TN00461 SHINY PIGTOE PEARLY MUSSEL FUSCONAIA COR
TN00461PHYSICAL DESCRIPTION: VALVES RANGE FROM SUBSOLID TO SOLID AND ARE INEQUILATERAL, BEAKS HIGH, FULL AND TURNED FORWARD, SITUATED ANTERIOR TO THE MIDDLE OF THE SHELL, ANTERIOR END OF SHELL IS OBLIQUELY TRUNCATED ABOVE AND ROUNDED BELOW, POSTERIOR END SLIGHTLY CURVED FROM THE HINGE LIGAMENT TO THE VENTRAL MARGIN, VENTRAL MARGIN NEARLY STRAIGHT, BUT CURVES UPWARD IN FRONT, POSTERIOR RIDGE NARROWLY ROUNDED OR ANGULAR, SOMETIMES DOUBLE, ENDING IN A POINT OR BIANGULATION AT THE BASE, ANTERIOR TO THE POSTERIOR RIDGE THERE IS A MARKED WIDE RADIAL SWELLING, DIAMETER OR WIDTH OF SHELL IS THICKEST AT THIS POINT, SHELL SURFACE MARKED BY UNEVEN GROWTH LINES, PERIOSTRACUM GREENISH-YELLOW OR YELLOWISH-GREEN, OFTEN BECOMING DARK BROWN TO BLACK IN OLDER SPECIMENS, YOUNG SHELLS GENERALLY HAVE BOTH WIDE AND NARROW BROKEN GREENISH RAYS WITH A PERIOSTRACUM THAT IS VERY SHINY, OLDER SPECIMENS BECOME DULL, DARKER IN COLOR AND RAYS BECOME INDISTINCT, BEAK SCULPTURE CONSISTS OF A FEW, STRONG, BROKEN SUBNODULOUS RIDGES APPARENT ONLY IN VERY YOUNG INDIVIDUALS, ARE 2 IRREGULAR, ROUGH PSEUDOCARDINAL TEETH AND 2 STRAIGHT LATERAL TEETH IN THE LEFT VALVE, RIGHT VALVE HAS 3 PSEUDOCARDINALS, THOSE BEFORE AND BEHIND THE LARGE MIDDLE TRIANGULAR TOOTH BEING MUCH REDUCED IN SIZE, IS NORMALLY ONE LATERAL TOOTH, BUT OCCASIONALLY SOME DEVELOP A VESTIGIAL TOOTH BELOW, BEAK CAVITIES COMPRESSED AND RATHER DEEP, NACRE COLOR WHITE, BOTH ADDUCTOR MUSCLE SCARS SMALL AND WELL- IMPRESSED, PALLIAL LINE IS DISTINCT ONLY ANTERIORLY, THE DOWN RIVER SPECIES COR IS MODERATELY HEAVY AND INFLATED, WHILE THE HEADWATERS FORM ANALOGA IS MORE COMPRESSED *TN5587* REPRODUCTION: GRAVID DURING MID-MAY AND FIRST TWO WEEKS OF JUNE *TN5587*
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