Genus: Dryosaurus non MARSH, 1894

= Allosaurus medius MARSH, 1888 (nomen dubium) (partim)
= Dryosaurus grandis LULL, 1911 (nomen dubium)
Etymology:

Holotype: USNM 5453

Locality: Near Muirkirk, Prince George's County, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: First phalanx of digit IV of the hind foot.

Referred material:

USNM 5652: Astragalus (A).

USNM 5684: Proximal phalanx of digit III (C).

USNM 5704: Distal extremity of metatarsal (D).

USNM 2609: Phalanx (C).

Unnumbered ungual (B).

= Ornithomimus affinis GILMORE, 1920 (nomen dubium)
Etymology:
= Coelosaurus affinis (GILMORE, 1920) MATTHEW & BROWN, 1922 (nomen dubium)
= Archaeornithomimus? affinis (GILMORE, 1920) RUSSELL, 1972 (nomen dubium)
= Ornithomimus (Archaeornithomimus) affinis (GILMORE, 1920) PAUL, 1988 (nomen dubium)

Cotype: USNM 5703

Locality: Near Muirkirk, Prince George's County, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Right second phalanx digit III.

Cotypes:

USNM 6108: Left proximal phalanx of digit II.

USNM 8456: Right phalanx digit IV.

USNM 5684: Right distal portion of metatarsal II.

USNM. 5704: Right distal portion of metatarsal III.

USNM 6107: Second left phalanx digit IV.

USNM 5652: Right ungual phalanx of hind foot, astragalus.

USNM 5701: Distal caudal vertebra.

Referred material:

USNM 8454: Dorsal centrum.

USNM 6115: Proximal phalanx.

 

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