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Issue: Vol. 1313 No. 1: 14 Sept. 2006
Type: Articles
Published: 2006-09-14
DOI: 10.11646/zootaxa.1313.1.1
Page range: 1–38
Abstract views: 44
PDF downloaded: 3

A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species

Australian National Wildlife Collection, CSIRO Sustainable Ecosystems, PO Box 284 Canberra, ACT, Australia; formerly Western Australian Museum, Francis Street, Perth, Western Australia 6000, Australia
School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
Deceased, formerly Research Associate of Western Australian Museum, Francis Street, Perth, Western Australia 6000, Australia
Reptilia Varanus goanna Australia taxonomy mitochondrial DNA sexual dimorphism

Abstract

We describe a new species of Varanus similar to V. caudolineatus and V. gilleni but distinguishable from each of these taxa on genetic and morphological criteria. The three species are closely related and together constitute a species group within subgenus Odatria. The new species is restricted to the Pilbara region of Western Australia and appears to be sympatric with V. caudolineatus at several localities. It is more widely separated from known populations of V. gilleni. The new species is associated with mulga woodland and is at least partially arboreal, but little else is known of its ecology. Combined morphometric and meristic analyses indicate complex patterns of sexual dimorphism in all three species, including relative body elongation in females that is reflected in higher modal presacral vertebral counts in females than males of each species. Body elongation of females needs to be taken into account in future analyses of sexual dimorphism in varanid lizards.

References

  1. Arévalo, E., Davis, S.K. & Sites Jr, J.W. (1994) Mitochondrial DNA sequence divergence and phylogenetic relationships among eight chromosome races of the Sceloporus grammicus complex (Phrynosomatidae) in central Mexico. Systematic Biology, 43, 387–418.

    Ast, J.C. (2001) Mitochondrial DNA evidence and evolution in Varanoidea (Squamata). Cladistics, 17, 211–226.

    Boulenger, G.A. (1885) Catalogue of the lizards in the British Museum (Natural History). Volume 2. British Museum, London, xiii + 497 pp.

    Branch, W.R. (1982) Hemipeneal morphology of platynotan lizards. Journal of Herpetology, 16, 16–38.

    Bremer, K. (1988) The limits of amino acid sequence data in angiosperm phylogenetic reconstruction. Evolution, 42, 795–803.

    Cogger, H.G., (2000) Reptiles and Amphibians of Australia. Reed New Holland, Sydney, New South Wales, 808 pp.

    Eidenmüller, B. & Wickler, R. (1997) The breeding of Gillen’s Pygmy Monitor Varanus gilleni, Lucas & Frost 1895. Herpetofauna, 27, 2–5.

    Eriksson, T. (1998) AutoDecay v 4.0. Bergius Foundation, Royal Swedish Academy of Sciences: Stockholm, Sweden.

    Forstner, M.R., Davis, S.K. & Arévalo, E. (1995) Support for the hypothesis of anguimorph ancestry for the suborder Serpentes from phylogenetic analysis of mitochondrial DNA sequences. Molecular Phylogenetics and Evolution, 4, 93–102.

    Fuller, S., Baverstock, P. & King, D. (1998) Biogeographic origins of goannas (Varanidae): a molecular perspective. Molecular Phylogenetics and Evolution, 9, 294–307.

    Greer, A.E., (1989) The Biology and Evolution of Australian Lizards. Surrey Beatty, Sydney, New South Wales, 264 pp.

    Greer, A.E. & Smith, S. (1999) Aspects of the morphology and reproductive biology of the Australian Earless Dragon Lizard Tympanocryptis tetraporophora. Australian Zoologist, 31, 55–70.

    Horn, H.-G. (2004) Varanus gilleni. In: Pianka, E.R., King, D.R. & King, R.A. (Eds.), Varanoid Lizards of the World. Indiana University Press, Indiana, pp. 355–365.

    Horn, H. -G. & Visser, G.J. (1991) Basic data on the biology of monitors. Mertensiella, 2, 176–187.

    King, D.J. & Green, B. (1993a) Goanna: The Biology of Varanid Lizards. New South Wales University Press, Sydney, New South Wales, 116 pp.

    King, D.J. & Green, B. (1993b) Family Varanidae. In: Glasby, C.J., Graham, G.J.B. & Beesley, P.L. (Eds.), Fauna of Australia: V2a Amphibia and Reptilia. Australian Government Printing Service, Canberra, Australian Capital Territory, pp. 253–260.

    King, D.J. & Rhodes, L. (1982) Sex ratio and breeding season of Varanus acanthurus. Copeia, 1984:784–87.

    Lockhart, P.J., Steel, M.A., Hendy, M.D. & Penny, D. (1994) Recovering evolutionary trees under a more realistic model of sequence evolution. Molecular Biology and Evolution, 11, 605–612.

    Lucas, A.H.S. & Frost, C. (1895) Preliminary notice of certain new species of lizards from central Australia. Proceedings of the Royal Society of Victoria, 7, 264–269.

    Macey, J.R. & Verma, A. (1997) Re: Homology in phylogenetic analysis: alignment of transfer RNA genes and the phylogenetic position of snakes. Molecular Phylogenetics and Evolution, 7, 272–279.

    Mertens, R. (1942) Die Familie der Warane (Varanidae): Zweiter Teil: der Schadel. Abhandlungen der Senckenbergischen Naturforschenden Geselenschaft, 462, 1–116, 465, 117–233, 466, 237–391.

    Nixon, K.C. & Wheeler, Q.D. (1990) An amplification of the phylogenetic species concept. Cladistics, 6, 211–223.

    Pianka, E.R. (1971) Notes on the biology of Varanus tristis. Western Australian Naturalist, 15, 180–183.

    Pianka, E.R. (1995) Evolution of body size: varanid lizards as model system. American Naturalist, 146, 398–414.

    Posada, D. & Crandall, K.A. (1998) Modeltest: testing the model of DNA substitution. Bioinformatics, 14, 817–818.

    Rambaut, A. (1995) Se-Al. Sequence alignment editor. Evolutionary Biology Group, University of Oxford, Oxford, UK.

    Rodriguez, F., Oliver, J.F., Marin, A. & Medina, J.R. (1990) The general stochastic model of nucleotide substitutions. Journal of Theoretical Biology, 142, 485–501.

    Shea, G.M. & Reddacliff, G.L. (1986) Ossification in the hemipenes of varanids. Journal of Herpetology, 20, 566–568.

    Simmons, M.P. & Ochoterena, H. (2000) Gaps as characters in sequence-based phylogenetic analyses. Systematic Biology, 49, 369–381.

    Sprackland, R.G. (1991) The origin and zoogeography of monitor lizards of the subgenus Odatria Gray (Sauria: Varanidae): a re-evaluation. Mertensiella, 2, 240–252.

    Storr, G.M. (1980) The monitor lizards (genus Varanus Merrem, 1820) of Western Australia. Records of the Western Australian Museum, 8, 237–293.

    Storr, G.M., Smith, L.A. & Johnstone, R.E. (1983) Lizards of Western Australia. II. Dragons and Monitors. Western Australian Museum, Perth, Western Australia, 113 pp.

    Swofford, D.L. (2002) PAUP*. Phylogenetic analysis using parsimony (*and other methods), version 4 b10. Sinauer Associates, Sunderland, Massachusetts.

    Thompson, G.G. (2004) Varanus caudolineatus. In: Pianka, E.R., King, D.R. & King, R.A. (Eds.), Varanoid Lizards of the World. Indiana University Press, Indiana, pp. 318–327.

    Thompson, G.G. & Thompson, S.A. (2002). Clutch of Varanus caudolineatus (Varanidae). Western Australian Naturalist, 23, 228.

    Thompson, G.G. & Withers, P.C. (1997) Comparative morphology of Western Australian varanid lizards (Squamata: Varanidae). Journal of Morphology, 233, 127–152.

    Ziegler, T. & Böhme, W. (1997) Genitalstrukturen und Paarungsbiologie bei squamaten Reptilien, speziell den Platynota, mit Bemerkungen zur Systematik. Mertensiella, 8, 1–210.