In a message dated 7/25/01 2:39:30 PM EST, smithjb@sas.upenn.edu writes: << Yeah, as far as I know, the holotype of _S. aegypticaus_ was supposed to be sub-adult. >> As I recall, the reason for this was that the neural spines were incompletely fused to the centra. You can see they're detached in a number of Stromer's illustrations of the vertebrae.