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Ctenotus dux STORR, 1969

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Higher TaxaScincidae, Sphenomorphinae (Sphenomorphini), Scincoidea, Sauria, Squamata (lizards)
Common NamesE: Fine Side-lined Ctenotus 
SynonymCtenotus dux STORR 1969: 104
Ctenotus dux — COGGER 1983: 146
Ctenotus dux — COGGER 2000: 421
Ctenotus dux — WILSON & SWAN 2010 
DistributionAustralia (Northern Territory,South Australia,Western Australia)

Type locality: 5 mi NE of Dunges Table, in 28° 08’ S, 123° SYE, W. A.  
TypesHolotype: WAM R30002 
DiagnosisDiagnosis: “A moderately large member of the taeniolatus group with a total of about 20 white and brown dorsal and lateral stripes on a black ground (with growth, brown dorsal stripes spread laterally at expense of black ground so that dorsum of adults is better described as brown, striped with black). Further distinguishable from ariadnae by clearer-cut lateral pattern, especially anteriorly (where white midlateral and ventrolateral stripes extend forward nearly to ear), and from quattuordecimlineatus by narrower and more numerous white lateral lines (including one between midlateral and ventrolateral white stripes).” (Storr 1969)

Description. “SVL (mm): 32-64. Length of appendages (% SVL): tail 176-226, foreleg 25-32, hindleg 42-54. Nasals usually in contact. Prefrontals in contact. Supraoculars 4, first 3 in contact with frontal. Supraciliaries usually 7, occasionally 6, rarely 8. Palpebrals 9-13. Second loreal 1.0-1.9 times as wide as high. Upper labials 8 (occasionally 9). Ear lobules 2-6, usually obtuse in juveniles and acute in adults. Nuchals 2-4 (mostly 3). Midbody scale-rows 28-32. Lamellae under fourth toe 23-30, each with a dark brown callus or obtuse keel.” (Storr 1969)

Coloration: “Dorsal ground colour brown (tinged with reddish or metallic olive) becoming darker and more olive on head, and paler and more buffy on tail and upper surface of limbs. Prominent black vertebral stripe from nape (where it is narrow) to base of tail, narrowly edged with pale brown or brownish white. Black laterodorsal stripe from last supraocular to proximal third of tail, almost as wide as vertebral stripe, narrowly and more or less obscurely margined above with pale brown. Dorsal zone between these black stripes (and their pale margins) variously marked with black. Immediately below laterodorsal stripe, a narrow but prominent white dorsolateral stripe from upper postocular to distal quarter of tail. Sides black with white lines or stripes, the widest of which are the lowest (ventrolateral) and third-lowest (midlateral); remainder wavy and very narrow. Midlateral white stripe extending from below and in front of eye to middle of tail, interrupted by ear aperture and almost completely by thigh. Ventrolateral white stripe from below and behind ear to groin, interrupted by arm. Head variegated with blackish. Sutures between labials margined with black or blackish brown. Limbs streaked with dark brown. Under surface bluish white (in alcohol), darkest on abdomen.” (Storr 1969) 
CommentAbundance: common, with more than 1000 specimens collected (Pianka 2011)

Limb morphology: 5 digits, 5 toes (Singhal et al. 2018, Cogger 2014) 
EtymologyNo etymology given in Storr 1969. 
  • 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
  • Pianka, E. R. 1969. Sympatry of desert lizards (Ctenotus) in Western Australia. Ecology 50: 1012-1030 - get paper here
  • Pianka, E. R. 1969. Habitat specificity, speciation, and species density in Australian desert lizards. Ecology 50 (3): 498-502 - get paper here
  • Prates, I., Singhal, S., Marchán-Rivadeneira, M. R., Grundler, M. R., Moritz, C., Donnellan, S., & Rabosky, D. 2021. Genetic and Ecogeographic Controls on Species Cohesion in Australia’s Most Diverse Lizard Radiation. American Naturalist 199 (2): E57-E75 - 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 1969. The genus Ctenotus (Lacertilia: Scincidae) in the Eastern Division of Western Australia. J. Royal Soc. Western Australia 51: 97-109 - get paper here
  • Storr G M 1970. The genus Ctenotus (Lacertilia: Scincidae) in the Northern Territory. J. Royal Soc. Western Australia 52: 97-108 [1969] - 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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