Genus: Diclonius COPE, 1876 (nomen dubium)
Etymology: Greek, di-, “two,” and Greek, klon, “sprout, twig,” + us: “Double sprouting (teeth)”.

Species: pentagonus COPE, 1876 (nomen dubium)
Etymology: Greek, penta, "five" and Greek, gonia, "corner."
= Thespesius pentagonus (COPE, 1876) STEEL, 1969 (nomen dubium)
= Trachodon pentagonus (COPE, 1876) (nomen dubium)

Holotype: AMNH 3972

Locality: Dog Creek(?), four miles east of Judith River, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth.

Referred material:

One additional tooth and two teeth fragments.

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Species: perangulatus COPE, 1876 (nomen dubium)
Etymology: Latin, per-, "continous" and latin, angulus, "angle."
= Thespesius perangulatus (COPE, 1876) STEEL, 1969 (nomen dubium)
= Trachodon perangulatus (COPE, 187) (nomen dubium)

Holotype: AMNH 5737

Locality: Dog Creek(?), four miles east of Judith River, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth, and 12 additional fragmentary teeth.


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Species: calamarius COPE, 1876 (nomen dubium)
Etymology: Latin, calamarius, “pertaining to a pen."
= Thespesius calamarius (COPE, 1876) STEEL, 1969 (nomen dubium)
= Trachodon calamarius (COPE, 187) (nomen dubium)

Holotype: AMNH 5733

Locality: Dog Creek(?), four miles east of Judith River, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth, and four additional fragmentary teeth.