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198 Family Alpheidae
10. (5) Men of third and fourth pereopods with prominent acute teeth at distal ends of
inferior margins (lobe on frontal margin between rostrum and ocular hood; major
first chela subcylindrical, without superior or inferior notches; merus of first
pereopod with tooth at distal end of mesial inferior margin; immovable finger of
major first chela with notch in opposable margin distal to socket; proximal segment
of carpus of second pereopod shorter than second segment; third and fourth
pereopods with movable spines on lateral surfaces of ischia) A. cristulifrons
Men of third and fourth pereopods with distal ends of inferior margins rounded or
rectangular, not produced into prominent teeth 11
11. (10) Major first chela notched superiorly 12
Major first chela with superior and inferior margins entire, not notched (major first
cheliped with tooth at distal end of mesial inferior margin of merus; immovable
finger of major chela with notch in opposable margin distal to socket; minor first
chela of male not "balaeniceps"-shaped; third and fourth pereopods with movable
spines on lateral surfaces of ischia) 19
12. (11) Major first chela not notched inferiorly (ocular hoods subtriangularly produced
anteriorly; inferior margin of major first chela with shallow sinus at base of
immovable finger) A. normanni
Major first chela notched inferiorly 13
13. (12) Third and fourth pereopods with movable spines on lateral surfaces of ischia 14
Third and fourth pereopods without spines on ischia 17
14. (13) Merus of first pereopod unarmed at distal end of mesial inferior margin; dactyli of
third and fourth pereopods usually subspatulate 15
Merus of first pereopod armed with sharp tooth at distal end of mesial inferior
margin; dactyli of third and fourth pereopods not subspatulate 16
15. (14) Major chela with inferior margin of immovable finger distinctly truncate distally;
minor first chela of male not "balaeniceps"-shaped A. estuariensis
Major chela with inferior margin of immovable finger more evenly rounded distally,
not distinctly truncate; minor first chela of male "balaeniceps"-shaped
A. heterochaelis
16. (14) Adrostral furrows usually abruptly delimited posteriorly; immovable finger of
major first chela without V-shaped notch in opposable margin distal to socket
A. armillatus
Adrostral furrows not abruptly delimited posteriorly; immovable finger of major
first chela with sharply V-shaped notch in opposable margin distal to socket
A. viridari