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At 2:00 PM +0100 8/21/02, darren.naish@port.ac.uk wrote:
Steve asked....

Sometime ago (years, that is) I read an article in Discover
magazine (I think) about therapsid predators who seemed to
have hollow fangs and may have been venomous. I've never
seen this mentioned since, so I was wondering if anybody
could provide any information on the actuality of this.

A possibly venomous theropod based on a tooth from Baja California was described at the SVP meeting in 2000. Here's a draft of what I wrote for New Scientist at the time:

ID: Venomous theropod

A tooth from Baja California hints that venomous dinosaurs may have lived outside the fictional Jurassic Park. The two-centimeter tooth contains a longitudinal groove like those in the venom-carrying teeth of snakes, two Mexican paleontologists reported late last month at a meeting of the Society for Vertebrate Paleontology in Mexico City.

No other evidence of venomous dinosaurs has ever been discovered. The small poison-spitting predators of Jurassic Park were based on real dinosaurs called dilophosaurs, but their venom was fictional.

The curved blade-like tooth came from a small "theropod" dinosaur, the family of two-legged predators that included Velociraptor and Tyrannosaurus rex. "The general features of this tooth could be found in most theropod taxa," says Francisco Aranda-Manteca of the University of Baja California in Enselada. However, the groove-like structure is unique among dinosaurs. Aranda-Manteca says it resembles structures in the venom-delivering teeth of snakes and the two extant groups of poisonous (helodermatid) lizards -- the Gila monster and the Mexican beaded lizard. Neither group is closely related to dinosaurs, whose closest living relatives are birds and crocodiles.

So far, paleontologists have identified only one isolated tooth, missing its tip, in rocks 70 to 80 million years old. Measuring 5.6 by 9.5 millimeters at its base, the tooth could have come from several types of theropods, but lacks distinctive features found in others, such as tyrannosaurs, which are among the few other dinosaurs known from the same deposits.

Other paleontologists at the meeting were intrigued, but share the caution of Aranda-Manteca and his colleague Ruben Rodriguez-de la Rosa. "It is not unquestionable evidence of venomous theropods," says Tom Holtz of the University of Maryland in College Park. "However, it does have an inverted serration pattern and groove down the back edge of the tooth, and indeed other animals which have a groove in that position are known to be poisonous."
Jeff Hecht, science & technology writer
jeff@jeffhecht.com; http://www.jeffhecht.com
Boston Correspondent: New Scientist magazine
Contributing Editor: Laser Focus World, WDM Solutions
525 Auburn St., Auburndale, MA 02466 USA
v. 617-965-3834; fax 617-332-4760