Species: nyktos RICH, VICKERS-RICH, CONSTANTINE, FLANNERY, KOOL & van KLAVEREN, 1997
Etymology:

Holotype: MSC 007 (= NMV P208090)

Locality: Flat Rocks fossil site on the marine shore platform in the Bunurong Marine Park near Iverloch, 38°39'40+-02"S, 145°40'52+-03"E, World Geodetic Standard 1984, Victoria State, Australia.

Horizon: Wonthaggi Formation, Strezelecki Group.

Biostratigraphy:

Age: Aptain Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Dentary with teeth.

Referred material:

MSC 145 (= NMV P208228): Right mandible fragment mondearately crushed with p4-m4, 4 tooth roots present anterior to p4.

RICH & VICKERS-RICH, 2004

NMV P208482: A heavily crushed right mandibular fragment.

= ?Ausktribosphenos nyktos NMV P210086: Right mandibular fragment with alveoli for p5-6 and m2, extremely damaged crown of m1 together with a mold of the labial side of that tooth and partial crown of m2 embedded in matrix.