Aspidomorphus

Abstract: The genus Cacophis, comprising four species endemic to eastern Australia, is uniquely derived among terrestrial Australasian elapid snakes in the temporal scale pattern, presence of a relatively high and narrow dorsal crest (‘choanal process’) on the palatine bone, and presence of keeled supra-anal scales in adult males. Recent analyses based on morphology and genetics do not completely resolve relationships among Australasian elapids, but support relationships of Cacophis with the (Furina, Glyphodon) and (Aspidomorphus, Demansia) clades, which are adopted here as outgroups for intrageneric analysis. Within Cacophis, morphoclines in size, head scalation, tooth numbers and colour patterns indicate that C. squamulosus is the sister-group to the remaining three species; among the latter, there is conflicting evidence for both ( harriettae, krefftii) and (churchilli, krefftii) clades, but the latter alternative has greater support. Revised diagnoses are given for the genus and included clades, and a simple phylogeographic model proposed.

Abstract: . We studied for the first time a collection of 377 snakes assembled by Benoit Mys and Jan Swerts in Papua New Guinea (PNG) during 1982–85. The collection, stored at the Royal Belgian Institute of Natural Sciences (RBINS), contains specimens collected in rapid assessments of 45 mainland and island localities in Madang, East Sepik, West Sepik, and Morobe Provinces, and 8 localities from West New Britain and Manus Provinces. Thirty-three species from six families (Acrochordidae, Boidae, Colubridae, Elapidae, Pythonidae, Typhlopidae) were present in the collection, and we report a number of new morphological observations from unidentified Dendrelaphis, Tropidonophis, and Aspidomorphus, as well as from Stegonotus cf. parvus. We report 31 new island records for snakes. Combined with island distributional information extracted from literature and museum collections, we provide an updated overview of snake species occurrences on the islands off the north coast of PNG. The substantial contribution of a 30...

Abstract: The Australian snakes that have been included in Aspidomorphus differ markedly from that genus, particularly in hemipenial morphology and in the absence of a muscular slip from the quadrate bone to the venom gland; the genus Aspidomorphus is therefore restricted to the New Guniea species. Aspidomorphus (as here restricted) is closely related to Demansia (in the restricted sense of Worrell, essentially D. psammophis, D. torquata, and D. olivacea), but the Australian species generally referred to Aspidomorphus seem to be related to Glyphodon. The genera Aspidomorphus, Demansia, Rhinhoplocephalus and Drepanodontis form a natural group. Aspidomorphus contains three species, each identifiable by hemipenial features as well as by details of colouration: A. muelleri (=A. mulleri mulleri and A. m. interruptus of Brongersma's revision); A. lineaticollis (=A. mulleri lineaticollis and A. m. lineatus of Brongersma); and A. schlegeli. The last species differs from the others in the form of the maxillary bone and the anterior mandibular dentition; it seems to be confined to northwestern New Guinea and adjacent islands, since specimens from the eastern end of New Guinea that had been referred to schlegeli are actually A. lineaticollis. In all three species some geographical variation can be demonstrated, at least in ventral count, but it is not considered necessary to use trinomials to indicate that geographical variation exists. Pseudonaja textilis is recorded from New Guinea for the first time. (McDowell.) Examination reveals Demansia ornaticeps is properly referred to Demansia. (Cogger.)

Abstract: One of the most prolific radiations of venomous snakes, the AustraloMelanesian Hydrophiinae includes 100 species of Australasian terrestrial elapids plus all 60 species of viviparous sea snakes. Here, we estimate hydrophiine relationships based on a large data set comprising 5800 bp drawn from seven genes (mitochondrial: ND4, cytb, 12S, 16S; nuclear: rag1, cmos, myh). These data were analysed using parsimony, likelihood and Bayesian methods to better resolve hydrophiine phylogeny and provide a timescale for the terrestrial and marine radiations. Among oviparous forms, Cacophis, Furina and Demansia are basal to other Australian elapids (core oxyuranines). The Melanesian Toxicocalamus and Aspidomorphus group with Demansia, indicating multiple dispersal events between New Guinea and Australia. Oxyuranus and Pseudonaja form a robust clade. The small burrowing taxa form two separate clades, one consisting of Vermicella and Neelaps calanotus, and the other including Simoselaps, Brachyurophis and Neelaps bimaculatus. The viviparous terrestrial elapids form three separate groups: Acanthophis, the Rhinoplocephalus group and the Notechis–Hemiaspis group. True sea snakes (Hydrophiini) are robustly united with the Notechis–Hemiaspis group. Many of the retrieved groupings are consistent with previous molecular and morphological analyses, but the polyphyly of the viviparous and burrowing groups, and of Neelaps, are novel results. Bayesian relaxed clock analyses indicate very recent divergences: the 160 species of the core Australian radiation (including sea snakes) arose within the last 10 Myr, with most inter-generic splits dating to between 10 and 6 Ma. The Hydrophis sea snake lineage is an exceptionally rapid radiation, with > 40 species evolving within the last 5 Myr.