|Montane Trinket Snake (Coelognathus helena monticollaris)|
Coelognathus is a genus of 7 ratsnakes from South and South East Asia that were formerly assigned to the genus Elaphe. Based on morphological evidence and protein similarities, in 2001 Helfenberger re-validated the name Coelognathus that had originally been proposed by Leopold Fitzinger in 1843. The distinction between Coelognathus and Elaphe was further supported by mitochondrial DNA sequence and additional morphological evidence in 2005.
The following species are recognized as being valid:
- Coelognathus enganensis (Vinciguerra, 1892)
- Coelognathus erythrurus (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854) – Philippine rat snake
- Coelognathus flavolineatus (Schlegel, 1837) – yellow-striped ratsnake
- Coelognathus helena (Daudin, 1803) – trinket snake
- Coelognathus philippinus (Griffin, 1909) – reddish rat snake
- Coelognathus radiatus (F. Boie, 1827) – copperhead ratsnake
- Coelognathus subradiatus (Schlegel, 1837) - Indonesian ratsnake
- Helfenberger N. (2001). "Phylogenetic relationships of Old World ratsnakes based on visceral organ topography, osteology, and allozyme variation". Russian Journal of Herpetology. 8: 1–62.
- Utiger U, Schätti B, Helfenberger N (2005). "The Oriental colubrine genus Coelognathus Fitzinger, 1843, and classification of Old and New World racers and ratsnakes (Reptilia, Squamata, Colubridae, Colubrinae)" (PDF). Russian Journal of Herpetology. 12 (1): 32–53.
- "Coelognathus ". The Reptile Database. www.reptile-database.org.
- Fitzinger L. 1843. Systema Reptilium, Fasciculus Primus, Amblyglossae. Vienna: Braumüller & Seidel. 106 pp. + indices. (Coelognathus, new genus, p. 26). (in Latin).
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