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The monophyly of Greya is based on:
- a long, narrow membranous zone on the inner surface of the valva in the male genitalia
- a prominent pollex on the ventral margin of the valva (one species has a pectinifer in this position; it may be retention of the ancestral state or a result of a reversal.). See figures below.
- reversed size dimorphism between the sexes, with males being larger than females.