Tripylella

Prado-Vera, Ignacio Cid Del, Ferris, Howard & Nadler, Steven A., 2016, Five new species of the genus Tripylella (Nematoda: Enoplida: Tripylidae), Zootaxa 4109 (2), pp. 198-217 : 213

Key to the species of Tripylella (see Table 3)

1. Two large teeth in the posterior stomal chamber and two subventral teeth in a smaller anterior chamber..... T. dentata sp. n. Stoma with one dorsal and two subventral teeth.............................................................. 2

2. Tail cylindrical then narrowing abruptly; outer labial setae 2.0–3.0 Μm long....................................... 3 Tail tapering evenly; outer labial setae>3 Μm long; subventral teeth anterior or posterior to dorsal tooth................. 9

3. Subventral teeth anterior to dorsal tooth.................................................................... 4 Subventral teeth posterior to dorsal tooth................................................................... 8

4. Dorsal tooth large; excretory pore absent......................................... T. subintermedia Zhao et al., 2014 Dorsal tooth small; excretory pore present or absent........................................................... 5

5. Pharynx length 141–189 Μm............................................................................. 6 Pharynx length 160–207 Μm............................................................................. 7

6. Pharynx length 141–184(161) Μm; posterior of pharynx to vulva 141–282(205) Μm; excretory pore present, 80–93(85.6) Μm behind head........................................................................... T. mexicana sp. n. Pharynx length 160–189(175) Μm; posterior of pharynx to vulva 160–238(196) Μm; excretory pore absent..................................................................................................... T. quitoensis sp. n.

7. Pharynx length 160–207(180) Μm; posterior of pharynx to vulva 132–255(191) Μm; tail length 90–128(110) Μm; excretory pore 58–86(73.8) Μm behind head........................................................ T. fatimaensis sp. n. Pharynx length 184–207(200) Μm; posterior of pharynx to vulva 212–292(258) Μm; tail length 122–160(140) Μm; excretory pore 95–110(82) Μm behind head............................................................ T. muscusi sp. n.

8. Body length 0.81–0.96 (0.87) mm; head width 18–19 Μm................................................................................................... T. intermedia ( Bütschli, 1873) Brzeski & Winiszewska.Ślipińska, 1993 Body length 0.68–0.75(0.72) mm; head width 15–16 Μm.................................. T. iucunda Andrássy, 2008 9. Body length 1.1–1.4 mm; outer labial setae 7–9 Μm long, excretory pore absent; subventral teeth anterior to dorsal tooth................................................................................... T. maiuscula Andrássy, 2006 Body length 0.86–0.98 mm; outer labial setae 3.4 Μm long; excretory pore present; subventral teeth posterior to dorsal tooth................................................................................ T. minuscula Andrássy, 2006