casca'' was named ''Sialis (Protosialis) casca'' by Engel and Grimaldi. They used the alderfly classification system put forth by Dr. Michael Whiting in his 1994 paper on the phylogeny of North American alderflies which treated ''Protosialis'' as a subgenus of ''Sialis''. Currently most taxonomists treat ''Protosialis'' as a separate genus from ''Sialis'' making this species ''Protosialis casca'' and ''Sialis (Protosialis) casca'' a synonym.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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