Abstract
Summary Accessory cell patterns were examined in the male gonads of the holothurians Apostichopus japonicus, Cucumaria japonica and Eupentacta fraudatrix. A. japonicus has a different type of somatic cell from the other two species. The general morphology of accessory cells is quite similar in C. japonica and E. fraudatrix, but there is a significant difference in the number of these cells in the germinative epithelium in these species. The possibility that individual features of accessory cell populations can be useful as an additional taxonomic character is discussed.
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