Tripyla

Zhao, Zeng Qi, 2009, New Zealand species of the genus Tripyla Bastian, 1865 (Nematoda: Triplonchida: Tripylidae). I: A new species, a new record and key to long-tailed species, Zootaxa 2291, pp. 35-50 : 47-48

Key for identification of species of Tripyla from the long-tailed group (c <5) (by females)

1. Tail length shorter than 430µm..................................................................................................................................... 2

– Tail length longer than 480 µm..................................................................................................................................... 4

2. The six long cephalic setae (2–4 µm) are less than ¼ of a head diameter......................................................... T. tenuis

– The six long cephalic setae (5–8 µm) are about ¼ of a head diameter......................................................................... 3

3. V = 46–53.................................................................................................................................................. T. filicaudata

– V = 44–45....................................................................................................................................................... T. bioblitz

4. Pharynx longer than 450 µm....................................................................................................................... T. dybowskii

– Pharynx shorter than 420 µm........................................................................................................................................ 5

5. Pharynx more muscular in 1/3rd of its posterior part, tail filiform............................................................................... 6

– Pharynx evenly muscular, tail not filiform ................................................................................................................... 7

6. C’ = 20; body length = 2.0– 2.7 mm.................................................................................................................. T. italica

– C’ = 8-11; body length = 1.8–1.9 mm................................................................................................... T. scandinavica

7. The six long cephalic setae (3–5 µm) ca ¼ of a head diameter............................................................... T. subterranea

– The six long cephalic setae (more than 15 µm) ca 1/3 of a head diameter........................................... T. longicaudata