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Sibon perissostichon KÖHLER, LOTZKAT & HERTZ, 2010

IUCN Red List - Sibon perissostichon - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common Names 
SynonymSibon perissostichon KÖHLER, LOTZKAT & HERTZ 2010
Sibon perrisostichon — ROVITO et al. 2012 (in error)
Sibon perissostichon — WALLACH et al. 2014: 669 
DistributionW Panama

Type locality: near Lost and Found Ecohostel, Reserva Forestal La Fortuna, 8° 40.47’ N, 82° 12.97’ W, 1434 m elevation.  
Reproduction 
TypesHolotype: SMF 88716, adult female as judged by the shape of the base of the tail, collected by Sebastian Lotzkat on 14 May 2008. Original field number SL 145. 
DiagnosisDiagnosis.—Sibon perissostichon can be distinguished from its congeners by having 17 rows of dorsal scales at midbody and 15 rows one head length anterior to cloaca (vs. 13 or 15 rows of dorsal scales at midbody without reduction on posterior portion of body in all other species of Sibon), and dorsal scale rows that change orientation from the sides of body toward middorsum (vs. maintaining more or less the same orientation). Additionally, S. perissostichon differs from its congeners by the following characteristics: subcaudals 108 in S. perissostichon vs. 113–126 in female S. annulatus. Light interspaces between dark bands on body Sayal Brown (223C) in S. perissostichon vs. interspaces orange to redorange middorsally, grading to cream laterally in S. anthracops. Enlarged penultimate supralabial not in contact with eye in S. perissostichon vs. this scale in contact with eye in S. argus and S. longifrenis. Also, dark dorsal bands or spots reach well onto venter or even across venter in S. perissostichon vs. dark dorsal bands or spots reach at most to outer edges of ventrals, although dark shading may be present on venter in S. argus and S. longifrenis. One anterior temporal present in S. perissostichon vs. no such scale in S. carri. Therefore, penultimate supralabial not in contact with parietal in S. perissostichon vs. these scales in contact in S. carri. Bands solid dark brown, darker than interspaces in S. perissostichon vs. bands dark brown ventrally, their centers paler brown, paler than interspaces in S. dimidiatus. Dorsal surface of head with black markings, ground color of body brown, postmental single in S. perissostichon vs. dorsal surface of head with green or yellow as well as red and black markings, ground color of body green, and postmental divided in S. lamari. Ventrals 186, loreal in contact with eye in S. perissostichon vs. ventrals 155, loreal separated from eye in only known female specimen of S. linearis. Dark dorsal bands present, reaching well onto venter or even across venter in S. perissostichon vs. usually no dark dorsal bands and venter immaculate in S. manzanaresi and S. sanniolus. Ventrals 186, subcaudals 108, bands solid dark brown, darker than interspaces in S. perissostichon vs. ventrals 168–171 in females, subcaudals 95– 100 in females, bands dark brown ventrally, their centers paler brown, paler than interspaces in S. miskitus. Postmental present; therefore, first infralabials not in contact with each other, vertebral row not enlarged in S. perissostichon vs. first infralabials in contact with each other, no postmental, vertebral row moderately enlarged in S. nebulatus [from KÖHLER et al. 2010]. 
CommentAbundance: This species is known from a single specimen only. 
EtymologyThe name perissostichon is a noun in apposition and is derived from the Greek words perissos (beyond the regular number or size) and stichos (row, line), referring to the high number of dorsal scale rows in this species. 
References
  • Köhler, Gunther, Sebastian Lotzkat and Andreas Hertz. 2010. A new species of Sibon (Squamata: Colubridae) from western Panama. Herpetologica 66 (1): 80-85 - get paper here
  • Lotzkat, S.; A. Hertz; G. Köhler. 2012. A new species of Sibon (Squamata: Colubroidea: Dipsadidae) from the Cordillera Central of western Panama, with comments on other species of the genus in the area. Zootaxa 3485: 26–40 - get paper here
  • ROVITO, SEAN M.; THEODORE J. PAPENFUSS 2012. A new species of Sibon (Squamata: Colubridae) from the mountains of eastern Guatemala. Zootaxa 3266: 62–68 - 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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