A new genus is established for distinct freshwater species from the Indo-Pacific region, suggesting unique evolutionary traits.
A group of freshwater species, i.e., Caridina gracilirostris, C. gracillima, C. neglecta, C. longifrons, C. wilsoni and C. leptopoda, widely distributed in the Indo–Pacific region, has been found to exhibit several distinct and unique morphological characters, and genetically forms a monophyletic group together with C. thomasi, which is well separated from other species/species groups of the genus Caridina sensu stricto. A new genus is thus established for this group of species. The present paper provides diagnosis of Gracidina gen. nov., with a key to all species assigned to it. Diagnosis, taxonomic discussions, habitat and distribution information for all species are provided.
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Yixiong Cai (2026) studied this question.
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