Urechinidae

Urechinidae

[‚yu̇r·ə′kin·ə‚dē]
(invertebrate zoology)
A family of echinoderms in the order Holasteroida which have an ovoid test lacking a marginal fasciole.
References in periodicals archive ?
The two families of Holasteroida known from antarctic waters, the Urechinidae and the Pourtalesiidae, are essentially deep-sea forms with a wide distribution in the ocean basins.
The Echinoneidae, Nucleolitidae, Urechinidae, Echinocorythidae, Calymnidae, Pourtalesiidae, Palaeostomatidae, Aeropsidae, Palaeopneustidae, Hemiasteridae and Spatangidae.