Catesby's Snail-Eater

description

Description and variation (Table 1). Smooth dorsal scales in 13 rows without reduction (n = 386), the vertebral row moderately to broadly enlarged. Ventrals 160 – 220 (n = 140) in males; and 160 – 200 (n = 120) in female. Subcaudals divided: 70 – 120 (n = 113) in males; and 60 – 100 (n = 126) in females. Cloacal plate single. Snout-vent length 177 – 598 mm (= 414.9; SD = 82.8; n = 212) in males, and 210 – 560 mm (= 399.5; SD = 80.3; n = 211) in females. Tail length 72 – 221 mm (= 158.9; SD = 33.9; n = 205) in males, and 74 – 221 mm (= 143; SD = 27.6; n = 194) in females. Head length 7.7 – 15.1 mm (= 1.3; SD = 1.3; n = 212) in males, and 7.7 – 16.5 mm (= 11.3; SD = 1.4; n = 210) in females. Rostral longer than high. Nasal single. Frontal length 2.7 – 5.0 mm (= 3.7; SD = 0.4; n = 210) in males, and 1.4 – 4.7 (= 3.5; SD = 0.4; n = 209) in females. Eye diameter 1.8 – 4.3 mm (= 2.7; SD = 0.3; n = 209) in males, and 1.9 – 3.4 mm (= 2.5; SD = 0.2; n = 210) in females. Loreal not contacting the orbit. Two preoculars (n = 386, but also can be three (n = 14) or one (n = 12). Two postoculars (n = 338), but also can be one (n = 57) or three (n = 24). One anterior temporal (n = 342) or two (n =

Morphological variation and systematics of Dipsas catesbyi (Sentzen, 1796) and Dipsas pavonina Schlegel, 1837 (Serpentes: Dipsadinae)

description

Sibynomorphus catesbeji — Barbour & Noble, 1920: 620 Sibynomorphus catesbyi — Amaral, 1926: 8 Sibynomorphus catesbyei — Amaral, 1929: 196 Dipsas catesbyi — Beebe, 1946: 24

Morphological variation and systematics of Dipsas catesbyi (Sentzen, 1796) and Dipsas pavonina Schlegel, 1837 (Serpentes: Dipsadinae)

diagnosis

Diagnosis. Dipsas catesbyi differs from the others species of the genus by the following combination of characters: coloration pattern with rounded spots on the body and tail that narrow the vertebral region; top of head black; belly white; dorsal scales in 13 rows; two prefrontals; 160 – 220 ventrals; and 60 – 120 subcaudals. Distinguished from D. pavonina by: loreal present, not entering the orbit; 2 preoculars; 1 or 2 postoculars; hemipenis lightly bilobed with cylindrical body, lightly compressed; little distinction head of the remaining portion of the body and the antero-posterior shortening of the head absent; postorbital lobe of Harder's gland visible between levator anguli oris and adductor mandibulae externus superficialis muscles and extending until the posterior extremity of the infralabial gland.

Morphological variation and systematics of Dipsas catesbyi (Sentzen, 1796) and Dipsas pavonina Schlegel, 1837 (Serpentes: Dipsadinae)

Dipsas catesbyi

Dipsas catesbyi (N = 483) BRAZIL: Acre: Tarauacá: IBSP 18521; Amazonas: IBSP 33368; Amanã: INPA 9523; INPA 11128; Benjamim Constant: IBSP, 17209; Beruri: MZUSP 5773; Borax: MNRJ 1469; Borba: MNRJ 3009; Iauaretê: MNRJ 10852; Manaus: MZUSP 8200; Reserva Ducke: INPA 10416; MZUSP 7641; Maraã: MPEG 17868; MPEG 18022; Mato Grosso: MNRJ 337; Nova Olinda: MZUSP 5234; Presidente Figueiredo: MPEG 17567; Reserva INPA-WWF: MZUSP 8391; Rio Ituxi: MPEG 20329; Rio Javari: MNRJ 683; MNRJ 684; MNRJ 685; Tefé: IBSP 15058; IBSP 15059; IBSP15092; MPEG 18230; Uarini: Mamirauá: MPEG 18839; Uaupés: IBSP 22148; Amapá: Duas Bocas: IBSP 25393; Rio Tracajatuba: IBSP 25434; IBSP 25394; IBSP 25395; MPEG 60; Bahia: Feira de Santana: IBSP 3214; Ilhéus: IBSP 41332; IBSP 58384; Itabuna: MZUSP 1288; Porto Seguro: IBSP 57215; Reserva Biológica Pau Brasil: MZUSP 9027; Goiás: Rio Araguaia: UHE Santa Izabel: MPEG 17193; Maranhão: Nova Vida: MPEG 10323; MPEG 12100; MPEG 12277; MPEG 12278; MPEG 12713; MPEG 12714; MPEG 12715; MPEG 13731; MPEG 14430; MPEG 14997; MPEG 16236; Santa Inês: MPEG 10871; Santa Luzia do Paruá: MPEG 14241; MPEG 15049; Rio Turiaçu: MPEG 16423; Mato Grosso: Cacéres: IBSP 37381; Juína: MNRJ 212; Po

Morphological variation and systematics of Dipsas catesbyi (Sentzen, 1796) and Dipsas pavonina Schlegel, 1837 (Serpentes: Dipsadinae)