#nostolepis

[kiabugboy]

Inversoceras hides in its shell until the curious Nostolepis gives up and decide to leave it alone

Alt: Inversoceras is a straight slightly curved shelled nautiloid with a narrow opening for its face in front and siphon at the back, here it's being bitten by a Nostolepis, an acanthodian which are the so called spiny sharks even though they're not true sharks. Nostolepis has shark like dorsal and side fins but with spikes at the front