Spatangoidea

Spat`an`goi´de`a


n. pl. 1. (Zool.) 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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Agassiz) (Spatangoidea) and Stylocidaris lineata (Mortensen) (Cidaroidea), bathyal echinoids from the Bahamian slope.
Larval development and metamorphosis of the deep-sea Cidaroid urchin Cidaris blakei
The biology of Echinocardium cordatum (Echinodermata: Spatangoidea) from different habitats.
The seasonal movement and abundance of the starfish, Asterias rubens in relation to mussel farming practice: a case study from the Menai Strait, UK
The presence of a posterior process and posterodorsal arms makes the larva of Aspidodiadema jacobyi much more similar to larvae of irregular urchins in the order Spatangoidea than to other families of the order Diadematoida, to which the family i s normally assigned.
Larval Development of the Tropical Deep-Sea Echinoid Aspidodiadema jacobyi: Phylogenetic Implications