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According to Willmott & Lamas (2006), Hyalenna is diagnosed by the following two relatively easily-observed synapomorphies in the male hindwing venation:
- Male HW vein Sc,R1 terminating before wing margin
- Male HW androconial scale patch in cell Rs-Sc,R1 short, not extending basally beyond origin of vein Cu2 or distally beyond origin of vein M2.
They also note four synapomorphies from the male genitalia.