Species: zellaguymondeweyae PAUL, 2025
Etymology: In honor of the author's maternal grandmother Zella Guymon Dewey (1901-2002), born and rasied in Huntington, Utah, 30 km northeast of the USNM 155660 quarry, who called the Wasatch Plateau, "the hills of home." Shortly after the specimen was exavated her family moved from Salt Lake Valley to the wartime Washington D. C. suburbs a few kilometers from the fossil's new Smithsonian location where I visited with her on occasion. She is buried in Arlington National Cementary with her husband Willimam E. Dewey (1899-1962).
= Alamosaurus sanjuanensis GILMORE, 1946

Holotype: USNM 15560

Locality: Southwest toe of North Horn Mountain, Manti-La Sal National Forest, Emery County, Utah.

Horizon: Lower North Horn Formation.

Biostratigraphy:

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

Material: 30 articulated caudal vertebrae, beginning with the first, 25 chevrons, 2 ischia, right somewhat incomplete, left scapula and coracoid, right humerus, ulna, radius, and metacarpus articulated, 2 sternal plates and parts of 3 ribs. Although not collected a sacrum with 5 vertebrae.

Caudal vertebrae 2-4 after FOWLER & SULLIVAN, 2011.

CRANNO & D'EMIC, 2015: Osteoderms, fragments of osteoderms.

Referred material:

CURTICE, 2016

BYU 9087: Proximal left humeurs and femur.

GILMORE, 1946

Locality: Lizard locality (Polyglyphanodon), S1/2, sec 17, T19S, R6E, South Dragon Valley, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

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

Material:

Number: Not given: 2 caudal centra.

 

Locality: West side of South Dragon Valley, NE 1/4, sec. 12, T19S, R5E, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

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

Material:

Number: Not given: 2 very large thoracic ribs.

 

= Alamosaurus sanguanensis D'EMIC, WILSON & WILLIAMSON, 2011

Locality: Ferron Mountain, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

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

Material:

BYU 11392, 11393: Anterior caudal vertebrae.

 

= Alamosaurus sanguanensis TYKOSKI, & FIORILLO, 2016

Locality: North-eastern part of the Big Bend National Park , Brewster County, Texas.

Note: Exact geographical information are avaible at the Perot Museum of Nature and Science, in Dallas, Texas for qualified researchers.

Horizon: Lower Javelina Formation.

Biostratigraphy:

Age: Lancian Latest Maastrichtian Stage, Uppermost Senonian Subepoch, Uppermost Gulf Epoch, Latest Cretaceous.

Material:

BIBE 45958: Partial left scapula.