Erythrolamprus oligolepis

distribution

Distribution. Endemic to Brazil (Plt. 380 A). In Brazil, widespread in Amazonia, south of the Amazon River (Plt. 380 A), at low elevations (Plt. 380 B). Previous map and taxonomy in Ascenso et al. (2019). Observed in the field in forest (Cunha and Nascimento, 1993).

Atlas of Brazilian Snakes: Verified Point-Locality Maps to Mitigate the Wallacean Shortfall in a Megadiverse Snake Fauna

description

Liophis oligolepis — Cunha & Nascimento 1993; Ofídios da Amazônia: 73. Erythrolamprus oligolepis — Grazziotin et al. 2012; Cladistics. 1: 21. Liophis oligolepis — Wallach et al. 2014; Snakes of the world: 391.

Taxonomic revision of the Erythrolamprus reginae species group, with description of a new species from Guiana Shield (Serpentes: Xenodontinae)

description

Redescription of the holotype. Body cylindrical; SVL 247 mm, CL 73 mm (29.6 % SVL); internasals two, barely wider than long; prefrontals two, twice longer than wide, in contact with supraoculars, preocular, loreal and postnasal; frontal pentagonal; parietals two; supralabials eight, fourth to fifth contacting eye; supraoculars longer than wide; nasal in contact with first two supralabials, internasals, prefrontals, loreal, and rostral; loreal tetragonal, higher than long, contacting second and third supralabials, postnasal, prefrontals, and preocular; rostral barely triangular, wider than high, visible in dorsal view; preocular contacting supraocular, prefrontal, nasal, third and fourth supralabials; postoculars two, upper postocular higher than lower; temporals 1 + 2, anterior longer than upper posterior temporal; symphysial triangular; infralabials 9, first pair in broad contact behind symphysial; first four pairs in contact with chinshields; smooth dorsal scale rows 15 / 15 / 15, without reduction; apical pit single; ventrals 152; subcaudals 61; cloacal plate divided. Dorsum of head dark gray to dark brown; upper edges of supralabials with a distinctive postorbital stripe; later

Taxonomic revision of the Erythrolamprus reginae species group, with description of a new species from Guiana Shield (Serpentes: Xenodontinae)

diagnosis

Diagnosis. Erythrolamprus oligolepis can be distinguished from all congeners by unique combination of the following characters: (1) dorsal scales rows 15, without reduction at the midbody; (2) apical pit single; (3) ventrals 134 – 166 in females and 142 – 160 in males; (4) subcaudals 55 – 67 in females and 53 – 64 in males; (5) dorsal coloration of the head olive green, extending to anterior third of the body, gradually changing to grayish-brown at midbody; (6) upper edges of supralabials with distinctive dark postorbital stripe; (7) belly creamish-white usually without black spots, except for the specimens of the west margin of the Amazon River, which present a slight pigmentation; (8) lateral black spots extending from anterior third of the body, between 2 – 3 th dorsal scale rows, to form a lateral stripe, which extends to the end of the tail; (9) subcaudals without dots or spots; (10) intrasulcal region of hemipenial body with spines slightly elongated, arranged in a row extending from distal region of lobes to the level of bifurcation of sulcus spermaticus; (11) medial region of asulcate face of hemipenial body ornamented with spinules homegeneously distributed; (12) sulcus sp

Taxonomic revision of the Erythrolamprus reginae species group, with description of a new species from Guiana Shield (Serpentes: Xenodontinae)