Celatiscincus euryotis (WERNER, 1910)
Can you confirm these amateur observations of Celatiscincus euryotis?
|Higher Taxa||Scincidae, Eugongylinae, Scincoidea, Sauria, Squamata (lizards)|
|Synonym||Lygosoma euryotis WERNER 1910: 271|
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
Type locality: “Iles de Pins, nouvelle-Calédonie”.
|Types||Holotype: IRSNB 2.025|
|Diagnosis||Diagnosis of the 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].|
Diagnosis of C. euryotis: Celatiscincus euryotis is distinguished in morphology from Celatiscincus similis n.sp. (the only other species in the genus) by differences in adult colouration and osteology. Adult male Celatiscincus similis n.sp. have a bright russet flush to the body around the area of the hindlimbs, and adult females a bright russet flush to the whole of the tail, whereas these colours are muted in Celatiscincus euryotis (see also Bauer & Sadlier  for a discussion of colour in C. euryotis). Celatiscincus euryotis has fewer presacral vertebrae than Celatiscincus similis n.sp.. These differences in colouration and osteology are supported by DNA sequence data.
|Comment||SMITH (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.
Abundance: only known from the type locality (Meiri et al. 2017).
|Etymology||The 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.|
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