Michat Mariano C, Alarie Yves, HÁjek JiŘÍ
University of Buenos Aires, Faculty of Exact and Natural Sciences, Department of Biodiversity and Experimental Biology, Laboratory of Entomology, Buenos Aires, Argentina. CONICET-University of Buenos Aires, Institute of Biodiversity and Experimental and Applied Biology (IBBEA), Buenos Aires, Argentina..
Zootaxa. 2018 Nov 20;4524(1):121-131. doi: 10.11646/zootaxa.4524.1.9.
The three larval instars of Huxelhydrus syntheticus Sharp, 1882, the only species of the New Zealand endemic genus Huxelhydrus Sharp, 1882, are described and illustrated including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. Larvae of this species are characterized by the absence of the primary pore ABc, shared with all other known Bidessini larvae and therefore representing a potential synapomorphy of the tribe. Third instars of Huxelhydrus can be separated from those of all other known Bidessini genera by the following combination of characters: larger size, mandibular pore MNa located in a clearly distal position with respect to pore MNb, and presence of secondary setae on dorsal surface of protarsus, on posteroventral surface of all tarsi, and on urogomphus. First instars, on their part, can be distinguished by the presence of: an occipital suture, the primary pore PAk, a ventroapical spinula on antennomere 3, and an anterotransverse carina on meso- and metathorax.
描述并图示了1882年夏普命名的合成胡氏龙虱（Huxelhydrus syntheticus Sharp）的三个幼虫龄期，它是新西兰特有属胡氏龙虱属（Huxelhydrus Sharp）的唯一物种，包括对头壳、头部附肢、腿、末腹节和尾突的详细形态测量和刚毛序分析。该物种的幼虫特征是没有初级孔ABc，这一特征与所有其他已知的沼梭甲科幼虫相同，因此可能是该族的一个潜在共衍征。合成胡氏龙虱的三龄幼虫可通过以下特征组合与所有其他已知沼梭甲科属的幼虫区分开来：体型较大，下颌孔MNa相对于孔MNb明显位于更远端位置，以及在跗节I背面、所有跗节的后腹面和尾突上有次生刚毛。一龄幼虫则可通过以下特征来区分：有一条枕缝、初级孔PAk、触角第3节腹顶端有一个小刺，以及中胸和后胸有一条前横隆线。
