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Bivalvia - Pectinida - Spondylidae
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|Packard 1922 (Spondylus striatus)||Shell very large, nearly oval in outline; inequivalve; beak of right valve small and pointed, that of the left valve apparently large and irregular. Anterior dorsal margin nearly straight but curving below the ear to meet the even curve of the base; posterior margin slightly concave near the beaks . Anterior ear of the right valve about 36 millimeters long. Shell of right valve about 10 millimeters thick, that of the left valve being somewhat thinner, due in part to a pitted condition of the surface apparently produced by a marine organism. Right valve ornamented by a large number of fine radiating ribs, which are ridged longitudinally and tend to become nodose toward the base of the shell. The lower (left) valve rugose, and apparently not so distinctly ribbed. Hinge and interior of the shell unknown . Length of type, 115 mm .; height, 145 mm.; diameter, 75 mm.|
|E. L. Packard 1922||Shell very large, nearly equivalve; anterior dorsal margin sloping in a straight line from the beaks to a point about midway from the beaks to the base. Anterior end evenly rounded; base arcuate; posterior dorsal margin apparently curves convexly from the small beak toward the posterior extremity, which appears to be broken. Anterior ear long, the dorsal margin sloping slightly; posterior ear broken. Surface of the valve ornamented by numerous fine ribs becoming obscured toward the base by radial rows of nodes on some of the stronger ribs. These nodes extend from 3 to 5 millimeters above the surface from which they rise. Length of type, 140 mm.; height, 150 mm.; convexity, 30 mm.