(public display, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, USA)
Nautiloids are squids-in-shells. In the Paleozoic, many forms had a straight shell, but some had loosely coiled or tightly coiled shells. Nautiloids are still alive today, but only represented by a small number of species in modern oceans - all have tightly coiled shells.
Seen here is Eutrephoceras, an extinct nautiloid with a tightly coiled shell. This genus existed from the Mesozoic to the Tertiary.
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