Kritsky Delane C, Boeger Walter A, Patella Luciana
Department of Community Public Health, College of Health Professions, Campus Box 8090, Idaho State University, Pocatello, Idaho 83209, U.S.A..
Zootaxa. 2020 Feb 11;4732(1):zootaxa.4732.1.8. doi: 10.11646/zootaxa.4732.1.8.
Atopogyrodactylus n. gen. (Gyrodactylidae) is proposed for Atopogyrodactylus praecipuus n. sp. (type species by monotypy), a protandrous and oviparous gyrodactylid from the external surfaces of an unidentified bristlenose catfish Ancistrus sp. (Siluriformes: Loricariidae) from the head waters of the Rio Candeias in the State of Rondônia, Brazil. The new genus contains species morphologically similar to those of Nothogyrodactylus Kritsky Boeger, 1991 as shown by members of both genera having accessory copulatory sclerites associated with the male copulatory organ (MCO). Atopogyrodactylus differs from Nothogyrodactylus by its species lacking haptoral bars and having a sclerotized haptoral plate overlying the ventral anchors. The new species most closely resembles Nothogyrodactylus amazonicus Kritsky Boeger, 1991 by possessing a flared proximal filament on the egg and a single morphologically similar accessory copulatory sclerite associated with an allantoid MCO.
拟将Atopogyrodactylus作为新属（三代虫科），Atopogyrodactylus praecipuus作为新种（单型模式种）。该新种三代虫为雄性先熟且卵生，寄生于巴西朗多尼亚州坎代亚斯河源头一种未鉴定的硬唇鲶属Ancistrus sp.（鲇形目：甲鲶科）体表外表面。新属包含的物种在形态上与1991年Kritsky和Boeger建立的Nothogyrodactylus属物种相似，两属成员的雄性交配器官（MCO）均有附属交配骨片。Atopogyrodactylus属与Nothogyrodactylus属的区别在于，其物种没有交接器棒，且在腹钩上方有一块硬化的交接器板。新种与1991年Kritsky和Boeger描述的Nothogyrodactylus amazonicus最为相似，其卵上有一个向外展开的近端丝，且与类尿囊状MCO相关联有一个形态相似的单一附属交配骨片。
