Cell bcu (=cell cup, anal cell) is a small cell near the base of the wing. It is bordered by vein Cu anteriorly, by vein A1 posteriorly, and by vein Cu2 distally. In Anastrepha and Toxotrypana, vein Cu2 has a sharp bend, such that cell bcu has an elongate posterodistal lobe. Vein A1+Cu2 runs from the apex of the posterodistal lobe to the wing margin.