2507-9 Omaeda, Fukaya-shi, Saitama Prefecture, 369-1246 Japan. .
Zootaxa. 2021 Jun 24;4991(2):271-294. doi: 10.11646/zootaxa.4991.2.3.
The Japanese members of the proturan genus Gracilentulus comprise five species: G. aokii Imadaté, G. chichibuensis Nakamura, G. macrotarsus sp. nov., G. microtrichus sp. nov., and G. europaeus Szeptycki. In the present study, the new Gracilentulus species are described while G. europaeus is described based on Japanese specimens. Gracilentulus europaeus belongs to the "gracilis" group, which was recorded in Japan for the first time herein. Supplementary notes are provided on G. aokii and G. chichibuensis. A key to the species that lack sensillum b' on the foretarsus is also provided.
日本原铗属 Gracilentulus 包括五个物种：越后铗锹形虫 Gracilentulus aokii Imadaté、秩父铗锹形虫 Gracilentulus chichibuensis Nakamura、长粗铗锹形虫 Gracilentulus macrotarsus sp. nov.、细小铗锹形虫 Gracilentulus microtrichus sp. nov. 和欧洲铗锹形虫 Gracilentulus europaeus Szeptycki。在本研究中，新的 Gracilentulus 物种被描述，而欧洲铗锹形虫则基于日本标本进行描述。欧洲铗锹形虫属于“gracilis”组，这是该组在日本的首次记录。对越后铗锹形虫和秩父铗锹形虫也提供了补充说明。还提供了一个缺乏 foretarsus 上的 sensillum b' 的物种的关键特征。
