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Schwenckfeldina archoica
''Schwenckfeldina archoica'' is an extinct species of dark winged fungus gnat in the family Sciaridae known from a solitary Late Oligocene to Early Miocene fossil found in Mexico. ''S. archoica'' is the only species in the genus ''Schwenckfeldina'' to have been described from fossils found in Mexican amber.
==History and classification==
''Schwenckfeldina archoica'' is known from a single fossil, an inclusion in a transparent chunk of Mexican amber. The amber specimen, number ''SMNS Mx 367'', is currently housed in the fossil collection of the State Museum of Natural History Stuttgart in Baden-Württemberg, Germany. The holotype fossil is composed of a fully complete adult male.〔 Mexican amber is recovered from fossil-bearing rocks in the Simojovel region of Chiapas, Mexico. The amber dates from between 22.5 million years old, for the youngest sediments of the Balumtun Sandstone, and 26 million years old La Quinta Formation. This age range straddles the boundary between the Late Oligocene and Early Miocene and is complicated by both formations being secondary deposits for the amber; the age range is therefore only the youngest that it might be.〔 The holotype was first studied by entomologists Mónica M. Solórzano Kraemer of the Institut für Paläontologie, part of the University of Bonn, and Werner Mohrig of Poseritz, Germany. To better see the fossil, the amber was cut into a thick piece and polished with leather for clarity. Solórzano Kraemer and Mohrig's 2012 type description of the species was published in the Palaeoentomology journal ''Alavesia''. The specific epithet ''archoica'' was coined after the Greek word "archaic" as a reference to the great number of features shared between modern species and the fossil.〔
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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