TN00341 ROUGH PIGTOE PEARLY MUSSEL PLEUROBEMA PLENUM
TN00341PHYSICAL DESCRIPTION: SHELL IS MEDIUM-SIZED, SUBTRIANGULAR IN OUTLINE AND INFLATED, VALVES ARE INEQUILATERAL AND SOLID WITH VERY FULL AND HIGH BEAKS WHICH ARE TURNED FORWARD, BEAK SCULPTURE CONSISTS OF A FEW IRREGULAR NODULOUS RIDGES, ANTERIOR END IS SHARPLY TRUNCATED WHILE THE DORSAL MARGIN IS SLIGHTLY CURVED, VENTRAL MARGIN IS ROUNDED AND POSTERIOR MARGIN IS ALMOST STRAIGHT, OFTEN WITH A SLIGHT SINUS BEFORE THE POSTERIOR RIDGE, THE POSTERIOR RIDGE IS NARROWLY ROUNDED, ENDING IN A BLUNT POINT, MEDIAN RIDGE IS HIGH, WIDE AND ROUNDED, BEING SEPARATED FROM THE POSTERIOR RIDGE BY A RADIAL DEPRESSION, SURFACE IS MARKED BY IRREGULAR GROWTH LINES, EPIDERMIS IS SATIN-LIKE AND YELLOWISH BROWN TO A REDDISH BROWN IN COLOR, EPIDERMIS MAY BE UNRAYED OR HAVE A SERIES OF FINE DARK GREEN LINES OVER THE POSTERIOR HALF OF THE SHELL OR UMBO, THESE OFTEN BECOME OBLITERATED WITH AGE, LEFT VALVE HAS TWO SCULPTURED, RADIATE PSEUDOCARDINAL TEETH SEPARATED FROM TWO SHORT THICK LATERAL TEETH BY A BROAD INTERDENTUM, RIGHT VALVE HAS ONE LARGE STRIATED PSEUDOCARDINAL TOOTH, OFTEN WITH A SMALL TOOTH BEFORE AND BEHIND, LATERAL TOOTH IN THE RIGHT VALVE MAY BE SINGLE OR HAVE A SECOND REDUCED TOOTH, MAKING THE LATERAL TOOTH APPEAR DOUBLE, BEAK CAVITY IS DEEP AND COMPRESSED, MUSCLE SCARS ARE SMALL AND DEEPLY IMPRESSED, THE ANTERIOR SCARS BEING SCULPTURED, NACRE COLOR VARIES FROM WHITE TO PINK AND BECOMES IRIDESCENT POSTERIORLY *TN5587* REPRODUCTION: GLOCHIDEA ARE SEMI-CIRCULAR *TN5600*, GRAVID FEMALES OBSERVED IN MAY, SO SPECIES IS TACHYTICTIC *TN5599*
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