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154 Family Palaemonidae
Genus Leander E. Desmarest, 1849
Key to species
Lateral extension of anterior margin of basal antennular segment convex; stylocerite
short, barely reaching to middle of basal antennular segment; scaphocerite slender
in both sexes; rostrum shallow in both sexes; fingers of second pereopod armed....
L. paulensis
Lateral extension of anterior margin of basal antennular segment concave or
straight; stylocerite may reach to distal third of basal antennular segment;
scaphocerite slender in male, but broader and tapering less rapidly to apex in
female; rostrum shallow in mature male, but very deep in mature female; fingers of
second pereopod unarmed L. tenuicornis
Genus Macrobrachium Bate, 1888
Key to species
[Based on Williams, 1984]
1. Carpi of second pereopods with maximum length as great or greater than meri 2
Carpi of second pereopods distinctly shorter than meri 4
2. (1) Palms of chelae on second pair of pereopods greatly swollen; prehensile surfaces of
noticeably gaping fingers thickly set with long, stiff setae M. olfersii
Palms of chelae on second pair of pereopods cylindrical, not greatly swollen;
fingers not noticeably gaping but may be hairy .• 3
3. (2) Fingers of chelae on second pair of pereopods thickly pubescent throughout length;
rostrum with teeth extending to tip M. acanthurus
Fingers of chelae on second pair of pereopods with scattered hairs, except thicker
on fingers along cutting edges; rostrum with toothless daggerlike tip... M. ohione
4. (1) Adult male with chelae of second pereopods equal in shape M. carcinus
Adult male with chelae of second pereopods very unequal in shape and size; smaller
pereopods with fingers gaping, gap being filled by stiff hairs, implanted on cutting
edges M. crenulatum