Arborescent - having the size, form, or characteristics of a tree. Angular - having a bony structure. Anterior - located near the head in lower animals. Aperture - an opening, as a hole, gap, or slit. Benthos - bottom of sea or lake. Branchial - a breathing organ, as a gill. Concentric - having a common center. Cyst - a capsulelike membrane or certain organisms in a resting stage. Dorsal margin - referring to the top part of the shell where the hinge is located. Elongate - long or extended. Extirpated - locally extinct. Glochidia - a parasitic larva of certain freshwater mussels with hooks for attaching to a host fish. Gravid - pregnant. Homogeneous - of the same or similar nature or kind. Impoundment - to accumulate (water) in a reservoir. Incurrent - permitting passage to an inflowing current. Malacology - scientific study of molluscs. Mantle - a membrane between the body and shell of a mollusk or brachiopod. Marsupium - a temporary egg pouch. Midden - piles of freshly cleaned mussels. Papillae - a small nipplelike projection. Postbasal - bottom left of a mussel. Posterior - situated behind a part or toward the rear of a structure. Siphon - a tubular organ of aquatic invertebrates, by which water is taken in or expelled. Sporadic - occuring at irregular intervals, having no pattern or order. Substrates - a surface on which a plant or animal grows or is attached. Sulcate - having narrow logitudinal indentations. Sulcus - a deep narrow furrow or groove. Tubercles - a nodule or swelling. Ventral margin - the edge near the belly of a mussel.
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