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Figure 1
Schematic of the midshaft section of a tooth of Lytechinus variegatus. The keel fragment came from a position like that outlined by the dashed line, and b denotes the base of the keel. |
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Figure 1
Schematic of the midshaft section of a tooth of Lytechinus variegatus. The keel fragment came from a position like that outlined by the dashed line, and b denotes the base of the keel. |