Key to the species of Alpheus brevirostris species group from the eastern Pacific

1. Basicerite without lateral tooth. Palm dorsal margin of major chela with subdistal transverse groove or notch............. 2

- Basicerite with acute lateral tooth. Palm dorsal margin of major chela, entire, without subdistal transverse groove or notch.. 3

2. Minor cheliped with ventral margin concave at dactylar articulation level; merus of third pereopod 3 times as long as broad............................................................................... A. aequus Kim & Abele, 1988

- Minor cheliped with ventral margin almost straight, without concavity; merus of third pereopod 5 times as long as broad......................................................................... A. naos Anker, Hurt & Knowlton, 2007

3. Major chela with lateral and mesial margins flanking the socket of pollex elevated, crenulated dorsally, with long setae on each pit. Minor chela with acute tooth on each side of dactylar articulation. Diaeresis of uropodal exopod sinusoidal. Dactylus of third pereopod conical.............................................................. A. luiszapatai sp. nov.

- Major chela with lateral and mesial margins flanking the socket of pollex low, smooth, without bunches of setae. Minor chela without acute tooth on each side of dactylar articulation. Diaeresis of uropodal exopod straight. Dactylus of third pereopod subspatulate..................................................... A. hephaestus Bracken-Grissom & Felder, 2014