Thread:Animalman57/@comment-33613830-20180110005141/@comment-6025261-20180110010959

Dinosaurus1 wrote: But not in the description, does it?

Basically, up to that point, people wouldn't have even known that Elaphrosaurus lacked a skull, based on the preserved skeleton. Here's where it is (in bold for you):

Jurassic Park Series
Elaphrosaurus never appears in the original novels or movies. However, a silhouette of Elaphrosaurus is shown on the Holoscape screen in the Innovation Center of Jurassic World, though it is currently unknown if any reside within the park itself.

It does appear, however, in Topps comics (the head of which is entirely speculative, as no skull has been preserved for this genus).