Fig. 2
From: Worker reproduction of the invasive yellow crazy ant Anoplolepis gracilipes
Scanning electron micrographs and histological sections of two types of workers in A. gracilipes. SEMs of abdomen of normal worker (a) and physogastric worker (b), and longitudinal sections through posterior abdomen part of normal worker (c) and physogastric worker (d). Note large accumulation of fat body and absence of spermatheca in physogastric worker. The location where spermatheca is supposed to be found if it exists is highlighted with circled area in figure (e). DGd: Dufour gland duct, FB: fat body, HG: hindgut, MT: Malpighian tubules, OV: ovaries, OVD: oviduct, VG: venom gland, VGd: venom gland duct