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Ctenotus youngsoni STORR, 1975

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Higher TaxaScincidae, Sphenomorphinae (Sphenomorphini), Scincoidea, Sauria, Squamata (lizards)
Common NamesE: Shark Bay South-west Ctenotus 
SynonymCtenotus youngsoni STORR 1975: 227
Ctenotus youngsoni — COGGER 1983: 155
Ctenotus youngsoni — COGGER 2000: 450
Ctenotus youngsoni — WILSON & SWAN 2010 
DistributionAustralia (Western Australia)

Type locality: Dirk Hartog Is., in 25° 50’ S, 113° 05’ E, W. A.  
TypesHolotype: WAM R42363 
DiagnosisDiagnosis: A large dark member of the C. labillardieri group with unbroken pale dorsolateral line; legs dark olive brown with or without blackish flecks or spots. Further distinguishable from C. lancelini by more numerous midbody scale rows (28-30, vs 24) (Storr 1978: 309).

Description (based on holotype and single paratype): Snout-vent length (mm): 48, 51. Length of appendages (% SVL): foreleg 24, 28; hindleg 42, 45.
Nasals narrowly separated. Prefrontals narrowly separated. Supraoculars 4, first 2 in contact with frontal. Supraciliaries 7. Palpebrals 11,10. Second loreal 1.5 and 1.4 times as wide as long. Upper labials 8. Ear lobules 3, subacute, second largest. Nuchals 3. Midbody scale rows 28,30. Lamellae under fourth toe 23, 21.
Dorsal and lateral ground colour olive grey. Very broad ragged-edged blackish-brown laterodorsal stripe, obscurely spotted with ground colour, and extending back to proximal quarter of tail where it breaks up into a series of irregular spots. Pale olive dorsolateral line extending back to base of tail. Side of body spotted with blackish brown, spots tending to align vertically. Legs olive brown, spotted with blackish brown.”(Storr 1975: 227) 
CommentLimb morphology: 5 digits, 5 toes (Singhal et al. 2018, Cogger 2014) 
EtymologyNamed after William Kenneth Youngson, an Australian zoologist. 
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Cogger, H. G. 2014. Reptiles and Amphibians of Australia, 7th ed. CSIRO Publishing, xxx + 1033 pp. - get paper here
  • Cogger, H.G. 2000. Reptiles and Amphibians of Australia, 6th ed. Ralph Curtis Publishing, Sanibel Island, 808 pp.
  • Couper, P., Covacevich, J., Amey, A. & Baker, A. 2006. The genera of skinks (Family Scincidae) of Australia and its island territories: diversity, distribution and identification. in: Merrick, J.R., Archer, M., Hickey, G.M. & Lee, M.S.Y. (eds.). Evolution and Zoogeography of Australasian Vertebrates. Australian Scientific Publishing, Sydney, pp. 367-384
  • KAY, GEOFFREY M. & J. SCOTT KEOGH 2012. Molecular phylogeny and morphological revision of the Ctenotus labillardieri (Reptilia: Squamata: Scincidae) species group and a new species of immediate conservation concern in the southwestern Australian biodiversity hotspot. Zootaxa 3390: 1–18 - get paper here
  • Singhal, Sonal; Huateng Huang, Maggie R. Grundler, María R. Marchán-Rivadeneira, Iris Holmes, Pascal O. Title, Stephen C. Donnellan, and Daniel L. Rabosky 2018. Does Population Structure Predict the Rate of Speciation? A Comparative Test across Australia’s Most Diverse Vertebrate Radiation. The American Naturalist - get paper here
  • Storr G M 1978. Taxonomic notes on the reptiles of the Shark Bay region, Western Australia. Rec. West. Aust. Mus. 6 (3): 303-318 - get paper here
  • Storr, G. M. 1975. The genus Ctenotus (Lacertilia: Scincidae) in the Kimberley and North-west Divisions of Western Australia. Rec. West. Aust. Mus. 3: 209-243 - get paper here
  • Storr, G. M., Smith, L. A. & Johnstone, R. E. 1981. Lizards of Western Australia. I. Skinks. Perth: University of Western Australia Press and Western Australian Museum, 200 pp.
  • Storr, G. M.; L. A. Smith, and R. E. Johnstone 1999. Lizards of Western Australia. I. Skinks. Revised Edition. Western Australian Museum
  • Wilson, S. & Swan, G. 2010. A complete guide to reptiles of Australia, 3rd ed. Chatswood: New Holland, 558 pp.
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