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Zigrasolabis : ウィキペディア英語版
Zigrasolabis

''Zigrasolabis'' is an extinct genus of earwig in the family Labiduridae known from Cretaceous fossils found in Myanmar. The genus contains a single described species, ''Zigrasolabis speciosa''.
==History and classification==
''Zigrasolabis'' is known from a group of fossils, the holotype, specimen number JZC-Bu232, along with two paratypes and a partial specimen. The specimens are composed of a three fully complete adult female earwigs, and the partial female, which have been preserved as a inclusions in a single transparent chunk of Burmese amber.〔 The age of the amber deposits in Kachin State in northernmost Burma are understood to be at least 100 million years old, placing them in the Albian age of the Cretaceous. As of 2014, Burmese amber has been radiometrically dated using U-Pb isotopes, yielding an age of approximately 99 million years old, close to the Aptian – Cenomanian boundary. At the time of description, the amber specimen was residing in the private collection of James Zigras and only available for study through the American Museum of Natural History.
The ''Zigrasolabis'' type specimens, recovered from amber bearing outcrops in Kachin State, were first studied by paleoentomologists Michael S. Engel of the Division of Entomology at the University of Kansas, and David Grimaldi of the American Museum of Natural History.〔 Engel and Grimaldi's 2014 type description of the new species was published in the journal ''Novitates Paleoentomologicae''.〔 The genus name ''Zigrasolabis'' was coined by Engel and Grimaldi as a combination of Greek word ''labis'', which means "forceps" and Zigras in honor of James Zigras. The specific epithet ''speciosa'' is from the Latin word ''speciosus'', which translate as "splendid". ''Zigrasolabis'' is one of six described earwig species found in Burmese amber. A second species, ''Toxolabis zigrasi'' was also described by Engel and Grimaldi in 2014 paper. Two species ''Astreptolabis ethirosomatia'' and ''Tytthodiplatys mecynocercus'' were described by Engel in the same 2011 paper, while ''Burmapygia resinata'' was described by Engel and David Grimaldi in 2004, with the last species ''Myrrholabia electrina'' first described by Theodore Cockerell in 1920.〔

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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