I have on a former occasion explained to you how, in insects that have a petiolate abdomen, that part is elevated and depressed.
Leaves or leaflets are sessile when they have no stems, and petiolate when they have stems.
No such thing as a petiolate leaf occurs in acrogens, all are attached by a broad base?
Cotyledons accumbent, flattened, equal or nearly so, petiolate.
petiolate pet·i·o·late (pět'ē-ə-lāt', pět'ē-ō'lĭt) or pet·i·o·lat·ed (pět'ē-ə-lā'tĭd) or pet·i·oled (pět'ē-ōld')
Having a petiole.