genus Spirula


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Noun1.genus Spirula - genus of small cephalopods with many-chambered spiral shells resembling those of the extinct belemnites
mollusk genus - a genus of mollusks
family Spirulidae, Spirulidae - coextensive with the genus Spirula; included in the order Belemnoidea in some older classifications
spirula, Spirula peronii - a small tropical cephalopod of the genus Spirula having prominent eyes and short arms and a many-chambered shell coiled in a flat spiral
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