Requested reference
Kaston, B. J. (1963b). Abnormal duplication of the epigynum and other structural anomalies in spiders. Transactions of the American Microscopical Society 82(2): 220-223. doi:10.2307/3223998 
-- Show included taxa
Kaston, B. J. (1963b). Abnormal duplication of the epigynum and other structural anomalies in spiders. Transactions of the American Microscopical Society 82(2): 220-223. doi:10.2307/3223998 -- Show included taxa