Genus: Gilmoreytrannus SANCARLO & PAUL, 2026
Etymology: In honor of Charles W. Gilmore for recognizin the existence of multple tyrannosaur taxa in the TT-zone, and Peter Larson for his extensive reseach on the hypothesis, and Greek, tyrannos, “king”, Pigmy tyrant.

Species: lethaeus (ZANNO & NAPOLI, 2025) SANCARLO & PAUL, 2026
= Nanotyrannus lancensis LARSON, 2013
= Nanotyrannus lethaeus ZANNO & NAPOLI, 2025
Etymology: Latin, lethaeus, adjectival form of Lethe, the mythological River Lethe of the Underworld in Greco-Roman mythology. The name referes both the Hell Creek Formation in which the speicmen was found and the depiction of the Lethe in Virgil's Aeneid, from which souls must drink to forget thier previous life and be reincarnated, in recognition of oru reinterpretation of this specimen as neither Nanotyrannus lancensis nor a juvenile Tyrannosaurus rex, contrary to all previous literature.
= Nanotyrannus lancensis HENDERSON, 2005

Holotype: BMRP (Burpee Museum Rockford Paleontology) 2002.4.1

Locality: Burpee Museum Locality number K-12, public land under jurisdiction of the Federal Bureau of Land Management, northwestern Carter County, Montana.

Horizon: Hell Creek Formation (unknown level).

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Fragmentary skull and fragmentary skeleton of a juvenile.

Note: Nicknamed "Jane."

Note: Has a brodie abscess (Paleopathology) on a phalanx (VITTORE & HENDERSON, 2005, 2013)

Note: Has evidance for face bitting (PETERSON, HENDERSON, VITTORE & SCHERER). Possible penetrating holes made by pes claws on the scapula and ilium (ROTHSCHILDS, 2013).

Note: Nicknamed Jane.

Referred material:

HRS 08:

HRS 15001: