Toxicocalamus nigrescens KRAUS, 2017
Can you confirm these amateur observations of Toxicocalamus nigrescens?
Toxicocalamus nigrescens
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| Higher Taxa | Elapidae (Hydrophiinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | |
| Synonym | Toxicocalamus nigrescens KRAUS 2017 |
| Distribution | Papua New Guinea (Milne Bay Province) Type locality: S slope Oya Waka, 9.4562°S, 150.5596°E (WGS84), 980 m elevation, Fergusson Island, Milne Bay Province, Papua New Guinea |
| Reproduction | |
| Types | Holotype: BPBM 16545 (field tag FK 6388), collected by P. Robert on 10 September 2002. Paratype: BPBM 16544. Papua New Guinea: Milne Bay Province: Fergusson Island: Basima, 9.4683°S, 150.8315°E, 0–10 m elevation. |
| Diagnosis | Diagnosis: A moderately sized species of Toxicocalamus having 15-15-15 scale rows, 182–193 ventrals, 35–42 paired subcaudals, preocular unfused with prefrontal, separated from internasal by prefrontal, in contact with nasal; prefrontal in contact with nasal; frontal unfused with supraoculars; internasals unfused; 1 postocular; 1–2 anterior temporals, 2 posterior temporals, unfused with supralabials; 6 supralabials, second in contact with nasal, excluding contact between third supralabial and nasal; divided anal plate; relatively long snout (adult EN/IN = 1.8); uniformly dark gray-brown to charcoal-gray dorsum; and ventrum changing ontogenetically from uniformly pale gray to gray with dark-gray bands across each ventral. The new species differs from Toxicocalamus holopelturus in having divided (vs. entire) subcaudals; from Toxicocalamus buergersi, T. longissimus, T. mintoni, Toxicocalamus misimae, Toxicocalamus preussi, and Toxicocalamus stanleyanus in having the preocular separate from (vs. fused to) the prefrontal; from T. pachysomus by its slender habitus (vs. robust in T. pachysomus) and in having the internasal and prefrontal not in contact but separated by contact of the nasal with the prefrontal (vs. internasal and prefrontal in contact in T. pachysomus); and from Toxicocalamus ernstmayri, Toxicocalamus grandis, and Toxicocalamus spilolepidotus in its uniformly dark-gray dorsal color (vs. yellow-brown spotted with dark brown in T. ernstmayri, dark brown with whitish blotches in T. grandis, black with each scale containing a pale-yellow spot in T. spilolepidotus). Toxicocalamus nigrescens is most similar to T. loriae but differs from that species in having adult size larger (adult SVL = 635 mm and 69.5 g vs. 348–446 mm, average 399 mm; and 11.5–32.7 g, average 22.9 g, in T. loriae); relatively longer snout (adult EN/ IN = 1.0–1.1 in T. loriae); dorsum dark charcoal gray (vs. paler gray in T. loriae, Fig. 1A vs. Fig. 1B); ventrum banded with dark gray (vs. uniformly bright lemon yellow in adult T. loriae); subcaudals uniformly charcoal gray (vs. lemon yellow margined in gray in T. loriae); and supralabials mostly gray suffused over pale yellow-white (vs. lower half or two-thirds of supralabials bright lemon yellow in T. loriae, Fig. 1A vs. Fig. 1B). (Kraus 2017) |
| Comment | Habitat: primary foothill rain forest with a moderately tall canopy reaching ~30 m and a fairly dense understory. The area had sparse moss development on the ground. |
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