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Atractus nigricauda SCHMIDT & WALKER, 1943

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Black-headed Ground Snake 
SynonymAtractus nigricaudus SCHMIDT & WALKER 1943: 327
Atractus nigricaudus — WALLACH et al. 2014: 77
Atractus nigricauda — BÖHME & DENZER 2019 (by implication) 
DistributionPeru (Junin)

Type locality: Huachon, east of Cerra de Pasco, Dep. de Junín, Peru, 10,000 ft elevation.  
Reproductionoviparous 
TypesHolotype: MCZ 45909 
DiagnosisDiagnosis. An Atractus close to bocourti and pauciscutatus, differing in having ventrals 157-158 in females, thus significantly separated from bocourti with ventrals 170-182 in females, on the one hand, and from pauciscutatus with ventrals 146 in the same sex on the other; differing from both in having the under side of the tail entirely or nearly entirely black, and from pauciscutatus in having the frontal as long as its distance from the end of the snout, instead of as long as its distance from the internasals [from SCHMIDT & WALKER 1943]. 
Comment 
EtymologyNamed after the black underside of the tail (Latin “niger, nigra, nigrum” = black and Latin “cauda” = tail). Note that cauda is a noun in apposition, hence it is -cauda, not -caudus as in most previous publications (see also Böhme and Denzer 2019). 
References
  • Böhme, W. & Denzer, W. 2019. Warum die Endungen adjektivischer Artnamen dem Geschlecht der Gattungsnamen angepasst werden müssen Sauria 41 (1): 55–62 - get paper here
  • Schmidt, K. P.; W. F. Walker, Jr. 1943. Three new snakes from the Peruvian Andes. Field Museum of Natural History, Chicago - Zoological Series 24 (28): 325-329 - get paper here
  • Schmidt,K.P. & WALKER Jr. ,W.F. 1943. Snakes of the Peruvian coastal region. Zool. Ser. Field Mus. nat. Hist., Chicago, 24: 297-327 - 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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