Spirula spirula, Spirulidae, ram's horn squid, marine invertebrates, molluscs, cephalopods, spirulida, siphuncle, siphuncular cord, washed ashore, Lanzarote Island, Canary Islands, Spain, Atlantic Ocean.

Remarks: Note the tube, called siphuncle, through which passes the siphuncular cord connecting the internal chambers of the shell. The animal uses the siphuncular cord to controls its buoyancy, filling and removing fluids of the chambers.

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