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Elektrithone
''Elektrithone'' is an extinct genus of lacewing in the moth lacewings family Ithonidae. The genus is solely known from an Eocene fossil forewing found in Europe. At the times of description the genus was composed of a single species, ''Elektrithone expectata''.
==History and classification==
''Elektrithone expectata'' is known only from the one fossil, the holotype, specimen number SMF Be 2374, which is housed in the collections of the Senckenberg Forschungsinstitut und Naturmuseum in Frankfurt, Germany. The specimen is preserved as an inclusion in a transparent chunk of 46 million year old Baltic amber which was deposited during the Lutetian stage of the Middle Eocene. There is debate on what plant family produced the amber, with evidence supporting relatives of either an ''Agathis'' relative or a ''Pseudolarix'' relative. The fossil was first studied by the paleoentomologists Vladimir N. Makarkin of the Far Eastern Branch of the Russian Academy of Sciences, Sonja Wedmann of the Senckenberg Forschungsstation, and Thomas Weiterschan of Höchst im Odenwald, Germany. Their 2014 type description of the new genus and species was published in the online journal ''Zootaxa''. The genus name ''Elektrithone'' was coined by the researchers as a combination of the moth lacewing genus ''Ithone'' and the Greek word ''elektro'' meaning "amber", which is in reference to the finding of the genus in Baltic amber.〔 The specific epithet ''expectata'' is from the Latin word meaning "expected", alluding to the anticipated find of the family in Baltic amber. ''Elektrithone'' is the first member of Ithonidae to be discovered in Baltic amber.〔
Using the Comstock–Needham system for describing insect venation patterns, the ''Elektrithone'' CuP (cubitus posterior, the "rear elbow") venation is similar to members of the neuropteran families Brongniartiellidae and Osmylopsychopidae, in that the CuP in both families is short and not comb like. However, both families have wings with an anal area that has at least one or two highly branched anal veins, a character that is not seen in ''Elektrithone''.〔 The broad costal area of ''Elektrithone'' along with the strongly curved humeral veinlet, comb like MP (medial posterior) and CuA (cubitus anterior) veins and the series structure of the radial crossveins are all features seen in Ithonidae. The features found in ''Elektrithone'' are a mosaic of characters found in several genera of Ithonids.〔
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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