Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA .
USDA Forest Service, Rocky Mountain Research Station, 1648 S 7th Ave, Bozeman, Montana 59717, USA.
Zootaxa. 2021 Nov 26;5072(1):43-52. doi: 10.11646/zootaxa.5072.1.5.
A tylenchid nematode parasite of a male long-legged fly, Tachytrechus sanus Osten Sacken (Diptera: Dolichopodidae) from Montana, USA is described as Parasitylenchus myiophagus n. sp. (Nematoda: Parasitylenchidae). The new species is characterized by the presence of an extremely long first generation female and numerous short and wide second generation males and females produced in enclosed clusters in the hosts body cavity. Both generation female nematodes are ovoviviparous, with short stylets lacking knobs and simple tails lacking spikes, palps or mucrons. The second generation males have paired, separate spicules, short stylets, and a bursa but no visible gubernaculum. The fly host shows evidence of demasculinization, which is attributed to nematode parasitism. The gonads of the second generation adults are infected with a microsporidium (Microsporidia), which is a new host record for tylenchid nematodes. A tylenchid-infected Baltic amber dolichopodid shows that associations between these two organisms extend back at least to the Eocene.
一种寄生在雄性长腿蝇（Tachytrechus sanus Osten Sacken）（双翅目：长足虻科）体内的线虫寄生虫，来自美国蒙大拿州，被描述为寄生线虫属的寄生线虫（线虫：寄生科）。新物种的特征是存在极其长的第一代雌性和许多短而宽的第二代雄性和雌性，它们在宿主体腔内封闭的簇中产生。两代雌性线虫均为卵胎生，具有短的口针，缺乏节结，简单的尾部缺乏刺、刚毛或角状突。第二代雄性具有成对的、分开的刺，短的口针和一个囊，但没有可见的生殖带。蝇宿主表现出去雄性化的迹象，这归因于线虫寄生。第二代成虫的性腺被一种微孢子虫（微孢子虫）感染，这是线虫寄生的一个新宿主记录。一块寄生线虫的波罗的海琥珀长足虻显示，这两种生物之间的联系至少可以追溯到始新世。
