Phylogenetic Relationships of Terrestrial Australo-Papuan Elapid Snakes (Subfamily Hydrophiinae) Based on Cytochrome B and 16S Rrna Sequences J
MOLECULAR PHYLOGENETICS AND EVOLUTION Vol. 10, No. 1, August, pp. 67–81, 1998 ARTICLE NO. FY970471 Phylogenetic Relationships of Terrestrial Australo-Papuan Elapid Snakes (Subfamily Hydrophiinae) Based on Cytochrome b and 16S rRNA Sequences J. Scott Keogh,*,†,1 Richard Shine,* and Steve Donnellan† *School of Biological Sciences A08, University of Sydney, Sydney, New South Wales 2006, Australia; and †Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia Received April 24, 1997; revised September 4, 1997 quence data support many of the conclusions reached Phylogenetic relationships among the venomous Aus- by earlier studies using other types of data, but addi- tralo-Papuan elapid snake radiation remain poorly tional information will be needed before the phylog- resolved, despite the application of diverse data sets. eny of the Australian elapids can be fully resolved. To examine phylogenetic relationships among this 1998 Academic Press enigmatic group, portions of the cytochrome b and 16S Key Words: mitochondrial DNA; cytochrome b; 16S rRNA mitochondrial DNA genes were sequenced from rRNA; reptile; snake; elapid; sea snake; Australia; New 19 of the 20 terrestrial Australian genera and 6 of the 7 Guinea; Pacific; Asia; biogeography. terrestrial Melanesian genera, plus a sea krait (Lati- cauda) and a true sea snake (Hydrelaps). These data clarify several significant issues in elapid phylogeny. First, Melanesian elapids form sister groups to Austra- INTRODUCTION lian species, indicating that the ancestors of the Austra- lian radiation came via Asia, rather than representing The diverse, cosmopolitan, and medically important a relict Gondwanan radiation. Second, the two major elapid snakes are a monophyletic clade of approxi- groups of sea snakes (sea kraits and true sea snakes) mately 300 species and 61 genera (Golay et al., 1993) represent independent invasions of the marine envi- primarily defined by their unique venom delivery sys- ronment.
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