The present study reports on collections of hypogean freshwater atyid shrimps of the genera Caridina Milne Edwards, 1837 Milne Edwards, H. 1837. Histoire naturalle des Crustacés, Comprenant l'Anatomie, la Physiologie et la Classification de ces Animaux, Vol. 2, 1–532. Paris (France): Libraire Encyclopedique de Roret. [Google Scholar] , and Parisia Holthuis, 1956 Holthuis, L. B. 1956. The troglobic Atyidae of Madagascar (Crudtacea, Decapoda, Natantia), Mem Inst Sci Madagascar ser.. A., 11: 97–110. [Google Scholar] , obtained from the karst caves and associated epigean waters of Sulawesi, Indonesia. Six species of Caridina were present, of which two are new to science and one is new to Sulawesi, as well as one new species of Parisia. Types of Caridina pareparensis De Man, 1892 De Man, J. G. 1892. Decapoden des Indischen Archipels.. Zool Ergebn Reise Niederland Ost‐Ind., 2: 265–527. pl. 15–29 [Google Scholar] , and C. pareparensis parvidentata Roux, 1904 Roux, J. 1904. Décapodes d'eau douce de Cèlébes (Genres Caridina et Potamon).. Rev Suisse Zool., 12(3): 539–572. pl. 9 [Google Scholar] , were re‐examined and redescribed; lectotypes for both taxa are designated. Caridina pareparensis parvidentata is here regarded as a distinct species. The new taxa are described, figured and compared with congeners.

The freshwater atyid shrimps of Ryukyu Islands, southern Japan, are documented and discussed. A total of 21 species of freshwater shrimps, belonging to seven genera is reported. Two new species are here described and illustrated in detail. Caridina sakishimensis Fujino and Shokita, 1975 Fujino, T. and Shokita, S. 1975. Report on some atyid shrimps (Crustacea, Decapoda, caridea) from the Ryukyus Islands.. Bulletin of Science and Engineering Division, University of the Ryukyus, (Mathmatics and Natatural Science), 18: 93–113. [Google Scholar] , is synonymized with Caridina prashadi Tiwari and Pillai, 1971 Tiwari, K. T. and Pillai, R. S. 1971. Atyid shrimps of the genus Caridina H. Milne Edwards, 1837, from the Andaman Islands (Decapoda, Caridea).. Crustaceana, 21: 79–91. [Google Scholar] . S.ome previous records are revised, viz. Caridina weberi De Man, 1892a De Man, J. G. 1892a. Decapoda des indischen Archipels.. Zoologische Ergebnisse einer Reise in Niederländisch Ost‐Indien, 2: 265–527, plates 15–29. In: Weber M, ed. [Google Scholar] is referred to C. laoagensis Blanco, 1939 Blanco, G. J. 1939. Four new Philippine species of fresh‐water shrimps of the genus Caridina.. Philippine Journal of Science, 70: 389–395, plates 1–3. [Google Scholar] ; Neocaridina brevirostris reported from Ishigaki Island by Kubo ( 1941 Kubo, I. 1941. On some freshwater shrimpss from the Ryukyu Islands.. Biogeographica, 3: 303–318, plate 1. [Google Scholar] ) is most probably an undescribed species. Caridina hainanensis Liang and Yan, 1983 Liang, X‐Q. and Yan, S‐L. 1983. New species and new records of freshwater shrimps (Crustacea Decapoda) from Hainan Island, China.. Oceanologia et Limnologia Sinica, 14: 211–216. [Google Scholar] , from China and Caridina blancoi Chace, 1997 Chace, F. A Jr. 1997. The Caridean shrimps (Crustacea: Decapoda) of the Albatross Philippine expedition 1907–1910. Part 7: Families Atyidae, Eugonatonotidae, Rhynchocinetidae, Bathypalaemonellidae, Processidae, and Hippolytidae.. Smithsonian Contributions to Zoology, 58: 1–106. [Google Scholar] , from Philippines are also synonymized with Caridina propinqua in the present study.

Re‐examination of the syntypes of Caridina gracilirostris De Man, 1892 De Man, J. G. 1892. “Decapoden des Indischen Archipels.”. In Zoologische Ergebnisse einer Reise in Niederlandisch Ost‐Indien Edited by: Weber, M . Vol. 2, 265–527. Plates 15–29 [Google Scholar] , shows that the type series is composed of three species. These three species are similar in the form of the rostrum, but can be differentiated easily by a combination of rostral formula and sexual appendages. To stabilize the taxonomic status of these species, a lectotype for C. gracilirostris is selected. A lectotype for Caridina appendiculata Jalihal and Shenoy, 1998 Jalihal, D. R. and Shenoy, S. 1998. “Taxonomic revision of some Indian prawn species of genus Caridina H. Milne Edward, 1837 (Atyidae).”. In Proceedings and abstracts of the Fourth International Crustacean Congress, 128–129. Amsterdam, , Netherlands: The Crustacean Socrety. [Google Scholar] , is also designated from among the remaining syntypes of C. gracilirostris. A new species, C. neglecta, is described. Caridina gracilirostris and C. gracilima Lanchester, 1901 Lanchester, W. F. 1901. On the Crustacea collected during the “Skeat” expedition to the Malay Peninsula.. Proceedings of the Zoological Society of London, 1900([1901]): 533–574. [Google Scholar] , are redescribed and figured, and C. appendiculata is transferred to the C. nilotica species group. A new species group is also recognized for C. gracilirostris, C. neglecta, C. gracilima, and a new species, C. longifrons. The C. gracilirostris species group is defined here as taxa possessing a rostrum with subapical teeth, fewer than 10 dorsal teeth, and without any postorbital teeth.