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Hydromorphus dunni SLEVIN, 1942

IUCN Red List - Hydromorphus dunni - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Dunn's Water Snake 
SynonymHydromorphus dunni SLEVIN 1942: 474
Hydromorphus dunni — KÖHLER 2008: 235
Hydromorphus dunni — WALLACH et al. 2014: 339 

Type locality: vicinity north of Boquete, Chiriquí, Panama, 1250 m elevation.  
TypesHolotype: CAS 78939 
DiagnosisDescription: Gastrosteges 164; urosteges 52c; scales in 15-15-13 rows, smooth, without pits; anal 2; supralabials 6-6; infralabials 8-8. On the right side of the head the loreal enters the eye under a small upper preocular, while on the left side it is entirely separated by two preoculars. The postoculars are 2-2; temporals 1-1-2 — 1-1-2; prefrontals 3, the median one being small; internasals 2; 3 infralabials in contact with anterior chinshields; nasal directed upward in a single plate.
The dorsal scales of the anal region are occupied by white keels or tubercles, the largest on the first scale row and extending for fourteen scales anterior and four posterior to the vent. On the fourth row they are on nine scales anterior to the vent (Slevin 1942: 474).

Coloration: above uniform olive; undersurface of body yellowish, with dark gray spotting on the outer edges of the gastrosteges; undersurface of tail grayish (Slevin 1942: 474). 
EtymologyNamed after Emmett Reid Dunn (1894-1956) [obituary in Schmidt 1957: 75]. 
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Köhler, G. 2008. Reptiles of Central America. 2nd Ed. Herpeton-Verlag, 400 pp.
  • Savage,J.M. & Donnelly,M.A. 1988. Variation and systematics in the colubrid snakes of the genus Hydromorphus. Amphibia-Reptilia 9: 289-300 - get paper here
  • Schmidt, K.P. 1957. Emmett Reid Dunn, 1894-1956. Copeia 1957 (2): 75-77 - get paper here
  • Slevin, J.R. 1942. Notes on a collection of reptiles from Boquete, Panama, with the description of a new species of Hydromorphus. Proc. Cal. Acad. Sci. 23: 463-480 - get paper here
  • Villa J D 1990. Hydromorphus Peters. Central American watersnakes. Catalogue of American Amphibians and Reptiles ( 472: 1-2 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
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