Image of ram's horn shell

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Spirulida Stolley 1919

Decapodida; Neocoleoidea; Spirulidae; Spirulida; Spirula (ram's horn shell); Decapodiformes; Coleoidea (coleoids); Cephalopoda (cephalopods); Mollusca (molluscs); Spiralia (spiralians); Protostomia (protostomes); Bilateria; Opisthokonta (opisthokonts); Metazoa (Animal); Cellular (cellular organisms); Life (creatures); Eukaryota (eukaryotes)