Chesher, R. H. (1968). The systematics of sympatric species in West Indian spatangoids: a revision of the genera Brissopsis. Plethotaenia, Paleopneustes and Saviniaster. Studies in Tropical Oceanography. 7: 1-168.
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Chesher, R. H.
1968
The systematics of sympatric species in West Indian spatangoids: a revision of the genera Brissopsis
Plethotaenia, Paleopneustes and Saviniaster. Studies in Tropical Oceanography