Gerrhopilus depressiceps (STERNFELD, 1913)
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Gerrhopilus depressiceps
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| Higher Taxa | Gerrhopilidae, Typhlopoidea, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Lowland beaked blindsnake |
| Synonym | Typhlops depressiceps STERNFELD 1913: 384 Typhlops depressiceps — DE ROOIJ 1917: 9 Typhlops monochrus VOGT 1932: 293 Typhlops monochrous — LOVERIDGE 1948: 320 (nomen emendatum) Typhlops depressiceps — MCDIARMID, CAMPBELL & TOURÉ 1999: 98 Gerrhopilus depressiceps — VIDAL et al. 2010 Gerrhopilus depressiceps — WALLACH et al. 2014: 308 |
| Distribution | Papua New Guinea, New Britain [HR 32: 61] Type locality: “Neuguinea” (STERNFELD 1913) Type locality: “along Sepik River, New Guinea” (VOGT 1932) |
| Reproduction | oviparous |
| Types | Holotype: ZMB 23986, possibly lost (Bauer et al. 2002) |
| Diagnosis | Diagnosis: This species belongs to Gerrhopilus based on the presence of head glands in the centers of the anterior head shields in addition to their anterior margins (McDowell 1974; Wallach 1996b). A relatively robust (adult L/M = 70) species of Gerrhopilus having the unique combination of a rostrate snout with a transverse keel on the ventral margin of the rostral that extends ventral to the rictus, angle of pre-oral snout in lateral aspect horizontal, distinct pupil in the eye, preocular barely covers the anterior margin of the eye in lateral view, longitudinal scale rows 24/22/20, transverse scale rows posterior to the rostral 649–664, supralabial imbrication pattern T-V, subocular scale single, presubocular scale absent, posterior margin of rostral shallowly concave, prefrontals and supraoculars subequal in size to frontal and parietals and interparietal, subcaudal scales 27–30, L/W ratio 57–67, and tail spine oriented ventrally at an angle of 70 ̊ to axis of anteroventral surface of that terminal scale (and, hence, to body axis). Refer to Table 1 for additional diagnostic qualitative and quantitative features. Comparisons. Gerrhopilus depressiceps may be distinguished from all other members of this genus except G. mcdowelli in having a transverse keel on the ventral margin of the rostral, which gives the snout a beaked appearance in lateral aspect, and in having a posterior reduction of four longitudinal scale rows from head to vent. From that species G. depressiceps is distinct in its greater number of mid-dorsal scale rows (649–664 vs. 431–464 in G. mcdowelli); greater length (188–323 mm vs. 94–199 in G. mcdowelli); narrower body (L/W = 57–67 in G. depressiceps vs. 44–53 in G. mcdowelli); large, transversely expanded apical spine (vs. spine small and needle-like in G. mcdowelli); pre-oral snout oriented horizontally (vs. inclined at 30° from horizontal in G. mcdowelli); and rostral keel pointing directly downward (vs. anteroventrally in G. mcdowelli). |
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