Genus: Cimolopteryx MARSH, 1892
Etymology: Greek, kimolia, “white earth, clay [Cretaceous]" and Greek, pteryx, “wing”: “Cretaceous wing”.
= Cimolopteryx MARSH, 1889 (nomen nudum)
= Timolopteryx GRANT, 1912 (sic)

Species: rara MARSH, 1892 emend HAY, 1902
Etymology: Latin, rarus, "rare."
= Cimolopetryx rarus MARSH, 1889

Holotype: YPM 1805

Locality: "Converse [= Niobrara] County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material: Left coracoid, lacking head and hyposternal process, and with damage to internal distal angel and middle of sternal facet.

Referred material:

BRODKORB, 1963

Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

UCMP 53962: Upper portion of right coracoid.

UCMP 53963: Upper portion of left coracoid.

UCMP 53964: Carpometacarpus.

 

= Cimolopteryx sp TOKARYK & JAMES, 1989

Locality: SMNH locality 72F08-0012 ("Gryde locality"), Frenchman Valley, south of Shaunavon, Saskatchewan.

Horizon: Frenchman Formation.

Biostratigraphy:

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

Material:

SMNH P1927.936: Humeral end of a left coracoid.

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Species: minima BRODKORB, 1963
Etymology: Latin, minima, “small.”

Holotype: UCMP 53976

Locality: UCMP V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.

Horizon: Upper Lance Formation.

Biostratigraphy:

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

Material: Upper 2/3 of right coracoid.
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Species: maxima BRODKORB, 1963
Etymology: Latin, maximus, "greatest."

Holotype: UCMP 53973

Locality: UCMP V-5711, Bushy Tailed Blowout, Quarry area includes the floor of a small blowout approximately 10 yards northwest of the highest point on the ridge forming the northeastern side of the blowouts of loc. V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.

Horizon: Upper Lance Formation.

Biostratigraphy:

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

Material: Upper portion of left coracoid.

Referred material:

Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.

Horizon: Upper Lance Formation.

Biostratigraphy:

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

Material:

UCMP 53957: Upper portion of left coracoid.

HOPE, 2002

Locality: Bug Creek West, west half of sec. 9, T22N, R43E, Western McCone County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

ANSP 15867: Right coracoid fragment including the distal end of the humeral facet, the scapular facet, and a short length of the shaft.

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Species: petra HOPE, 2002
Etymology: Latin, petra, "stone"; because of the tiny but robust, rocklike appearance of the specimen.

Holotype: AMNH 21911

Locality: UCMP V-5711, Bushy Tailed Blowout, Quarry area includes the floor of a small blowout approximately 10 yards northwest of the highest point on the ridge forming the northeastern side of the blowouts of loc. V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.

Horizon: Upper Lance Formation.

Biostratigraphy:

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

Material: Left coracoid, shoulder end.