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''Lethacotyle vera'' is a species of monogenean of the family Protomicrocotylidae Johston & Tiegs, 1922.〔Johnston, T. A. & Tiegs, O. W. 1922: New gyrodactyloid trematodes from Australian fishes together with a reclassification of the super-family Gyrodactyloidea. Proceedings of the Linnean Society of New South Wales, 47, 83-131.〕 The species is ectoparasitic on the gills of the brassy trevally, (''Caranx papuensis''), off New Caledonia and was found only in this locality.〔 It is the second species of the genus ''Lethacotyle'' Manter & Prince, 1953 described after the type-species, ''Lethacotyle fijiensis'' Manter & Prince, 1953.〔 The genus ''Lethacotyle'' is special in that its members have no clamps on their posterior attachment organ or haptor, in contrast to most polyopisthocotylean Monogeneans which have clamps. The body of adult ''L. vera'' is 2.7-5.4 millimetres in length. The body is elongate, flat, with a pointed head showing two anterior suckers. There are numerous anterior testes and a single posterior ovary. The eggs bear two elongate filaments. The copulatory organs include a sclerotised cone-shaped vagina, 125-175 µm in length, and a male copulatory organ, comprising a ring of 21-27 spines which are 50 µm in length.〔 The length of the spines of the male copulatory apparatus is the main diagnosis character of the species, which allows its separation from ''L. fijiensis'', the only other species of the genus. The posterior part of the body of ''L. vera'' is asymmetrical. It bears two lateral flaps and a terminal lappet which is striated, and there are no clamps - this is a characteristic of the genus ''Lethacotyle''.〔Manter, H. W. & Prince, D. F. 1953: Some Monogenetic Trematodes of marine fishes from Fiji. Proceedings of the Helminthological Society of Washington, 20, 105-112.〕 The etymology of the name of the species was, according to the authors of the taxon,〔 "''vera'', Latin for true, because ''Lethacotyle'', a genus differentiated by absence of clamps, was based on true observations". ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lethacotyle vera」の詳細全文を読む スポンサード リンク
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