Neotripyla vulgaris gen. n., sp. n. and Semitobrilus andrassyi sp. n. (Nematoda, Triplonchida) from freshwater bodies of Vietnam Author Gagarin, Vladimir G. Author Gusakov, Vladimir A. text Zootaxa 2013 3716 4 565 576 journal article 43023 10.11646/zootaxa.3716.4.4 9d75fb60-4ee0-42bb-8edb-e41b41e423ca 1175-5326 221755 18AF3DCA-7E90-4A00-8E0B-E92DD94F1461 Key to valid species of the genus Semitobrilus 1. 10 supplement; vulva postequatorial (V = 61–64 %)............................................. S. parapellucidus – 6–8 supplements; vulva praequatorial or equatorial (V = 38–55 %).............................................. 2 2. Crystalloids absent; length of outer labial setae is equal 60 % of labial region width........................ S. pellucidus – Crystalloids present; length of outer labial setae is equal 23–40 % of labial region width............................. 3 3. Spicules 102–122 µm long....................................................................... S. ebsaryi – Spicules less 100 µm long............................................................................... 4 4. ♂♂ L = 1.60–1.72 mm ; outer labial setae 4.0–6.0 µm long, 23–25 % of labial region width........... S. closlongicaudatus – ♂♂ L = 1.96 mm or more; outer labial setae more 9 µm long, more 25 % of labial region width....................... 5 5. Spicules 65 µm long, keel-like projection at distal portion absent........................................ S. gagarini – Spicules 71–80 µm long, keel-like projection at distal portion present.............................. S. andrassyi sp. n.