Oligodon speleoserpens PAWANGKHANANT, POYARKOV, WARD-SMITH, GRASSBY-LEWIS, SUMONTHA, KLIUKIN, IDIIATULLINA, TROFIMETS, SUWANNAPOOM & LEE, 2024
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Oligodon speleoserpens
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| Higher Taxa | Colubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Cave Kukri Snake Thai: ป่ีแก้วควนหิน (Ngu Pi Kaew Kuan Hin) |
| Synonym | Oligodon speleoserpens PAWANGKHANANT, POYARKOV, WARD-SMITH, GRASSBY-LEWIS, SUMONTHA, KLIUKIN, IDIIATULLINA, TROFIMETS, SUWANNAPOOM & LEE 2024: 364 |
| Distribution | Thailand (Satun) Type locality: entrance of Tham Le Stegodon Cave, Satun Province, Thailand (7.158315°N, 99.802631°E, 28 meters elevation). |
| Reproduction | |
| Types | Holotype. ZMMU Re-17696 (field number ISS-128), adult male collected on 20 January 2023 by Pa- rinya Pawangkhanant and Sabira S. Idiiatullina. Paratype. ZMMU Re-17697 (field number NAP-13128), adult female collected 24 September 2022 inside Tham Khao Ting Cave, Trang Province, Thailand (7.158315°N, 99.802631°E, 12 meters elevation), by Nikolay A. Poyar- kov, Nikita S. Kliukin, Chatmongkon Suwannapoom and Parinya Pawangkhanant. |
| Diagnosis | Diagnosis: O. speleoserpens sp. nov. is referred to the genus Oligodon based on the presence of enlarged blade-shaped maxillary teeth without a diastema, an elongate and subcylindrical body, and the presence of a large inflated rostral scale that blocks the internasal scales from contacting anteriorly (Wall 1923; Smith 1943; David et al. 2023). It is distinguished from all other Oligodon by the following combination of morphological characters: 1) head oblong-shaped with a truncated snout and slightly inflated rostral scale; 2) 8 maxillary teeth, with the posterior three teeth enlarged and blade-like; 3) dorsal scales in 19–17–15 rows (17–17–15 rows in one specimen); 4) reduction from 19 dorsal scale rows to 17 dorsal scale rows occurring at the 28th–30th ventral scale; 5) reduction from 17 dorsal scale rows to 15 dorsal scale rows occurring at the 100th–113th ventral scale; 6) cloacal plate entire; 7) 189–193 ventral scales (189–190 in male; 193 in female), distinctly keeled; 8) 47–54 paired subcaudal scales (47–54 in male; 48 in female); 9) 238–244 total body scales; 10) relative tail length 0.136–0.139 and subcaudal ratio 0.198–0.221; 11) 8 supralabials on either side of the head, with the fourth and fifth scales in contact with the orbit; 12) 9 infralabials on either side of the head with the first four scales in contact with the first pair of chin shields; 13) one loreal and one presubocular present; 14) 1+2 temporal scales; 15) dorsal color pattern uniform gray or grayish–brown without any markings or reticulations; 16) anterior half of ventral surface white with gray–brown irregularly shaped spots, posterior half immaculate dark gray, underside of tail splashed with white markings; 17) hemipenis bilobed with broad, awn-shaped lobes, simple sulcus spermaticus and smooth calyces. (PAWANGKHANANT et al. 2024) |
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