All (in this database) Crustacea list (Scientific names): Part O
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- obtusirostris Sars, 1861 (Bosmina), see Bosmina longispina
- oceanica (Ligia)
- oceanicus Segerstråle, 1947 (Gammarus)
- odessanus Schmankewitch, 1875, see Diacyclops bicuspidatus
- oithonoides (Sars, 1863) (Thermocyclops)
- Oniscidae Billberg, 1820 (Isopoda)
- Oniscus Linnaeus, 1758 (Oniscidae)
- Onychocamptus Daday, 1904 (Laophontidae)
- opacum Koch, 1835 (Armadillidium)
- Ophryoxys Sars, 1861 (Macrothricidae)
- ophthalmica (Jurine, 1820) (Cypria)
- ornata Noodt & Purajoki, 1953 (Schizopera)
- ovalis Kurz, 1875 (Chydorus)
- ovum (Jurine, 1820) (Cyclocypris)
- Oxyurella Dybowski & Grochowski, 1894 (Chydoridae)
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Markku Savela
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