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Parvoscincus sisoni FERNER, BROWN & GREER, 1997

IUCN Red List - Parvoscincus sisoni - Vulnerable, VU

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Higher TaxaScincidae, Sphenomorphinae (Sphenomorphini), Scincoidea, Sauria, Squamata (lizards)
Subspecies 
Common Names 
SynonymParvoscincus sisoni FERNER, BROWN & GREER 1997: 188
Parvoscincus sisoni — BROWN et al. 1999
Parvoscincus sisoni — LINKEM, DIESMOS & BROWN 2011 
DistributionPhilippines (Panay)

Type locality: Philippines, Panay Island, Antique Province, Mt. Madj-as.  
Reproductionoviparous (not imputed, fide Zimin et al. 2022) 
TypesHolotype: PNM 2308 
DiagnosisDiagnosis (genus): Parvoscincus is diagnosed by the following combination of characters: (1) body size usually small (<55mm SVL) but larger in high-elevation species (46 mm < SVL < 86 mm); (2) four enlarged supraoculars; (3) paravertebral scales 51–110; (4) midbody scale rows 23–46; and (5) subdigital lamellae 10–20 [LINKEM, DIESMOS & BROWN 2011].

Diagnosis: Differs from the only other species of Parvoscincus in having: prefrontals pres ent (vs. absent); loreals two (vs. one, although the second may be quite reduced ventrally); and infralabials six (vs. five), and four phalanges in the fifth toe of the pes (vs. three). Description.-In general form, a small (maxi mum SVL ≤ 34 mm, Table 1), slender, dark brown skink with bluntly conical snout, and limbs that would not meet if appressed along trunk. Rostral projects strongly onto dorsal surface of snout, due to apparent depression of head; supranasals absent; nasals well separated; fron tonasal wider than long; prefrontals present, moderately separated; frontal longer than wide; supraoculars four, first two on each side con tacting frontal; frontoparietals and interparietal distinct, their combined midline length longer than frontal; parietal eye evident through clear area in posterior lobe of interparietal; parietals meeting behind interparietal; a small medial nuchal scale nestled between parietals; medial nuchal scales bordering parietals same size as adjacent body scales or in an enlarged pair. Nostril in center of anteriorly rising rhomboidal nasal; loreals two, but posterior loreal vary ing from being in contact ventrally with supra labial row to being squeezed off supralabial row to various degrees by contact between anterior loreal and lower preocular; preoculars two; pre subocular single; supraciliaries 9-10, first con tacting frontal and last largest and projecting deeply behind last supraocular; subocular scale row complete, interdigitating ventrally with Su pralabials; lower eyelid scaly, scales of upper edge of eyelid deep and extending ventrally across upper half of eyelid; pre-temporals two; primary temporal single; secondary temporals two, upper twice as large as and overlapping lower which itself is slightly larger than primary temporal; supralabials six, fourth subocular; postsupralabials two; external ear region cov ered by scales, its location indicated by a shal low dimple. Mental wider than long; postmental single; enlarged chin scales in three pairs, first pair in contact, second pair separated by one scale row and third pair separated by three scale rows; infralabials six, first two on each side contacted by postmental. Body scales smooth, in 24-26 longitudinal rows at midbody; paravertebrals slightly wider than scales in adjacent rows, numbering 62-68; medial pair of preanal scales enlarged, inner preanals overlapping outer; supradigital scales in single row; subdigital lamellae on fourth toe of pes, 11-12, and with a slight postaxial groove, i.e., slightly obtusely keeled. (Ferner et al. 1997: 188)

For a table of morphometric characters in 7 specimens see Table 1 in Ferner et al. 1997: 190. 
CommentType species: Parvoscincus sisoni FERNER, BROWN & GREER 1997 is the type species of the genus Parvoscincus FERNER, BROWN & GREER 1997.

Abundance: only known from its original description (Meiri et al. 2017). 
EtymologyNamed after Rogelio V. Sison, a herpetologist who was a taxidermist at the Philippine National Museum and now teaches taxidermy. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Brown, R.M. et al. 2010. Species boundaries in Philippine montane forest skinks (Genus Sphenomorphus): three new species from the mountains of Luzon and clarification of the status of the poorly known S. beyeri, S. knollmanae, and S. laterimaculatus. Scient. Pap. Nat. Hist. Mus. Univ. Kansas (42): 1-27
  • Brown, Rafe M., Jimmy A. McGuire, John W. Ferner and Angel C. Alcala 1999. New species of diminutive scincid lizard (Squamata: Lygosominae: Sphenomorphus) from Luzon Island, Republic of the Philippines. Copeia 1999 (2): 362-370 - get paper here
  • Ferner, John W., Rafe M. Brown, Rogelio V. Sison and Robert S. Kennedy 2000. The amphibians and reptiles of Panay Island, Philippines. Asiatic Herpetological Research 9: 1-37 - get paper here
  • Ferner,J.W., Brown,R.M. & Greer,A.E. 1997. A new genus and species of moist closed canopy forest skinks from the Philippines. Journal of Herpetology 31 (2): 187-192 - get paper here
  • Gaulke, M. 2011. The herpetofauna of Panay Island, Philippines. Edition Chimaira, 390 pp.
  • Gaulke, M. 2013. Abenteuerurlaub auf den Philippinen. Reptilia (Münster) 18 (100): 114-125 - get paper here
  • Linkem, Charles W.; Arvin C. Diesmos, Rafe M. Brown 2011. Molecular systematics of the Philippine forest skinks (Squamata: Scincidae: Sphenomorphus): testing morphological hypotheses of interspecific relationships. Zoological Journal of the Linnean Society 163: 1217–1243 - 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
  • Zimin, A., Zimin, S. V., Shine, R., Avila, L., Bauer, A., Böhm, M., Brown, R., Barki, G., de Oliveira Caetano, G. H., Castro Herrera, F., Chapple, D. G., Chirio, L., Colli, G. R., Doan, T. M., Glaw, F., Grismer, L. L., Itescu, Y., Kraus, F., LeBreton 2022. A global analysis of viviparity in squamates highlights its prevalence in cold climates. Global Ecology and Biogeography, 00, 1–16 - get paper here
 
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