Diagnosis | Diagnosis (genus). Species of Rhinotyphlops have (1) eye, distinct, (2) snout, beaked (rarely rounded), (3) head scale arrangement, non-circular, (4) frontorostral, absent, (5) nasal, completely or incompletely divided, (6) nasal suture origin, 2nd supralabial (sometimes 1st supralabial), (7) suboculars or subpreoculars, absent (sometimes present), (8) postoculars, 4–6 (rarely 2–3; average 4.21), (9) preocular-labial contact, supralabials 2 & 3 (sometimes 2nd or 2–4), (10) midbody scale rows, 22–34 (average, 25.0), (11) scale row reduction, present (sometimes absent), (12) total scale rows, 311–586 (average, 425), (13) caudals, 14–15 (average, 14.5), (14) maximum total length, 220– 455 (average, 323) mm, (15) total length/midbody diameter, 27–77 (average, 48.9), (16) total length/tail length, 50.2–78.5 (average, 65.0), (17) dorsal color, brown (sometimes yellowish, greenish, or reddish), (18) ventral color, white or yellowish (sometimes brownish or black), (19) dorsum darker than venter, (20) overall, either patternless or with longitudinal lines (Tables 1–2); molecular phylogenetic support (Fig. 1 in HEDGES et al. 2014). From Letheobia, Rhinotyphlops is distinguished by having a distinct eye (versus indistinct), lacking subocular scales (versus present), having a higher average number of midbody scale rows (25.0 versus 22.3), having a higher average number of caudals (14.5 versus 11.1), and having a dark (versus pale) dorsum. From Afrotyphlops, Rhinotyphlops is distinguished by having more caudals (14.5 versus 9.6) and smaller size (323 versus 481 mm average TL). [HEDGES et al. 2014: 31] For an alternative diagnosis see PYRON & WALLACH 2014: 48. |
References |
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