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200 Family Alpheidae
Genus A utotnate De Man, 1888
Key to species
[Adapted from Chace, 1972]
1. Median frontal projection broadly rounded or subtriangular; propodi of third and
fourth pereopods armed with series of stout movable spines on inferior margin
(first segment of carpus of second pereopod at least half as long as second segment;
dactyli of third and fourth pereopods slender, not subspatulate) A. gardineri
Median frontal projection reduced to acute tooth or lacking; propodi of third and
fourth pereopods setose, without stout spines 2
2. (1) Median frontal projection a small acute tooth; first segment of carpus of second
pereopod much less than half as long as second segment; dactyli of third and fourth
pereopods broad, subspatulate ..A. evermanni
Frontal margin transverse, without median projection; first segment of carpus of
second pereopod at least half as long as second segment; dactyli of third and fourth
pereopods slender, not subspatulate A. rectifrons