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Family Alpheidae 197
4. (3) Ventrolateral tooth on basal segment of antennal peduncle not overreaching
stylocerite; scaphocerite lacking prominent tooth or lobe near proximal end of ouier
margin; merus of first pereopod with distal tooth on mesial inferior margin; palm of
major first chela with both superior and inferior margins entire, not notched;
movable finger of minor first chela laterally and mesially carinate, densely setose,
"balaeniceps"-shaped in both males and females; third and fourth pereopods with
dactyli simple, ischia with movable spines on lateral surfaces; distolateral spine on
exopod of uropod dark-colored in both male and female.. A. formosus
Ventrolateral tooth on basal segment of antennal peduncle distinctly overreaching
stylocerite; scaphocerite with prominent curved tooth or lobate projection near
proximal end of outer margin; merus of first pereopod without distal tooth on
inferior margin; palm of major first chela notched superiorly; minor first chela not
"balaeniceps"-shaped in either male or female; third and fourth pereopods with
dactyli biunguiculate, ischia unarmed; distolateral spine on exopod of uropod darkcolored
in male only A. malleator
5. (2) Ocular hoods spined (adrostral furrows not abruptly delimited posteriorly;
scaphocerite without large tooth or lobe near proximal end of lateral margin)....... 6
Ocular hoods not spined (third and fourth pereopods with simple dactyli) 10
6. (5) Merus of first pereopod with sharp distal tooth on mesial inferior margin; third and
fourth pereopods with dactyli not distinctly biunguiculate (meri of third and fourth
pereopods without distal teeth on inferior margins) 7
Merus of first pereopod without distinct sharp tooth at distal end of inferior margin;
third and fourth pereopods with dactyli distinctly biunguiculate 9
7. (6) Third and fourth pereopods with inconspicuous denticles on inferior margins of
dactyli, ischia without movable spines on lateral surfaces A. websteri
Third and fourth pereopods without accessory denticle on inferior margins of
dactyli, ischia with movable spines on lateral surfaces 8
8. (7) Major first chela twisted and bearing single distinct sharp teeth on distal ends of
both lateral and mesial surfaces of palm A. amblyonyx
Major first chela not twisted and not bearing sharp teeth on distal ends of both
lateral and mesial surfaces of palm A. thomasi
9. (6) Third and fourth pereopods without distal teeth on inferior margins of meri
A. candei
Third and fourth pereopods with distal teeth on inferior margins of meri
A. peasei