Miocene molluscs

Spirula spirula is a species of deep-water squid-like cephalopod mollusk. It is the only extant member of the genus Spirula, the family Spirulidae, and the order Spirulida. Because of the shape of its internal shell, it is commonly known as the '''ram's horn squid or the little post horn squid. Because the live animal has a light-emitting organ, it is also sometimes known as the tail-light squid'''.

order of molluscs

thumb|Eutrephoceras dorbignyanum thumb|Eutrephoceras dekayi from the [[Coon Creek Formation]]