Examples of ‘button-shaped’ sensilla on the lips of hypopharynx of Lithobiidae. ALithobius (Lithobius) forficatus; proximal part of lips forming median crest with cluster of ‘button-shaped’ sensilla; flattened spines flanking median crest margin BEupolybothrus (Eupolybothrus) grossipes; left lip with cluster of ‘button-shaped’ sensilla CLithobius (Lithobius) validusDLithobius (Sigibius) burzenlandicusELithobius (Lithobius) muticusFLithobius (Lithobius) carinatus. bsc – ‘button-shaped’ sensilla, smc – spines flanking median crest, tu – tuft of bristles. A top is dorsal; B–F top is medial.