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Definition of COLEOPTILE. : the first leaf of a monocotyledon forming a protective sheath about the plumule.
A brachidium, a lophophore support, visible between the valves of the Early Jurassic (Pliensbachian) brachiopod Spiriferina rostrata (35 x 30 mm). An example of an extinct lophophorate: a Devonian microconchid (Potter Farm Formation, Alpena, Michigan).he lophophore surrounds the mouth and is an upstream collecting system for suspension feeding. Its tentacles are hollow with extensions of a coelomic space thought to be a mesocoel.