"silvestrosaurus" is very similar to its close relative "lariosaurus" (see above) but there are enough differences for most people to assign them to different genera. the nasal has no contact with the prefrontal, separated by processes of the frontal and maxilla, and many parts of the skull, such as the parietal and postfrontal bones, are much broader and flatter than in "lariosaurus." the clavicles do not meet in an anteromedial suture, unlike in "lariosaurus." in "silvestrosaurus" the radius is slightly longer than the ulna, but in "lariosaurus" they are the same length or the radius is shorter. as the back half of the skeleton is missing, we cannot compare the number of vertebrae. nor can we compare the hindfeet to see if "silvestrosaurus" had paddles like "ceresiosaurus" rather than individual toes like "lariosaurus." however, the front limbs definitely had paddles. "silvestrosaurus" was only around 60–70 cm long as an adult, making it relatively small for a nothosaur.