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Males

1.  Ninth sternum produced well beyond the 10th segment, scoop-shaped and sometimes with an upturned terminal tongue; a basicercal process present on the first cercal segment; at least 2 cercal segments; no ventral, membranous coxal gill scars present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brachypterainae, Strophopteryx fasciata

    Ninth sternum produced little, if an, past the 10th segment, not scoop-shaped and never with an upturned tongue; a single cercal segment with no basicercal process; ventral, membranous coxal gill scars usually evident . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Taeniopteryginae; Taeniopteryx

Females

 1.  Ninth sternum produced well beyond bases of the subanal lobes; no ventral, membranous coxal gill scars present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brachypterainae, Strophopteryx fasciata

Ninth sternum not reaching the subanal lobes; ventral, membranous coxal gill scars usually evident . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Taeniopteryginae; Taeniopteryx

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