English definition of Spatangoidea

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Definition of spatangoidea

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Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

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Spatangoid :: Spatangoid (n.) One of the Spatangoidea.

Spatangoid :: Spatangoid (a.) Of or pertaining to the Spatangoidea.

Spatangus :: Spatangus (n.) A genus of heart-shaped sea urchins belonging to the Spatangoidea.

Fasciole :: Fasciole (n.) A band of minute tubercles, bearing modified spines, on the shells of spatangoid sea urchins. See Spatangoidea..

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..