Eckelbarger, Kevin J. and Grassle, J.P. 1987. Interspecific variation in genital spine, sperm, and larval morphology in six sibling species of Capitella. Bulletin of the Biological Society of Washington 7: 62-76.
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Eckelbarger, K. J.; Grassle, J. P.
1987
Interspecific variation in genital spine, sperm, and larval morphology in six sibling species of Capitella