#oncocerid

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

Alt: Plemeroceras is a conical straight shelled Oncocerid with a narrow face opening with a forward facing opening where the face would've protruded out of, and a back facing smaller opening presumably for its siphon

Alt: a large (8 cm) Oncocerid, Jeppsonoceras with a straight teardrop shaped shell, bumps into a smaller Pentameroceras with slightly curved teardrop shaped shell and a narrow asterisk * shaped opening

Alt: Trimeroceras is an Oncocerid, a nautiloid with a potato shaped shell and lowercase t shaped opening at the bottom of the shell were its cephalopod face protrudes from, the background is of a blue ocean water, behind it is a blurred out Eucalyptocrinites common in the Gotland Silurian reef