Ooperipatellus duwilensis

The dorsal surface of this species can be grayish blue or tan, and the ventral pigment can be present, pale, or absent. The antennae usually have the same color as the dorsal surface and feature no bands. Each antenna in this species features 30 complete rings, with alternating wider and narrower rings. The proximal rings expand on the ventral side to form sensory pads with two or three rows of bristles. The jaw features two blades, an inner blade with no diastema as well as an outer blade with no accessory teeth. This species features 14 pairs of legs with the last pair fully developed. The dorsal surface features 12 complete plicae (transverse ridges) between adjacent leg pairs. Each foot features thee spinous pads and three distal papillae (one anterior, one median, and one posterior), but no basal papillae. The male of this species features crural papillae on the ventral surface of the legs from leg pair 9 or 10 through leg pair 13. The crural glands of leg pair 13 are long and extend into the body cavity, but the crural glands anterior to leg pair 13 do not extend into the body cavity. The male gonopore is cruciform, with all four arms of the cross equal in length. The female features an ovipositor between the last pair of legs with a longitudinal slit as the gonopore. This species exhibits many of the traits that characterize the genus Ooperipatellus. …

The species O. duwilensis is found in rotten logs. This velvet worm has a narrow distribution: This species is known only from its type locality, Mount William in Grampians National Park in Victoria, Australia.