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Celatiscincus euryotis (WERNER, 1910)

IUCN Red List - Celatiscincus euryotis - Endangered, EN

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Higher TaxaScincidae, Eugongylinae (Eugongylini), Scincoidea, Sauria, Squamata (lizards)
Common Names 
SynonymLygosoma euryotis WERNER 1910: 271
Lygosoma euryotis — SMITH 1937
Leiolopisma euryotis — GREER 1974
Leiolopisma euryotis — ZUG 1985
Marmorosphax euryotis — SADLIER 1987: 36
Marmorosphax euryotis — ADLER, AUSTIN & DUDLEY 1995
“Lygosoma” euryotis — BAUER & SADLIER 2000
Celatiscincus euryotis — SADLIER, SMITH & BAUER 2006 
DistributionNew Caledonia

Type locality: “Iles de Pins, nouvelle-Calédonie”.  
TypesHolotype: IRSNB 2.025 
DiagnosisDiagnosis (genus Celatiscincus): The following suite of apomorphic characters in combination will distinguish Celatiscincus from all other genera in the Eugongylus group of Greer (1979): frontoparietal scales fused; naris positioned in a single large nasal scale, with no evidence of scale or postnasal suture; anterior loreal reduced, either contacting upper labials narrowly, or present as a semilunar scale failing to contact upper labials; contact between lower eyelid and adjacent upper labials interrupted by the presence of complete subocular scale row; parietal scales each bordered by a single enlarged upper temporal scale and 2 (rarely 3) equal sized nuchal scales no larger than the surrounding dorsal scales; lower eyelid with an obvious, centrally located semitransparent disc; ear lobules barely distinguishable from blunt conical scales around upper, lower, and posterior edges of ear opening; premaxillary teeth 13; atlantal arches of first cervical vertebrae fused to intercentrum. The genus sharing the greatest number of derived features with Celatiscincus is Sigaloseps. However, Sigaloseps lacks the elevated number of premaxillary teeth and has each parietal bordered by an enlarged upper secondary temporal and transversely enlarged nuchal scale, rather than an enlarged upper secondary temporal and two (or more) smaller equal sized scales seen in Celatiscincus. Further, Sigaloseps has smooth body scales, whereas Celatiscincus has keeled body scales. The polarity of this latter character has yet to be determined. Comparison to the two closest outgroups: New Zealand+Australian Eugongylus group species and Eugongylus+Emoia+Leiolopisma (based on genetic evidence—Smith, 2001) would indicate smooth scales are the pleisiomorphic state at the level of the New Caledonian radiation [from SADLIER et al. 2006]. 
CommentSMITH (1937: 225) remarked that euryotis is “doubtfully distinct from tricolor”. Common, but restricted to a few localities.

Type Species: Lygosoma euryotis WERNER 1910 is the type species of the genus Celatiscincus Sadlier, Smith, & Bauer 2006.

Abundance: only known from the type locality (Meiri et al. 2017). 
EtymologyThe name Celatiscincus is derived from celatus, the Latin for concealed and scincus, a Latinized version of a Greek word for lizard, particularly applied to skinks or other “shiny-scaled” lizards, and alludes to the isolation of the ranges of the constituent species and the fact that the identity and affinities of these taxa remained “hidden” to systematists for so long. The name is masculine. 
  • Adler,G.H.; Austin,C.C. & Dudley,R. 1995. Dispersal and speciation of skinks among archipelagos in the tropical Pacific Ocean. Evolutionary Ecology 9: 529-541 - get paper here
  • Barts, M. 2006. Verbeulte Geckos und geschwätzige Skinke - neue Echsen aus Neukaledonien. Terraria 1 (1): 28-29
  • Bauer, A. M. & SADLIER, R. A. 2000. The herpetofauna of New Caledonia. Contributions to Herpetology, 17; Society for Study Amphibians and Reptiles, Ithaca, New York.
  • Bauer, A.M. & Sadlier,R.A. 1993. Systematics, biogeography and conservation of the lizards of New Caledonia. Biodiv. Lett. 1: 107-122 - get paper here
  • Bauer, Aaron M.;Sadlier, Roass A. 1994. The terrestrial herpetofauna of the Ile des Pins, New Caledonia. Pacific Science 48 (4): 353-366
  • Bauer, Aaron M.;Vindum, Jens V. 1990. A checklist and key to the herpetofauna of New Caledonia, with remarks on biogeography. Proc. Cal. Acad. Sci. 47 (2): 17-45 - get paper here
  • Meiri, Shai; Aaron M. Bauer, Allen Allison, Fernando Castro-Herrera, Laurent Chirio, Guarino Colli, Indraneil Das, Tiffany M. Doan, Frank Glaw, Lee L. Grismer, Marinus Hoogmoed, Fred Kraus, Matthew LeBreton, Danny Meirte, Zoltán T. Nagy, Cristiano d 2017. Extinct, obscure or imaginary: the lizard species with the smallest ranges. Diversity and Distributions - get paper here
  • Sadlier R A 1987. A review of the scincid lizards of New Caledonia. Rec. Austral. Mus. 39(1) 1987: 1-66 [1986] - get paper here
  • Sadlier, R.A.; Smith, S.A.; Bauer, A.M. 2006. A new genus for the New Caledonian scincid lizard Lygosoma euryotis Werner, 1909, and the description of a new species. Rec. Austral. Mus. 58 (1):19-28. - get paper here
  • Smith, M.A. 1937. A review of the genus Lygosoma (Scincidae: Reptilia) and its allies. Records of the Indian Museum 39 (3): 213-234
  • Werner, F. 1910. Neue oder seltenere Reptilien des Musée Royal d'Histoire Naturelle de Belgique in Brüssel. [Mabuia dolloi, Mabuia polylepis]. Zool. Jb. Abt. Syst. Okol. Geogr. 28 [1909]: 263-288. - get paper here
  • Zug,G. R. 1985. A new skink (Reptilia: Sauria: Leiolopisma) from Fiji. Proc. Biol. Soc. Washington 98 (1): 221-231 - get paper here
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