Pedinoida
Pedinoida (class Echinoidea, superoder Diadematacea) An order of regular echinoids, of subconical to depressed hemispherical shape, which have simple or compounded, diadematoid, ambulacral plates, and shallow slits notching the peristomal margin for the passage of gills. They first appeared in the Triassic.
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Qattara Depression Meatus , meatus (mee-ay-tŭs) n. (in anatomy) a passage or opening. external auditory m. the auditory canal: the passage leading from the pinna of the outer ea… Northwest Passage , Northwest Passage, water routes through the Arctic Archipelago, N Canada, and along the northern coast of Alaska between the Pacific and Atlantic oce…
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Pedinoida