>>I´m wondering if ALL the genus of the subfamily Xenodontinae are opistoglyphous.
>>For example, are the snakes of the genus Liophis, Lystrophis and Waglerophis, opistoglyphous?!

The term opisthoglyph is really fairly meaningless, in the sense that there are a large number of different dental configurations, and they can vary even within a genus. Lumping all dentitions with grooves under one term and those without under another is fairly pointless.

Within the Xenodontinae, there are species with and without grooves on their posterior maxillary teeth, but most if not all have a venom gland, as you would expect.

Cheers,

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