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Leptodeira larcorum SCHMIDT & WALKER, 1943

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common Names 
SynonymLeptodeira larcorum SCHMIDT & WALKER 1943: 311
Leptodeira rhombifera larcorum — SHREVE 1947
Leptodeira septentrionalis larcorum — DUELLMAN 1958
Leptodeira septentrionalis larcorum — PETERS 1960
Leptodeira septentrionalis larcorum — KOCH et al. 2018: 71
Leptodeira larcorum — BARRIO-AMORÓS 2019
Leptodeira larcorum — TORRES-CARVAJAL et al. 2020 
DistributionPeru (Cajamarca, Libertad)

Type locality: Chiclin, Libertad, Peru.  
TypesHolotype: FMNH 34302 
DiagnosisDiagnosis: A Leptodeira resembling L. rhombifera of Central America and northwestern South America in having vertebral and paravertebral scale rows little if at all enlarged, and thus differing from L. annulata annulata; differing from rhombifera in having a higher number of ventrals, 175-184 versus 158-178, and caudals, 78-91 versus 64-84, and in the strong tendency for the dorsal spots to fuse into a zigzag line (in the latter respect resembling annulata annulata; Dunn, 1936, p. 691; from SCHMIDT & WALKER 1943: 311).

Description of type. A snake with large head, distinct from the neck, with a large eye; body slightly compressed. Rostral much broader than high, scarcely visible from above; internasals shorter than the prefrontals; frontal one-third longer than broad, as long as its distance from the end of the snout, shorter than the parietals;
nasal divided; loreal slightly longer than high; a large preocular, in contact with the frontal; a small inferior preocular formed by division of the third labial; 2 postoculars; temporals 1-2, with a small additional anterior temporal cut off from the seventh labial; upper labials 8, the fourth and fifth entering the eye; lower labials 10, six in contact with the chin shields; posterior chin shields slightly longer than anterior; dorsal scales smooth, simplified formula 19-21-15; ventrals 184, anal divided, caudals 91.
Head grayish brown with a butterfly-shaped darker marking on the parietals and occiput, and a dark band from snout to angle of mouth; grayish brown above, with alternating paravertebral blotches that tend to fuse into a zigzag dorsal band; a lateral row of alternating spots, with still smaller spots on the first and second scale rows; lateral spots disappearing on the tail; uniform yellow beneath, with faint brown markings on the chin and lower labials (SCHMIDT & WALKER 1943: 311) 
CommentSubspecies: This species has been considered as a synonym or subspecies of Leptodeira septentrionalis, but was revalidated by BARRIO-AMORÓS 2019.

Similar species: Leptodeira septentrionalis, Leptodeira ornata; Almendáriz & Carr (2012) reported L. larcorum (indentified as L. septentrionalis larcorum) from Machalilla National Park in Manabí Province, Ecuador; however, all specimens from this area included in the phylogeny of Torers-Carvajal et al. 2020 belong to L. ornata. 
  • Barrio-Amorós, César L. 2019. On the taxonomy of snakes in the genus Leptodeira, with an emphasis on Costa Rican species. IRCF 26 (1): 1–15 - get paper here
  • Duellman,W.E. 1958. A monographic study of the colubrid snake genus Leptodeira. Bull. Amer. Mus. Nat. Hist. 114 (1): 1-152 - get paper here
  • KOCH, CLAUDIA; PABLO J. VENEGAS, ROY SANTA CRUZ, WOLFGANG BÖHME 2018. Annotated checklist and key to the species of amphibians and reptiles inhabiting the northern Peruvian dry forest along the Andean valley of the Marañón River and its tributaries. Zootaxa 4385 (1): 001–101 - get paper here
  • Peters , J. A. 1960. The snakes of the subfamily Dipsadinae. Misc. Publ. Mus. Zool., Univ. Michigan (114): 224 pp. - 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
  • Shreve, B. 1947. On Colombian reptiles and amphibians collected by Dr. R. E. Schultes. Caldasia 4 (19): 311-316 - get paper here
  • TORRES-CARVAJAL, OMAR; JUAN C. SÁNCHEZ-NIVICELA, VALENTINA POSSE, ELVIS CELI, CLAUDIA KOCH 2020. A new species of cat-eyed snake (Serpentes: Dipsadinae: Leptodeirini) from the Andes of southern Ecuador. Zootaxa 4895 (3): 357–380 - get paper here
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