Two-headed Sipo

diagnosis

Diagnosis. Chironius bicarinatus is distinguished from all congeners by the following unique combination of morphological characters: (i) dorsal scale rows 12 / 12 / 10; (ii) cloacal plate divided; (iii) dorsal scale rows keeled usually two; (iv) ventrals 147 - 170 in females, 145 - 165 in males; (v) subcaudals 130 - 157 in females, 125 - 154 in males; (vi) apical pits often present only on the cervical region; (vii) three supralabials contacting orbit; (viii) temporal formula usually 1 + 2; (ix) after preservation, uniform olive, grayish olive or bluish dorsum with a light vertebral stripe; (x) after preservation, labials predominantly yellowish, except for the last two or three supralabials, which may present the same color of dorsal series or postocular stripe; gular region, first third of belly, and subcaudals yellowish; remainder of the belly yellowish or bluish; (xi) a medially positioned black zig-zag line between subcaudals, gradually fading to the tip of the tail; outer margins with a black outline; (xii) hemipenial body generally ornamented with papillate calyces gradually replaced by smooth calyces toward the apex; (xiii) hemipenial body with each longitudinal row presen

Revision of the Chironius bicarinatus complex (Serpentes: Colubridae): Redefined species boundaries and description of a new species

distribution

Distribution (Fig. 8). Chironius bicarinatus is distributed in the Ombrophilous Dense and Semideciduous Forests along the coast, from the Sao Francisco River, state of Sergipe, Northeastern Brazil (northernmost record in the municipality of Capela; 10 ° 32 ′ S, 37 ° 03 ′ W), to the Serra do Tabuleiro, state of Santa Catarina, Southern Brazil (southernmost record in the municipality of Florianopolis; 27 ° 35 ′ 38.5 ″ S, 48 ° 32 ′ 54.0 ″ W) between sea level to ~ 930 m a. s. l ..

Revision of the Chironius bicarinatus complex (Serpentes: Colubridae): Redefined species boundaries and description of a new species

distribution

Distribution. Known from Argentina, Brazil, Paraguay, and Uruguay (Plt. 116 A). In Brazil, widespread in Atlantic Forest, with marginal records in the Pampas Grassland and isolated records in Cerrado and Caatinga (Plt. 116 A), at low to high elevations (Plt. 116 B). Doubtful records in Bolivia (Embert, 2008) not mapped. Previous maps and taxonomy in Dixon et al. (1993). Observed in the field in forest (Dixon et al., 1993; Silva Jr. and Sites, 1995; Argôlo, 2004; Loebmann and Haddad, 2010).

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

materials_examined

Type locality. Lake near Rio Jucu, Vila Velha, state of Espírito Santo, Brazil.

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