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Pseudoacontias unicolor SAKATA & HIKIDA, 2003

IUCN Red List - Pseudoacontias unicolor - Vulnerable, VU
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Higher TaxaScincidae, Scincinae, Scincoidea, Sauria, Squamata (lizards)
Subspecies 
Common Names 
SynonymPseudoacontias unicolor SAKATA & HIKIDA 2003
Pseudoacontias unicolor — SCHMITZ et al. 2005 
DistributionMadagascar (Nossi Be = Nosy Bé)

Type locality: near Ambanoro, about 100 m elevation, 13°24’25’’ S, 48°18’11’’ E, Lokobe Reserve, Nosy Be Fivondronana, Antsiranana Province, Madagascar.  
Reproduction 
TypesHolotype: KUZ R50725 
DiagnosisDiagnosis: A Pseudoacontias lacking hind limbs; frontonasal quadrangular; supraocular scales two, first separated from parietal; pretemporal single; interparietal triangular with two slightly longer sides; supralabials five; subocular supralabial as tall as other supralabials; infralabials five; lower eyelid moveable and consisting of two rows of amall scales; mid-body scale rows 30; presacral vertebrae 81. 
CommentOnly known from a single specimen.

Abundance: only known from the type locality (Meiri et al. 2017). This is one of the species called 'lost' and 'rediscovered' by Lindken et al. 2024. 
EtymologyNamed after its uniformly grayish dorsal coloration. The name unicolor is formed from Latin words uni (one) and color (color). Limbless; no ear openings visible. 
References
  • Lindken T.; Anderson, C. V., Ariano-Sánchez, D., Barki, G., Biggs, C., Bowles, P., Chaitanya, R., Cronin, D. T., Jähnig, S. C., Jeschke, J. M., Kennerley, R. J., Lacher, T. E. Jr., Luedtke, J. A., Liu, C., Long, B., Mallon, D., Martin, G. M., Meiri, 2024. What factors influence the rediscovery of lost tetrapod species? Global Change Biology, 30: 1-18 - 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
  • Sakata, S. & Hikida, T. 2003. A new fossorial scincine lizard of the genus Pseudoacontias (Reptilia: Squamata: Scincidae) from Nosy Be, Madagascar. Amphibia-Reptilia 24 (1): 57-64 - get paper here
  • Schmitz, A.; M.C. Brandley; P. Mausfeld; M. Vences; F. Glaw; R.A. Nussbaum and T.W. Reeder 2005. Opening the black box: phylogenetics and morphological evolution of the Malagasy fossorial lizards of the subfamily “Scincinae”. Molecular Phylogenetics and Evolution 34: 118–133 (published online 2004) - get paper here
 
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