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MUSORSTOM collections from New Caledonia, the Strait of Makassar (Indonesia), the Philippines and near Madagascar contained many new records and some new species of pseudionines from non-anomuran hosts, a new genus and species of argeiine, orbionine parasites of penaeoid shrimps, a single athelgine from 2 hosts and the only entophiline known.Species of Pseudioninae reported are Pseudione indica Chopra, 1930 (new to the Pacific), infesting Plesionika narval (Fabricius) (new host record) in the Strait of Makassar; Ionella maculata sp.nov.infesting Callianassa sp.at New Caledonia; and Gigantione elconaxii sp.nov., infesting Elconaxius sp.at New Caledonia.In the Argeiinae is Eragia profunda, gen.nov., sp.nov., a parasite of Prionocrangon sp.nov.at New Caledonia.Species of Orbioninae reported (all new geographical and host records, except as noted) are Orbione halipori Nierstrasz & Brender a Brandis, 1923, from the Philippines, infesting Haliporoides sibogae (de Man) (not a new host record); Orbione cf.kempi Chopra, 1923, from New Caledonia, infesting Sicyonia truncata (Kubo); Epipenaeon fissurae Kensley, 1974, from the Strait of Makassar, infesting Parapenaeus longipes Alcock (not a new host record); Parapenaeon japonica (Thielemann, 1910) from near the Strait of Makassar (Indonesia), infesting Metapenaeopsis sinica Liu & Zhong; near Panay Island, Philippines, infesting Metapenaeopsis velutinus (Dana); NW of Madagascar (not a new locality), infesting Metapenaeopsis hilarula (de Man).Parapenaeon brevicoxalis Bourdon, 1981, from Chesterfield Islands, infesting Hymenopenaeus halli Bruce, 1966; Parapenaeon expansa Bourdon, 1979, from the Strait of Makassar, infesting Metapenaeopsis sinica Liu & Zhong, from the Seychelles, infesting Metapenaeopsis faouzii Ramadan, from Madagascar (not a new record), infesting Metapenaeopsis mogiensis consobrina (Nobili), and from New Caledonia, infesting Metapenaeopsis gaillardi Crosnier; and Parapenaeon secunda Nierstrasz & Brender a Brandis, 1923, near Manila, Philippines, infesting Metapenaeopsis palmensis (Haswell), and the Strait of Makassar, infesting Metapenaeopsis sinica Liu & Zhong.In the Athelginae is Pseudostegias setoensis Shiino, 1933, from Chesterfield Islands, a new locality, where it infests a new host, 'Trizopagurus' sp.(to be described as gen.nov..sp.nov.).In the Entophilinae, Entophilus omnitectus Richardson, 1903, is reported from Chesterfield Islands, a new locality, as a parasite of Munida 'incerta' Henderson, a previously reported host.Nearly all species are illustrated and described or redescribed.