Key to the genera and species of Philippine water fleas.
83 a. Second antenna with dorsal branch 3-segmented and
ventral branch 3- or 4-segmented...............................84
83 b. Second antenna with dorsal branch 2-segmented and
ventral branch 3-segmented. Both branches together with
more than 10 setae. 6 pairs of similar legs.
SIDIDA (family), Diaphanosoma..............................88
84 a. First antenna fused with head, forming a snout-like formation.
BOSMINIDAE (family)........................................85
84 b. First antenna not fused with head...............................8
85 a. First antenna not united at base, parallel to each other.
Bosmina....................................................96
85 b. First antenna united at base and diverging from each other.
Bosminopsis................................................97
86 a. Both branches of second antenna 3-segmented.
CHYDORIDAE (family), Ephemeroporus(Chydorus)...............98
86 b. One branch of second antenna 3-segmented,
the other 4-segmented..........................................87
87 a. First antenna long, moveable, situated on the ventral side of
the large head.
MOINIDAE (family)..........................................88
87 b. First antenna short, not moveable, head small.
DAPHNIIDAE (family), Ceriodaphnia..........................91
87 c. First antenna long, situated on anterior margin of head.
MACROTRICIDAE..............................................99
88 a. Ocellus eye absent, only compound eye present.
Moina.....................................................93
88 b. One ocellus eye and compound eye present.
Moinodaphnia...............................................95
To 89a
