Apera sexangula H. Watson, 1915 superseded combination Chlamydephorus sexangulus, also known as the hexagonal hunterslug, is a species of predatory slug in the family Rhytididae.

[1] The animal is slender, with a body approximately hexagonal in cross-section due to four prominent longitudinal keels (dorsal grooves) — two on each side.

Seen dorsally, the body tapers to an acute posterior angle, but viewed laterally, the hind end appears more blunted due to the median keel (less rounded than in certain figures).

Dorsal grooves are prominent, spaced roughly 1 mm apart and separated by a single row of rugae, which becomes irregularly double towards the middle.

In life, however, the animal’s skin shows a deeper dull-red pigment, resulting in a chestnut or reddish-brown appearance, which is paler along the keels and foot.