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Geagras redimitus COPE, 1875

IUCN Red List - Geagras redimitus - Data Deficient, DD

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Higher TaxaColubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common NamesTehuantepec Striped Snake 
SynonymGeagras redimitus COPE 1876: 141
Geagras redimitus — COPE 1885: 177
Sphenocalamus lineolatus FISCHER 1885: 5
Tantilla depressa DUNN 1928
Geagras redimitus — LINER 1994
Geagras redimitus — LINER 2007
Geagras redimitus — WALLACH et al. 2014: 299 
DistributionMexico (Oaxaca, Sinaloa ?)

Type locality: “west side of the State of Tehuantepec, Mexico” [= Pacific versant of Isthmus of Tehuantepec, Oaxaca, Mexico].

Type locality (Sphenocalamus lineolatus): Mazatlán (no state given). Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
 
Reproductionoviparous 
TypesHolotype: USNM 30115 
CommentType species: Geagras redimitus COPE 1876: 141 is the type species of the genus Geagras COPE 1876.

Synonymy: There has been some speculation that this genus is a synonym of Tantilla. However, no molecular data appears to be available.

Distribution: Records of this species from Michoacán (Duellman, 1961) are based on Tantilla calamarina (Wilson and Meyer, 1981). Reports from Sinaloa may be in error. Hardy and McDiarmid (1969) listed G. redimitus as part of the Sinaloan herpetofauna, in part based on Duellman’s (1961) misidentification (fide WILSON & MATA-SILVA 2015).

Diagnosis (genus): Wilson (1987: 430.1) defined Geagras as “a colubrid genus characterized by: slender body with head not noticeably distinct from body; head cuneiform, head scutellation accordingly modified and simplified, consisting of a cuneiform rostral, two internasals and prefrontals, a broad scutiform frontal, two parietals, divided nasal, no loreal, single tiny preocular widely separated from postnasal, single postocular, temporals 1+1; five supralabials, with the third entering the orbit; six infralabials, with four touching anterior chin shields and fourth the largest; dorsal scales smooth, in 15 rows throughout; ventrals 113–124; anal plate divided; subcaudals 26–33, paired; maximum known total length 235 mm; maxillary teeth 10 (one count), separated by a short diastema from two distinctly enlarged grooved fangs; hemipenis simple [Smith, 1943, indicated the organ to be capitate, which appears unlikely] with single sulcus spermaticus, distal third calyculate, median third spinose, proximal third bare; dorsal color pattern of narrow diffuse dark lines or stripes coursing the length of all but two lower scale rows; head pattern of a dark median spatulate blotch bounded laterally by narrow pale markings which unite on snout, these in turn bounded below by a dark facial stripe.” (cited in WILSON & MATA-SILVA 2015). 
References
  • Casas-Andreu, G., F.R. Méndez-De la Cruz and X. Aguilar-Miguel. 2004. Anfibios y Reptiles; pp. 375–390, in A.J.M. García-Mendoza, J. Ordoñez and M. Briones-Salas (ed.). Biodiversidad de Oaxaca. Instituto de Biología, UNAM-Fondo Oaxaqueño para la Conservación de la Naturaleza-World Wildlife Fund, México, D. F.
  • Cope, E.D. 1875. On the Batrachia and Reptilia of Costa Rica with notes on the herpetology and ichthyology of Nicaragua and Peru. Journal of the Academy of Natural Sciences of Philadelphia N.S. (2) 8: 93-183 [sometimes said to be published 1876 but see Murphy et al. 2007 for clarification]] - get paper here
  • Cope, E.D. 1885. Twelfth contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc. 22: 167-194 [1884] - get paper here
  • Duellman, W.E. 1961. The amphibians and reptiles of Michoacan, Mexico. Univ. Kansas Publ. Mus. Nat. Hist. 15 (1) 148 pp. - get paper here
  • Dunn, E. R. 1928. New Central American snakes in the American Museum of Natural History. American Museum Novitates (314): 1-4 - get paper here
  • Fischer, J. G. 1883. Beschreibungen neuer Reptilien. Jahresber. Naturhist. Mus. Hamburg 1882: 1-15
  • Hardy, L.M., & McDiarmid, R.W. 1969. The amphibians and reptiles of Sinaloa, Mexico. Univ. Kansas Publ. Mus. Nat. Hist. 18 (3): 39-252. - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Liner, Ernest A. 2007. A CHECKLIST OF THE AMPHIBIANS AND REPTILES OF MEXICO. Louisiana State University Occasional Papers of the Museum of Natural Science 80: 1-60 - get paper here
  • Mata-Silva, Vicente, Jerry D. Johnson, Larry David Wilson and Elí García-Padilla. 2015. The herpetofauna of Oaxaca, Mexico: composition, physiographic distribution, and conservation status. Mesoamerican Herpetology 2 (1): 6–62 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. Taylor and Francis, CRC Press, 1237 pp.
  • Wilson L D 1988. Geagras Cope. Catalogue of American Amphibians and Reptiles ( 430: 1-2 - get paper here
  • Wilson L D; Meyer J R 1981. Systematics of the Calamarina group of the colubrid snake genus Tantilla. Milwaukee Public Museum Contributions in Biology and Geology (No. 42): 1-25
  • Wilson, Larry David and Vicente Mata-Silva 2015. A checklist and key to the snakes of the Tantilla clade (Squamata: Colubridae), with comments ondistribution and conservation. Mesoamerican Herpetology 2 (4): 418 - get paper here
 
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