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Chia, D.G.B.; Ng, P.K.L. (1999). A revision of Eumedonus H. Milne Edwards, 1834 and Gonatonotus White, 1847 (Crustacea: Decapoda: Brachyura: Eumedonidae), two genera of crabs symbiotic with sea urchins. Journal of Natural History. 34(1): 15-56.