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Christinus marmoratus (GRAY, 1845)

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesE: Marbled Southern Gecko, Marbled Gecko 
SynonymPhyllodactylus porphyreus DUMÉRIL & BIBRON 1836 (partim)
Phyllodactylus Peronii FITZINGER 1843: 95
Diplodactylus marmoratus GRAY 1845
Goniodactylus australis GRAY 1845
Gonatodes australis — BOULENGER 1885: 72 (?)
Phyllodactylus marmoratus — BOULENGER 1885: 88
Phyllodactylus macrodactylus BOULENGER 1885: 89
Phyllodactylus affinis — BOULENGER 1885: 89
Phyllodactylus marmoratus — LOVERIDGE 1934
Phyllodactylus marmoratus — BUSTARD 1965
Phyllodactylus marmoratus — COGGER 1983
Christinus marmoratus — WELLS & WELLINGTON 1984
Christinus biggsae WELLS & WELLINGTON 1985: 10
Phyllodactylus marmoratus marmoratus — STORR 1987
Christinus marmoratus marmoratus — RÖSLER 2000: 62
Christinus marmoratus macrodactylus — RÖSLER 2000: 62
Christinus marmoratus — COGGER 2000: 208
Christinus marmoratus — WILSON & SWAN 2010: 60
Christinus marmoratus — HEINICKE et al. 2014 
DistributionAustralia (New South Wales, South Australia, Victoria, Western Australia)

Type locality: restricted to West- and South Australia (Kangaroo Island, Swan River, Freemantle, Champion Bay, Houtman’s Abrolhos, Norfolk Island, Aneitum).

Type locality: “Australia” and “Houtman’s Abrollos” [GRAY 1845].

Type locality: Australia [macrodactylus].  
Reproductionoviparous 
TypesLectotype: BMNH xxi.9.a. Designated by Wells & Wellington (1985) (marmoratus)
Syntypes: MNHN 6734, 6734A [Peronii]
Holotype: BMNH 55.8.16.15 [affinis]
Holotype: BMNH xxii.86a [australis]
Syntypes: BMNH 70.6.26.60 [macrodactylus]
Holotype: AMS 116977 [biggsae] 
DiagnosisDefinition (genus). Christinus is distinguishable from all other geckos based on the following combination of characters: size large (70–80 mm max. SVL), with a moderately proportioned head, cylindrical body, and round, tapering tail. Digits are free and bear a single pair of dilated terminal adhesive pads (‘leaf toes’); claws are present on all digits. Dorsal scalation consists of small, smooth granules. Preanal pores are absent; 3–4 cloacal spurs are present. The eye bears a vertical pupil with crenate margins. The skull displays no co-ossification with the overlying skin. Nasals are fused; frontal single; parietal paired; stapes imperforate; 14 scleral ossicles; 12-13 premaxillary and between 30 and 39 dentary tooth loci; hyoid with second ceratobranchial cartilages. There are 27–28 presacral vertebrae and one pair of cloacal bones. The phalangeal formula is 2-3-4-5-3 (manus)/2-3-4-5-4 (pes); paraphalangeal elements are absent.
Four cranial osteological apomorphies were found for Christinus marmoratus: lateral vertex of the postorbitofrontal located anterior to the frontoparietal suture (95-00, Fig. 28); length of the exposed portion of the frontal shorter than the width of the frontoparietal suture (127-20, Fig. 28); number of premaxillary tooth loci 12 or 13 (368-00).
Christinus has more presacral vertebrae than any other genus of leaf-toed gecko. It can be distinguished from all other Australian leaf-toed gecko genera (which belong to the family Diplodactylidae) based on possession of enlarged scales on the dorsal surface of the broadened terminal adhesive pads, as well as all traits that distinguish gekkonids from diplodactylids (including L-shaped meatal closure muscles, hard-shelled eggs, and a single centre of ossification in the premaxilla; Kluge, 1987) [HEINICKE et al. 2014]

Diagnosis (Christinus): The genus Christinus Is characterised by the following: Round rostral and mental, with postmentals enlarged; enlarged lablals; no preanal pores; digits lay flat, long and thin, somewhat depressed; distal expansion of digits form distinct pads; apical sub-digital lamellae as large pair; sub-digital lamellae enlarged but smaller than apical; digits have dorsal scales which are larger distally than at base; all digits possess retractile claws which fit into a groove in the apical lamellae; dorsal scales small, smooth and homogeneous; clutch size two, but practices communal egg-laying behaviour; size up to 80 mm SVL. A relictual group of endemics confined to southern Australia and the Lord Howe and Norfolk Island groups. A colour plate of Christinus marmoratus is in Cogger, (1983, pI. 85) and a plate of Christinus guentheri can be found in Cogger, Sadlier and Cameron, (1983) [from WELLS & WELLINGTON 1984]. 
CommentKaryotype: Christinus marmoratus marmoratus is a composite of two chromosomally distinct, but morphologically very similar taxa.

Type species: Diplodactylus marmoratus GRAY 1845 is the type species of the genus Christinus WELLS & WELLINGTON 1994. See comments in Bauer 1994 for a discussion of nomenclatorial issues.

Subspecies: Christinus marmoratus macrodactylus is not recognized as subspecies any more (Glenn Shea, pers. comm. Feb 2019). 
EtymologyEtymology (Christinus): Named for Miss Christine Biggs of London. 
References
  • Bauer, A.M. 1994. Liste der rezenten Amphibien und Reptilien: Gekkonidae I (Australia). Das Tierreich, Vol. 108, W. de Gruyter & Co. (Berlin)
  • Boulenger, G.A. 1885. Catalogue of the lizards in the British Museum (Nat. Hist.) I. Geckonidae, Eublepharidae, Uroplatidae, Pygopodidae, Agamidae. London: 450 pp. - get paper here
  • Bush, B. 1981. Reptiles of the Kalgoorlie-Esperance Region. B. Bush, Perth, 46 pp - get paper here
  • Bustard, H.R. 1965. Observations on Australian geckos Herpetologica 21 (4): 294-302. - 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.
  • Donnellan,S.C.; Aplin,K.P. & Dempsey,P.J. 2000. Genetic and morphological variation in Australian Christinus (Squamata: Gekkonidae): preliminary overview with recognition of a cryptic species on the Nullarbor plain. Australian Journal of Zoology 48: 289-315 - get paper here
  • Fitzinger, L. 1843. Systema Reptilium, fasciculus primus, Amblyglossae. Braumüller et Seidel, Wien: 106 pp. - get paper here
  • Gray, J. E. 1845. Catalogue of the specimens of lizards in the collection of the British Museum. Trustees of die British Museum/Edward Newman, London: xxvii + 289 pp. - get paper here
  • Hallermann, J. 2020. An annotated list of reptiles and amphibians from the 1905 Hamburg expedition to southwest Australia deposited in the Zoological Museum Hamburg. Evolutionary Systematics 4: 61 - get paper here
  • Heinicke, Matthew P.; Juan D. Daza, Eli Greenbaum, Todd R. Jackman & Aaron M. Bauer 2014. Phylogeny, taxonomy and biogeography of a circum-Indian Ocean clade of leaf-toed geckos (Reptilia: Gekkota), with a description of two new genera. Systematics and Biodiversity 12 (1): 23-42, DOI:10.1080/14772000.2013.877999 - get paper here
  • How, RA, Cowan, MA, Teale, RJ, Schmitt, LH. 2020. Environmental correlates of reptile variation on the Houtman Abrolhos archipelago, eastern Indian Ocean. J Biogeogr. 47: 2017– 2028 - get paper here
  • Kay, G.M.; D. Michael; M. Crane; S. Okada; C. MacGregor; D. Florance; D. Trengove; L. McBurney; D. Blair; D.B. Lindenmayer. 2013. A list of reptiles and amphibians from Box Gum Grassy Woodlands in south-eastern Australia. Check List 9 (3):476-481 - get paper here
  • King, M.; Rofe, R. 1976. Karyotypic variation in the Australian gekko Phyllodactylus marmoratus (Gray) (Gekkonidae: Reptilia). Chromosoma 54(1):75-87 - get paper here
  • Michael, D.R.; D.B. Lindenmayer; M. Crane; C. MacGregor; R. Montague-Drake; L. McBurney. 2011. Reptilia, Murray catchment, New South Wales, southeastern Australia. Check List 7 (1):25-29 - get paper here
  • Rösler, H. 2000. Studien an den Begattungsorganen der Geckos (Reptilia: Gekkota) - 5. Der Hemipenis von Christinus marmoratus marmoratus (GRAY 1845) (Gekkonidae: Gekkoninae). Gekkota 2: 255-258
  • Rösler, H. 2000. Kommentierte Liste der rezent, subrezent und fossil bekannten Geckotaxa (Reptilia: Gekkonomorpha). Gekkota 2: 28-153
  • Rösler, Herbert 1995. Geckos der Welt - Alle Gattungen. Urania, Leipzig, 256 pp.
  • Rösler, Herbert 2017. Gecko-Chorologie (Squamata: Gekkota). Gekkota (4): 1-160
  • Storr, G. M. 1987. The genus Phyllodactylus (Lacertilia: Gekkonidae) in Western Australia. Rec. West. Austr. Mus. 13 (2): 275-284 - get paper here
  • Swan, G.; Sadlier, R.; Shea, G. 2017. A field guide to reptiles of New South Wales. Reed New Holland, 328 pp.
  • Wells, R. W. and Wellington, C. R. 1985. A classification of the Amphibia and Reptilia of Australia. Australian Journal of Herpetology, Supplementary Series (1): 1-61 [sometimes cited as 1983] - get paper here
  • Wilson, S. & Swan, G. 2010. A complete guide to reptiles of Australia, 3rd ed. Chatswood: New Holland, 558 pp.
 
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