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Ahaetulla isabellina (WALL, 1910)

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Higher TaxaColubridae, Ahaetuliinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common Names 
SynonymDryophis mycterizans isabellinus WALL 1910: 229, 524
Ahaetulla nasutus — MALHOTRA & DAVIS 1991: 159
Ahaetulla nasuta isabellina — DEEPAK et al. 2019
Ahaetulla isabellina — MALLIK et al. 2020: 27
Ahaetulla isabellina — DAVID et al. 2022 
DistributionIndia (S Karnataka)

Type locality: Paralai, near Valparai (10.335 N, 76.952 E, 1100 msl; original type locality); neotype locality: Oru Komban hills (10.4077 N, 76.7177 E, 1077 msl), in Parambikulam plateau of Anaimalai Hill complex, Southern Western Ghats, Peninsular India. The neotype locality (Parambikulam) is close (< 30 km) to the original type locality.  
Reproduction 
TypesNeotype: BNHS 3584 (ex. CESS182), designated by Mallik et al. 2020. 
DiagnosisDiagnosis: A species of Ahaetulla having short rostral appendage (vs. long in A. oxyrhyncha comb. nov.; A. anomala, A. laudankia), possessing a white ventrolateral stripe (vs. absent in A. pulverulenta, A. sahyadrensis nom. nov.); absence of a loreal scale (vs. present in A. dispar and A. travancorica sp. nov.); 7 pre-diastemal and 9 post-diastemal maxillary teeth (vs. 6 and 7 in A. malabarica sp. nov., vs. 6 and 11 in A. farnsworthi sp. nov.,vs. 6 and 8 in A. borealis sp. nov., vs. 7 and 7 in A. oxyrhyncha comb. nov.); we have not found any further morphological difference from other closely related lineages (A. malabarica sp. nov., A. farnsworthi sp. nov., and A. borealis sp. nov.) (Fig. 3 & 13, Table 2, Mallik et al. 2020: 28). 
CommentDiet: lizards and other vertebrates (by implication)

Synonymy: SMITH 1943 synonymized Dryophis mycterizans isabellinus with A. nasuta but the former was revalidated by Mallik et al. 2020.

Distribution: See map in Mallik et al. 2020: 14 (Fig. 4).

Habitat: fully arboreal (Harrington et al. 2018, by implication).

Types: This species was described based on a single specimen that cannot be traced 
EtymologyNamed in allusion to the isabelline yellow colouration of the dorsal body of the original name-bearing type in live condition (see Wall 1910). 
References
  • David, Patrick; Bartoz Nadolski, Sumaithangi Rajagopalan Ganesh, Omkar Dilip Adhikari, Achyuthan N. Srikanthan 2022. A Nomenclatural Review of Ahaetulla nasuta (Lacépède, 1789): resurrection of Ahaetulla fusca (Duméril, Bibron et Duméril, 1854) for the populations of the Indochinese Region (Reptilia, Squamata, Colubridae). Russian Journal of Herpetology 29 (1): 19–34. - get paper here
  • Deepak, V., Narayanan, S., Sarkar, V., Dutta, S. K. & Mohapatra, P. P. 2019. A new species of Ahaetulla Link, 1807 (Serpentes: Colubridae: Ahaetullinae) from India. J. Nat. Hist. 53: 497–516 - get paper here
  • Harrington, Sean M; Jordyn M de Haan, Lindsey Shapiro, Sara Ruane 2018. Habits and characteristics of arboreal snakes worldwide: arboreality constrains body size but does not affect lineage diversification. Biological Journal of the Linnean Society 125 (1): 61–71 - get paper here
  • MALLIK, A. K., SRIKANTHAN, A. N., PAL, S. P., D’SOUZA, P. M., SHANKER, K., & GANESH, S. R. 2020. Disentangling vines: a study of morphological crypsis and genetic divergence in vine snakes (Squamata: Colubridae: Ahaetulla) with the description of five new species from Peninsular India. Zootaxa 4874 (1): 1-62 - get paper here
  • Smith, M.A. 1943. The Fauna of British India, Ceylon and Burma, Including the Whole of the Indo-Chinese Sub-Region. Reptilia and Amphibia. 3 (Serpentes). Taylor and Francis, London. 583 pp.
  • Wall,F. 1910. Remarks on the varieties and distribution of the common Green Whip Snake (Dryophis mycterizans). J. Bombay nat. Hist. Soc. 20: 229 - get paper here
 
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