As dinosaurs ruled the land during the Late Jurassic, the ammonite genus Kranaosphinctes could be found flourishing in the oceans. Ammonites were a type of cephalopod — the taxonomic class that includes today's nautilus, octopus, and squid. Much like a submarine, ammonites employed gas- and liquid-filled chambers to regulate their position in the water column. The animal itself lived only in the outermost compartment, employing its tubular siphuncle to connect its chambers alon🙈g the shell's ventral surface.