Pleistacantha ori is a species of spider crab found in Madagascar and the east coast of South Africa at depths of . It resembles Pleistacantha moseleyi and Pleistacantha pungens.
Description Pleistacantha ori has a pyriform carapace which is longer than it is wide when excluding the rostrum. It is the largest species of Pleistacantha, and the male holotype's carapace measures long excluding the rostrum and wide.
Taxonomy Pleistacantha ori was named in honour of the Oceanographic Research Institute (ORI) in Durban, South Africa.
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