TN00338 WHITE WARTY-BACK PEARLY MUSSEL PLETHOBASUS CICATRICOSUS
TN00338PHYSICAL DESCRIPTION: SHELL IS THICK AND SOLID AND VALVES ARE MODERATELY INFLATED, GENERAL SHELL OUTLINE RANGES FROM SUBTRIANGULAR TO ELONGATE OR ALMOST SUBQUADRATE WITH THE BEAKS HIGH, FULL AND TURNED FORWARD OVER A LUNULE, DORSAL MARGIN IS ALMOST STRAIGHT, THE POSTERIOR AND VENTRAL MARGINS EVENLY ROUNDED, POSTERIOR RIDGE IS LOW AND NARROWLY ROUNDED TO ALMOST TRUNCATED, SURFACE IS MARKED BY UNEVEN CONCENTRIC GROWTH LINES AND A ROW OF LOW IRREGULAR KNOBS, BEGINNING JUST BEHIND THE UMBO AND EXTENDING DIAGONALLY DOWN ACROSS THE DISC OF THE SHELL TO THE VENTRAL MARGIN, EPIDERMIS IS A DULL RAYLESS YELLOW OR GREENISH-YELLOW, BECOMING YELLOWISH BROWN IN OLD INDIVIDUALS, LEFT VALVE HAS TWO SCULPTURED PSEUDOCARDINAL TEETH SEPARATED FROM TWO SHORT THICK SLIGHTLY CURVED LATERAL TEETH BY A RELATIVELY BROAD INTERDENTUM, RIGHT VALVE HAS A SINGLE TRIANGULAR SCULPTURED PSEUDOCARDINAL TOOTH AND A SINGLE SHORT SLIGHTLY CURVED LATERAL TOOTH, LONG AXIS OF THE PSEUDOCARDINAL TOOTH IN THE RIGHT VALVE IS SLIGHTLY ANGLED OFF FROM BEING PARALLEL WITH THE LATERAL TOOTH, ANTERIOR MUSCLE SCARS ARE DEEP AND SCULPTURED, WHILE THE POSTERIOR SCARS ARE SHALLOW, THE BEAK CAVITY IS BROAD AND SHALLOW, THE NACRE IS WHITE AND IRIDESCENT POSTERIORLY *TN5587* REPRODUCTION: SPECIES IS INFERRED TO BE TACHYTICTIC *TN5587*
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9286
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