Omoadiphas cannula MCCRANIE & CRUZ-DÍAZ, 2010
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Omoadiphas cannula
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| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | |
| Synonym | Omoadiphas cannula MCCRANIE & CRUZ-DÍAZ 2010 Omoadiphas cannula — WALLACH et al. 2014: 505 |
| Distribution | Honduras (Sierra de Agalta, Olancho) Type locality: Montaña de Peña Blanca, Sierra de Agalta, 4 km N of Catacamas, 14°53’26”N, 85°53’46”W, 1250 m elevation, departamento de Olancho, Honduras. |
| Reproduction | oviparous (not imputed, fide Zimin et al. 2022) |
| Types | Holotype: UNAH 1740 (Universidad Autónoma de Honduras, Tegucigalpa), an adult male, collected 13 September 1989 by Gustavo A. Cruz. |
| Diagnosis | Diagnosis: Omoadiphas cannula can be distinguished O. aurula in having 47 subcaudal scales in the male (38–39 in O. aurula; the “male” O. aurula with 35 subcaulals reported by Townsend et al. 2006 is in my opinion a female), six supralabials (seven), seven infralabials (eight), one postocular (two), the posterior nasal contacting the prefrontal (posterior nasal separated from prefrontal by loreal), a dorsal pattern of a dark stripe covering all of scale rows two and three (dark stripe on vertebral row and adjacent halves of scale rows two and three), and dark brown to nearly black ventral surfaces in preservative (pale yellow). Omoadiphas cannula differs from the single know specimen of O. texiguatensis (a subadult female) in having 31 subcaudals in the female (47 in O. texiguatensis) and the dark dorsolateral stripe involving all of scale rows two and three on each side (confined to scale row three). The affinities of the three species of Omoadiphas appear to lie with a group of six other genera of snakes (see Köhler et al. 2001; McCranie & Castañeda 2004) that are part of a larger group referred to as “goo-eaters.” Omoadiphas cannula differs from the species of these six other genera in the following ways: from Adelphicos in having 17 dorsal scale rows (15), 154 ventral scales in the male and 167 in the female (117–155 in both sexes combined), and no anterior temporal (anterior temporal present); from all Atractus in having a divided cloacal scute (entire) and from select species of Atractus in lacking an anterior temporal (anterior temporal present in some Atractus); from Chapinophis in having 154 ventral scales in the male and 167 in the female (178–196 both sexes combined), 47 subcaudal scales in the male (29–40 in both sexes combined), no anterior temporal (anterior temporal present), and no scale row reduction anteriorly on body (scale row reduction present); from Chersodromus in having 154 ventral scales in the male and 167 in the female (124–142 both sexes combined), 47 subcaudal scales in the male (maximum of 43), and a divided cloacal scute (entire); from all Geophis in having a divided cloacal scute (entire) and from select species of Geophis in lacking an anterior temporal (anterior temporal present in some Geophis); and from Ninia in having smooth dorsal scales (strongly keeled), a divided cloacal scute (entire), a striped body pattern (stripes absent), and in lacking an anterior temporal (anterior temporal present). (MCCRANIE & CRUZ-DÍAZ 2010) |
| Comment | The new species differs from O. aurula in number of subcaudal, supralabial, infralabial, and postocular scales, in color and pattern, and in having the posterior nasal scale in contact with the prefrontal scale. It differs from O. texiguatensis (known only from a subadult female) in having fewer subcaudals and the dark brown dorsolateral stripe involving all of scale rows two and three on each side of the body. |
| Etymology | The specific name cannula is formed from the Latin word canna (reed, cane) and Latin suffix –ulua (diminutive). The name refers to the Sierra de Agalta where this small snake was collected. The name Agalta is likely formed from the indigenous Pech language acatla (reed grass) and Tla (abundant). |
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