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(a) Arrangement of small, medium, and large bristles on Alviniconcha shells; (b) percentage of bristles arrangement categories observed in each Alviniconcha species. Different categories of bristle arrangements may be encountered on the shell of a given specimen depending on the row considered, which are noted ab, bcd, etc. to account for such heterogeneity; (c) example of bristle arrangement for an individual of Alviniconcha kojimai.
