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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..

Regularia :: Regularia (n. pl.) A division of Echini which includes the circular, or regular, sea urchins..

Siphon :: Siphon (n.) A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.

Semita :: Semita (n.) A fasciole of a spatangoid sea urchin.

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

Sea Urchin :: Sea urchin () Any one of numerous species of echinoderms of the order Echinoidea.

Repkie :: Repkie (n.) Any edible sea urchin.

Petalosticha :: Petalosticha (n. pl.) An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid..

Auricula :: Auricula (n.) One of the five arched processes of the shell around the jaws of a sea urchin.

Sea Egg :: Sea egg () A sea urchin.

Coronal :: Coronal (a.) Of or pertaining to the shell of a sea urchin.

Corona :: Corona (n.) The shelly skeleton of a sea urchin.

Regular :: Regular (a.) Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin..

Echinus :: Echinus (n.) A genus of echinoderms, including the common edible sea urchin of Europe..

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Aristotle's Lantern :: Aristotle's lantern () The five united jaws and accessory ossicles of certain sea urchins.

Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

Sphaeridium :: Sphaeridium (n.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ..

Urchin :: Urchin (n.) A sea urchin. See Sea urchin.

Scrobicula :: Scrobicula (n.) One of the smooth areas surrounding the tubercles of a sea urchin.

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