|Diagnosis||Diagnosis (genus): presence of the choanal process on the palatine, oviparity, large scales on the head and smooth dorsal scales (Zug et al., 2001; Orlov et al., 2002; Mallow et al., 2003; Orlov et al., 2013, Snetkov & Orlov 2017).|
DIAGNOSIS. No sensory pit between nostril and eye; body cylindrical; head flattened, above covered with large, symmetrical shields; nostril large, in single completely differentiated nasal; loreal shield present, small; 2 pre- and 2 postoculars; eye with vertically elliptic pupil; scales smooth, in 17 longitudinal rows at midbody; ventrals 180–18; subcaudals 42–53, mostly paired, occasionally anterior shields undivided; blackish above, scales often edged with gray, 14–15 narrow white or pinkish crossbands, sometimes interrupted middorsally, or alternating with one another laterally; head yellow with a pair of dark brown to black stripes of somewhat irregular width extending from prefrontals to the black color on the neck. Total length males 25 mm,•= females 820; tail length males 100 mm, females 80 mm.
Diagnosis. Viperid snake of medium-size of genus Azemiops, up to 700 mm in body length with a tail. The head is well demarcated from the body by neck interception, noticeably flattened, covered with symmetrical shields. Head has a trapezoidal shape with slightly rounded short snout. Nostril is located in a single nasal; loreal present; eye relatively small, with vertical pupil. The body is nearly round in cross-section, slightly flat- tened dorso-ventrally, ventrals rounded. Scales smooth, in 13 – 17 rows around the middle of the body. Tail short; subcaudals in two rows. Ventrals 16 – 180; anal entire; subcaudals 41 – 44 pairs. Upper surface of head (from the prefrontals) black, with a yellow median line. Pterygoideum with 11 teeth. Angulare very small, shorter than spleniale and much shorter than dentale. Dentale with 13 – 14 teeth. Quadratum long, directed downward and backward, and articulates with pterygoideum. 167 – 17 trunk vertebrae, 45 – 4 caudal vertebrae. Parapophyses without long ventral processes. Hypopophyses developed on all trunk vertebrae, they are much shorter than the spinous processes. Parapophyses without long ventral processes. A more detailed description is based on the specimen ZISP 25868, female. See Orlov et al. 2013:116 for details.
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