These shells come from a kind of cephalopod called Spirula spirula, or the ram’s horn squid (among the 27 or so families of “squids”). It has an internal, loosely coiled shell with septa. But hardly anyone knows about it because it lives in the deep sea. Sometimes after a ram’s horn squid dies, its shell floats to the surface and washes up on a beach. We don’t know how this squid fits into the cephalopod tree of life, but it’s fun to imagine it as an animal unchanged over time patrolling modern oceans!
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