;"O. anomalus";"O. bengalensis";"O. besnardi";"O. fratrisaustralis";"O. krusensterni";"O. mohammed";"O. taifensis";"O. vitiospinulosa";"O. satunensis sp. n.";"O. tratensis sp. n." "Ornamentation on cephalothorax";smooth;smooth;smooth;smooth;smooth;smooth;smooth;smooth;"internal sausage-like structure, and internal rounded structures";"1 middle and 2 lateral rounded integumental window-like structures" "Exp of antenna (setae)";"1, reduced";"4, well developed";"4, well developed";"4, well developed";"4, well developed";"4, well developed";"4, well developed";"4, well developed";"4, well developed";"4, well developed" "Lateral seta on exp of antenna";"complete absent";"pinnate spinulose seta";NA;"pinnate spinulose seta";"pinnate spinulose, seta";NA;"bare, slender, short seta";"bare, slender, short seta";"pinnate spinulose, seta";"pinnate spinulose seta" "Abexopodal seta of antenna";absent;present;present;present;present;present;absent;present;absent;absent "P2 enp-2 (inner setae)";2;2;2;2;2;2;1;2;2;2 "P4 exp-3 (outer spines)";2;3;2;2;2;3;3;3;2;2 "P4 exp-3 (inner seta)";present;present;absent;present;present;present;present;present;present;present "Female P5 exp and beseoendopod";separated;fused;separated*;separated;separated;separated;separated;separated;separated;separated "Setae on female P5 exp:enp";4:3;3:3;3:3;3:3;3:3;3:3;3:3;3:2;4:3;4:3 "Setae on male P5 exp";3;2;2;NA;2;2;2;2;3;3 "Male P5, outer seta of exp";A;C;NA;NA;C;C;B;B;D;E "CR (L:W ratio)";2.7;3.0–6.0;2;2.2–3.0;2.0–3.0;2.4–3;1.8–2.0;1.8–2.2;2.5;2.2 "Seta of male P6";a;d;NA;NA;c;c;e;b;a;a "Segment of male antennule";6;6–7;?;NA;6–7;7;7;7–8;8;8 Distribution;India;"India, Japan, Korea, Australia";"Brazil, Micronesia, NW Mexico";"NW Mexico";Alaska;Cosmo-politan;"China and Korea";Korea;Thailand;Thailand Ecology;Lake;Estuary;"With marine algae";Estuary;"Lagoon, 1 m";"Cave, FW";Lake;"Inland water";Cave;Peatswamp