Species: sylvestris COPE, 1872
Etymology: Latin, sylvestris, "forested, wooded."
= Agathaumas silvestre COPE, 1892 (sic)
= Agathaumas sylvestre COPE, 1890 (not 1889) (sic)
= Triceratops sylvestris (COPE, 1872) KUHN, 1936 (nomen dubium)
= Triceratops silvestris (COPE, 1872) (KUHN, 1936 (nomen dubium)
Holotype: AMNH 4000
Locality: 1/2 miles east of Black Buttes station on the Union Pacific Railroad, Black Buttes, 52 miles east of Green River, Sweetwater County, sec. 9, T18N, R100W, Wyoming.
Horizon: Lance Formation.
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Right ilium, 8 posterior dorsal and sacral centra, right ilium, and ribs, proximal portion of a pubis? and other fragments.
Figs. 1-16. A continnous series of dorsal, lumbar, and sacral vertebrae, viewed from the right side; one
only of the neural archs found in place
Fig. 2. Second vertebra of teh series: a, viewed from behind.
Fig. 7. Antepenultimate lumbar vertebra; c, viewed from before; d, viewed from behind.
Figs. 10-16. a the sacral series viewed from above.
10-16b. The same viewed from below.
Fig. 10, c, Proximal end of sacrum.
14, c. Distal end of the fifth vertebra of the same.
16. Seventh sacral vertebra; c, anterior view; d, posterior view, both exhibiting teh inferior position of the articular surface of the diapophysis.
17. A more disatal sacral vertebra; b, from below.
18. The neural arches of two consecutive ?sacral vertebrae, coosified, and with diapophyses free from the centrum; a, from above.
Figs. 19-20. undetermined bones.
Fig. 21. Lateral view of the acetabular portion of the ilium, with the base of the ischium continuous with it; a, the same, viewed from below.
Figs. 1-3. Agathaumas sylvestre, three views of the ilium. a, the outer side; b, the inferior edge, c, the inner side; the iliac acetabular face retaius some of the matrix.
Figs. 1-4. Agathaumas sylvestre.
Fig. 1. A rib.
Figs 2-3. Undetermined bones.
Fig 4. Neural arch of a dorsal vertebra minus the processes.
Age: Late Cretaceous.
Number: Not given: Ilium and tibia.