>>I dont know about lystrophis, but liophis and waglerophis are aglyphous, but waglerophis have enlarged fangs in back that do not conducts venom(heterodontia).

Both those genera have bloody big back fangs. The terms 'aglyphous' and 'opisthoglyphous' are pretty meanless and certainly don't reflect the reality. Basically, the ancestral colubroid snake not only had venom glands but also maxillary fangs. Not huge in either case but there. From that point, for the last eight million years ago or so, the snakes have been tinkering with it. This has been going on in families that in some cases represent very ancient splits. We have been comparing the venoms across these family levels and its been pretty fascinating.

Cheers
Bryan
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Dr. Bryan Grieg Fry
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Australian Venom Research Unit,
University of Melbourne
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Population and Evolutionary Genetics Unit,
Museum Victoria
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http://www.venomdoc.com

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