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Allorapisma
''Allorapisma'' is an extinct genus of lacewing in the moth lacewings family Ithonidae. The genus is solely known from two Eocene fossils found in North America. At the time of description the genus was composed of a single species, ''Allorapisma chuorum''.
==History and classification==
''Allorapisma chuorum'' is known only from two fossils, the part side of the holotype left fore-wing, specimen number SR 08-14-01, and the part side of a paratype right fore-wing, specimen number SRUI 08-04-01. Both the fossil are currently housed in the collections of the Stonerose Interpretive Center Republic, Washington, US. The specimens are preserved as compression fossils in silty yellow to grayish shale, which were recovered from outcrops of the Tom Thumb Tuff member of the Klondike Mountain Formation.〔 The formation is approximately Early Eocene, Ypresian in age, being radiometrically dated as .
''Allorapisma'' was first studied by the paleoentomologists Vladimir N. Makarkin of the Far Eastern Branch of the Russian Academy of Sciences and S. Bruce Archibald from Simon Fraser University in Burnaby, British Columbia. Their 2009 type description of the new genus and species was published in the online journal ''Zootaxa''. The genus name ''Allorapisma'' was coined by the researchers as a combination of the moth lacewing type genus ''Rapisma'' and the Greek word ''Allo'' meaning "other", which is in reference to the similarity of the new genus to ''Rapisma''.〔 The specific epithet ''chuorum'' is honor of the Chu family from Kirkland, Washington who found the holotype and donated it to the Stonerose Interpretive Center.〔
Overall the vein structure of ''Allorapisma'' is most similar to the genus ''Principiala'', known from Cretaceous fossils found in both Brazil and England.〔 Following the Comstock–Needham system, the wings of both genera show the apical end of the Rs vein fused to the MA vein. Both have similar positioning and shaping of the MP vein and the CuA vein running parallel to the MP vein. As such, Makarkin and Archibald suggested the two be grouped in an informal suprageneric group called the ''Principiala'' group. This group is one of three possibly monophyletic groups in Ithonidae, the others two being the ''Ithone'' group and the ''Rapisma'' group.〔 Before the merging of the families Ithonidae and Polystoechotidae in 2010,〔 ''Allorapisma'' was the first Ithonidae fossil to be described from the Cenozoic.〔
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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