Genus: Avisaurus BRETT-SURMAN & PAUL, 1985
Etymology: Latin, avis, "bird" and Greek, sauros, "lizard": Literally “bird-lizard” (a deliberate mixture of Latin and Greek to emphasize the archosaurian-avian nature of this genus).

Species: archibaldi BRETT-SURMAN & PAUL, 1985
Etymology: In honor of David Archibald, its discoverer.

Holotype: University of California (Berkeley) Museum of Paleontology, UCMP 117600

Location: University of California (Berkeley) Museum of Paleontology, UCMP Locality V73097, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material: Left Metatarsus.

Paratype:

YPM 17324: Isolated right metatarsus.

Referred material:

STIDHAM & HUTCHISON, 2001

Locality: Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

Number: Not given: A large distal tibiotarsus.

= cf. Avisaurus archibaldi LONGRICH, TOKARYK & FIELD, 2011

YPM 57235: Large coracoid.

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Species: gloriae VARRICCHIO & CHIAPPE, 1995
Etymology: In recognition of Gloria Siebrecht, who has contributed countless volunteer hours to the MOR both in the field and in the preparation of specimens and whose keen eye discovered this specimen.
= Avisaurus sp VARRICCHIO, 1995

Holotype: MOR-553E

Locality: MOR Locality TM-068, Birthday Site, Glacier County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

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

Material: Right tarsometatarsus.
Note: Half the size of type.