characteristics : اهم الصفات
Immatures : الطور الغير بالغ
*body robust.
*rectal gills located within abdomen.
Adults : الطور البالغ
*Antennae short and bristle-like .
*compound eyes large , often covering most of the head .
*Four membraneous wings with many veins & crossveins.
*Base of hind wing broader than forewing.
*One distinctively pigmented cell (stigma) on leading edge of
wing .
*Abdomen long & slender>
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