lunule
lunule
1. In Bivalvia, a depressed plane or curved area along the hinge line, anterior to the umbo. Compare ESCUTCHEON.
2. ‘Keyhole-like’ perforations in the tests of many flat clypeasteroid (sand dollar) Echinoidea.
1. In Bivalvia, a depressed plane or curved area along the hinge line, anterior to the umbo. Compare ESCUTCHEON.
2. ‘Keyhole-like’ perforations in the tests of many flat clypeasteroid (sand dollar) Echinoidea.
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