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Spirula spirula AKA ram's horn squid. It has an important evolutionary relic - an internal spiral shell. It also has a yellowish-green photophore at the … | Koning
Field Museum - Spirula spirula, or the ram's horn squid, lives in the deep sea. Sometimes after the squid dies, its shell floats to the surface and washes ashore. | Facebook
Spirula - Animal of the Week - YouTube
File:Spiral shell of ram's horn squid (Spirula spirula), on Muriwai Beach.jpg - Wikimedia Commons