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Three species of the crangonid shrimp genus Metacrangon Zarenkov, 1965 (Decapoda: Caridea), are reported from the south of Java, Indonesia, on the basis of material collected by the South Java Deep-Sea Biodiversity Expedition 2018 (SJADES 2018): M. clevai Komai, 2012, M. punctata Komai, 2012, and a new species, M. latirostris. No species of the genus has been heretofore recorded from the surveyed area. Metacrangon latirostris, new species, is distinctive in the genus by having the rostrum much wider than long and the anterior middorsal spine on the carapace located at the postrostral position. Metacrangon clevai and M. punctata, both known from Southwest Pacific localities, are first records for the eastern Indian Ocean. [ABSTRACT FROM AUTHOR]

Additional specimens belonging to the rare crangonid genus PrionocrangonWood-Mason and Alcock, 1891 collected from recent deep-sea expeditions in the West Pacific enable a revision of this poorly known genus. The four previously described species are all valid. The type species P. ommatosteresWood-Mason and Alcock, 1891, originally known only from the Andaman Sea, is considered to be also distributed in the Philippines and Indonesia. However, the material previously assigned to “P. ommatosteres” by de Man (1920) and Chace (1984) from Indonesia and the Philippines actually represents a new species, P. demani sp. nov., close to P. pectinataFaxon, 1896. Prionocrangon pectinata and P. curvicaulisYaldwyn, 1960 are still only known by their types. The distribution of P. dofleiniBalss, 1913 is now extended from Japan to Taiwan. Two more new species are recognized. Prionocrangon formosa sp. nov. from Taiwan is closely related to P. curvicaulis while P. paucispina sp. nov. from Taiwan and New Caledonia is unique in having very few dorsal carapace spines. The genus Prionocrangon is newly diagnosed and a key to the species is provided. Nevertheless, a damaged specimen from the Sulu Sea could not be satisfactorily assigned to any of the above seven species, suggesting that this genus may have even higher diversity. [ABSTRACT FROM AUTHOR]