Sphenovipera jimmysjoyi is an extinct species of sphenodontian dated from the Middle Jurassic.

[1][2] If was discovered in the lower part of the La Boca Formation located in Tamaulipas, Mexico.

The authors of the describing study stated that mandible and has several characteristics indicative of venom delivery.

This includes large curved fangs with grooves seen in other animals that use low-pressure venom delivery, such as colubrid snakes.

The authors of the describing study also suggested that the gape was wider and the bite was weaker than that of other sphenodontians.