Key to adult males and females of Meximaera

1. Rami of uropod 3 very long, about 3 times length of peduncle; male gnathopod 2, basis broad.. M. mooreana (Myers, 1989)

- Rami of uropod 3 relatively short, about 1.5–2 times length of peduncle; male gnathopod 2, basis ordinary.............. 2

2. Gnathopod 2 palm without excavation; pereopod 5–7, bases each lacking posterodistal lobe... M. diffidentia Barnard, 1969a

- Gnathopod 2 palm with excavation in middle; pereopod 5–7, bases each with posterodistal lobe....................... 3

3. Coxa 1 anteroventral corner produced acutely; male gnathopod 2, excavation on palm shallow................................................................................................... M. briani Krapp-Schickel, 2008b

- Coxa 1 anteroventral corner rounded; male gnathopod 2, excavation on palm deep.......... M. tulearensis (Ledoyer, 1972)