Trimerodytes balteatus COPE, 1895
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Trimerodytes balteatus
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| Higher Taxa | Colubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Hainan Mountain Keelback Chinese: 横纹环游蛇 |
| Synonym | Trimerodytes balteatus COPE 1895: 426 Opisthotropis balteata POPE 1935 Liparophis Bedoti PERACCA 1904: 664 Opisthotropis multicinctata FAN 1931: 82 Opisthotropis multicincta FAN 1931 (fide ZHAO & ADLER 1993) Trimerodytes balteatus — MELL 1931 [1929] Opisthotropis balteatus — SMITH 1943: 331 Opisthotropis balteatus — BROWN & LEVITON 1961 Opisthotropis balteata — ZIEGLER et al. 2008 Opisthotropis balteata — WALLACH et al. 2014: 508 Trimerodytes balteatus — REN et al. 2019: 117 Trimerodytes balteata — FRANCIS 2021 |
| Distribution | N Vietnam, China (Hainan, Guangdong, Guangxi, Hunan, Hong Kong) Type locality: Hainan Island, China. |
| Reproduction | oviparous. |
| Types | Holotype: ANSP 11435; MCZ ? |
| Diagnosis | Diagnosis Trimerodytes balteatus can be diagnosed from other morphologically similar species by a combination of the following characters: (1) body cylindrical, TL 604–1 021 mm; (2) tail relatively moderate, TaL/TL 0.15–0.24; (3) head moderately distinct from neck; (4) nostrils directed dorsolaterally; (5) eyes moderate, EW/ SoL 0.86–1.38; (6) maxillary teeth mostly 16–19, slightly enlarged posteriorly, without diastema; (7) dorsal scale rows 19-19-17; (8) prefrontal single, spindle-shaped; (9) supralabials 9–10, usually 4th or 5th entering orbit; (10) ventrals 187–205; (11) dorsal scales smooth anteriorly, smooth or feebly keeled at midbody, tending to be moderately keeled rear body and on tail, outer most three or four dorsal scale rows along both sides of body smooth entirely before cloaca; (12) body brownish-red or brownish-yellow, encircled by 32–54 black bands with yellow centers, 13–28 present on tail; (13) venter yellowish-beige, with annulated or alternating black bands (Figures 2A, 3D, 4, 5A–B; Tables 3–4 in Ren et al. 2019). |
| Comment | Habitat: aquatic, inhabiting flowing streams. Synonymy: partly after Zhao & Adler 1993. Diet: fishes, frogs, tadpoles, freshwater shrimp and earthworms. Behavior: nocturnal Type species: Trimerodytes balteatus COPE 1895: 426 is the type species of the genus Trimerodytes COPE 1895. Trimerodytes was resurrected from the synonymy of Opisthotropis as a senior synonym of Sinonatrix (which was synonymized with Trimerodytes by Ren et al. 2019). Comparisons (genera): Ren et al. 2019: 121 (Table 6) provide a morphological comparison of natricine genera (Opisthotropis, Paratapinophis, Isanophis, Trimerodytes balteatus, Hebius annamensis, Trachischium fuscum/guentheri, Rhabdops bicolor, Atretium yunnanensis, Pseudagkistrodon rudis multiprefrontalis). Distribution: not in Cambodia fide Ren et al. 2019. |
| Etymology | The generic nomen of Trimerodytes is a noun made of three parts: (1) the Ancient Greek τρία “tría”, meaning “three”; (2) the Ancient Greek μέρος “méros”, meaning part, component, or region; and (3) the Greek “dytēs”, meaning diver or swimmer. The generic nomen refers to the three-parted (black-yellow-black) annulated markings and the aquatic life of the type species T. balteatus. The gender of this generic name is masculine (Ren et al. 2019). The specific epithet, balteatus, is a Latin adjective that means girded or belted. The term may be used to describe the distinctive annulated markings of this species. |
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