Agromyzid male terminalia: The ninth sternite of abdomen, modified to an element of the male terminalia.
It is situated mainly below and partly within the epandrium (Ag nigrella genitalia.pct, Chr syngenesiae hypandrium.pct) where it is connected with the dorsal part. The easily visible part below the epandrium is triangular or 'u'-shaped. It consists of the sclerotized hypandrial frame of different thickness and often some inner sclerotizations, where the gonites are attached to. About the not sclerotized parts of the hypandrium not much is known since the male genitalia are normally studied in macerated condition.

Alternative form for hypandrium : hypandrial frame.