| Autor: |
Ren, Jin-Long, Wang, Kai, Nguyen, Tao Thien, Hoang, Chung Van, Zhong, Guang-Hui, Jiang, Ke, Guo, Peng, Li, Jia-Tang |
| Rok vydání: |
2018 |
| Předmět: |
|
| DOI: |
10.5281/zenodo.5952078 |
| Popis: |
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 |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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