Natricinae
Creators: name: Ren, Jin-Long
name: Wang, Kai
name: Nguyen, Tao Thien
name: Hoang, Chung Van
name: Zhong, Guang-Hui
name: Jiang, Ke
name: Guo, Peng
name: Li, Jia-Tang
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Squamata
Natricinae

description: Key to the genera of Natricinae in China and Vietnam (modified from Zhao [2006] and Smith [1943])
1 Internasal single.............................................................................. Rhabdops
- Internasals 2–3...................................................................................... 2
2 Internasals 2–3; prefrontals 2–4; nostril valvular...................................................... Atretium
- Internasals paired; prefrontal single or paired; nostril valvular or not............................................ 3
3 Total length less than 370 mm; subcaudals 25–44................................................. Trachischium
- Total length more than 370 mm; subcaudals usually more than 44.............................................. 4
4 Head somewhat triangular shaped; temporals stongly keeled...................................... Macropisthodon
- Head not triangular shaped; temporals not keeled........................................................... 5
5 Prefrontal single or mostly single, much broader than long.................................................... 6
- Prefrontal paired, normal sized.......................................................................... 8
6 Head barely distinct from neck; maxillary teeth subequal; nostrils directed upwards...................... Opisthotropis
- Head distinct or moderately distinct from neck; maxillary teeth enlarged posteriorly; nostrils directed dorsolaterally...... 7
7 Dorsal scale rows 19 at midbody; nostrils valvular; last 3 or 4 maxillary teeth slightly enlarged............ Paratapinophis
- Dorsal scale rows 17 or 15 at midbody; nostrils not valvular; last 2 maxillary teeth moderately enlarged....... Parahelicops
8 Hemipenis forked, sulcus spermaticus of hemipenis forked or not.............................................. 9
- Hemipenis not forked, sulcus spermaticus of hemipenis not forked............................................ 11
9 Sulcus spermaticus of hemipenis not forked........................................................ Sinonatrix
- Sulcus spermaticus of hemipenis forked................................................................. 10
10 Neck with nuchal gland or not; last two maxillary teeth distinctly enlarged and curved, with diastema........ Rhabdophis
- Neck without nuchal gland; maxillary teeth gradually enlarged in a continuous series or abruptly enlarged posteriorly............................................................................................... Xenochrophis
11 Maxillary teeth gradually enlarged in a continuous series, without diastema; nostrils directed dorsolaterally......... Natrix
- Maxillary teeth gradually enlarged posteriorly or last two distinctly enlarged, often with diastema; nostrils directed more or less laterally........................................................................................ 12
12 Maxillary teeth more than 37; 2 vertical white stripes present on both preoculars and postoculars......... Amphiesmoides
- Maxillary teeth less than 37; preocular and postocular color pattern not as such................................... 13
13 Dorsal scale rows 19:19:17; internasals distinctly truncated anteriorly.......................................... 14
- Dorsal scale rows 19:19:17 or 17:17:17; internasals broad anteriorly; maxillary teeth in continuous series, gradually enlarged posteriorly in the series or the last two teeth abruptly enlarged............................................ Hebius
14 Ventrals 142–157; subcaudal 41–82.............................................................. Amphiesma - Ventrals 172–217; subcaudal 69–107............................................................ Herpetoreas
description: Published as part of Ren, Jin-Long, Wang, Kai, Nguyen, Tao Thien, Hoang, Chung Van, Zhong, Guang-Hui, Jiang, Ke, Guo, Peng & Li, Jia-Tang, 2018, Taxonomic re-evaluation of the monotypic genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) with discovery of its type species, P. chapaensis, from China, pp. 31-56 in Zootaxa 4486 (1) on pages 51-52, DOI: 10.11646/zootaxa.4486.1.2, http://zenodo.org/record/1438021