Cybister yulensis is a diving beetle species in the family Dytiscidae that occurs in Australia and New Guinea.

This band is different from that of other Cybister species because it stops near the elytra's posterior apex instead of continuing all the way[3] and is slightly thicker and more distinct than that of C.

[1] Another way to identify C. yulensis is to look for the greenish pit in the pronotal process, on the thorax's sternum.

The shape of the males’ penis expands a little surrounding a slight constriction in the middle of it, and the parameres do not extend in length as much as the main aedeagal structure.

[1][2][3][4][5] The Australian states where it occurs include the Northern Territory and the north of Queensland and Western Australia.

The elytra are not completely smooth either, having a series of large, elongate, shallow, and moderately distinct punctures along with very fine reticulation.

[1] Reduced punctures and very weak reticulation, also with minute meshes, appear on the metacoxal plate of the hind legs.

[2] The ventral surface is black,[1] apart from the dark reddish abdomen[2] and narrow pronotal process in the center.

[3] In addition, the mesepimerons, metasternal wings minus the posterior half, and metacoxa all have a ferruginous-testaceous color.

[1][6] The legs are black with weak testaceous variation,[6] except for the ferruginous-tinged profemurs, mesofemurs, and hind knees.

[3] Male Cybister yulensis beetles have round suckers, or adhesive pads, on their protarsi designed to help them adhere to the female's body during mating.

[1] This middle portion of the tarsus has moderately developed fringing setae as do the protarsi.

[6] The tube of the penis, the part which is externally visible, has a truncated apex with straight lateral angles.

[1] In females, the pronotum and elytral base have a cleft or series of deep scratches, also known as sexual sculpturing.