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110 a. Last segment of fifth leg of female with 3 appendages.
Caudal branches often with bristles.
EUCYCLOPINAE........................................111
110 b. Last segment of fifth leg of female with 1 or 2 appendages.
Sides of caudal branch without groups of bristles.
CYCLOPINAE..........................................114
111 a. Fifth leg form a very short and wide plate without
articulation with the fifth (posterior) thoracic segment.
First antenna with 9-10 segments. Caudal branches short
and thick with several transverse rows of small spines.
More or less littoral.
Ectocyclops........................................127
111 b. Fifth leg articulated with the fifth thoracic
segment, angular in outline. First antenna
with 6-12 segments.....................................112
111 c. Fifth leg two-segmented
Macrocyclops..........................................127c
112 a. Anterior part of body clearly flattened dorsoventrally.
First antenna very short with 8 segments (6-11 worldwide),
reaching only to the middle of the cephalothorax.
Caudal branch long and thin, 5-6 times as long as wide,
dorsally with transverse row of small spines. Littoral.
Paracyclops.........................................126
112 b. Anterior part of the body usually thick,
only slightly flattened.
First antenna with 12 segments.........................113
113 a. Outer margin of caudal branches with small distinct
saw-like spines. Caudal branches usually very divergent
and 4-5 times as long as wide. Lateral spine near the end
of the caudal branch. Littoral.
Eucyclops...........................................124
113 b. Outer margin of caudal branches without such spines,
and only diverging slightly, 2 1/2 times as long as wide.
Littoral.
Tropocyclops........................................125
To 114a
