Hemicidaroida
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Upper Class , upper class Conventionally the upper class is often thought of as equivalent to the ‘aristocracy’: that is, the (often hereditary) noble class, compr… Euechinoidea , Euechinoidea (class Echinoidea) Sub-class of sea-urchins in which the normally rigid test is composed of five ambulacra and five interambulacra, each… Upper , up·per1 / ˈəpər/ • adj. 1. situated above another part: his upper arm the upper atmosphere. ∎ higher in position or status: the upper end of the soci… Thecodontia , Thecodontia (thecodonts) ‘Tooth-in-socket’ reptiles, and the most primitive order of the Archosauria (‘ruling reptiles’), ranging from the Upper Perm… primary , primary •beery, bleary, cheery, dearie, dreary, Dun Laoghaire, eerie, eyrie (US aerie), Kashmiri, leery, peri, praemunire, query, smeary, teary, theo… Irregulares , Irregulares (Anthocyathea; phylum Archaeocyatha) Class of solitary, rarely colonial invertebrate animals found in Lower, Middle, and Upper Cambrian r…
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Hemicidaroida