Terebratellidina (class Articulata, order Terebratulida) A suborder of Brachiopoda whose members have a calcareous loop formed by an outgrowth from both crura (see CRUS) and the median septum. They appeared first in the Devonian. The suborder comprises three superfamilies, of which only one (Terebratellacea) is extant.
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