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31a. Female, caudal ramus outer margin constricted in distal half, typical form with outer apical seta strongly outbent at base.  Male, outer apical seta inbent.  Male, leg 4 exopod segment 3 with two terminal spines curved.

Attheyella nordenskioldii

31b. Caudal ramus outer margin usually not constricted in distal half, outer caudal seta not modified.  Male, leg 4 exopod segment 3 spines not modified.

Attheyella illinoisensis