Species: steini DePALMA, BURNHAM, MARTIN, LARSON, & BAKKER, 2015
Etymology: In honor of the paleontologist Walter W. Stein.
Holotype: BPMNH.P19.1113.T
Locality: Harding County, South Dakota.
Horizon: Upper Hell Creek
Formation.
Age: Lancian age, upper Maastrichtian Stage, uppermost
Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Right pedal ungual II, right pedal ungual III, right femur, left and right tibiae, left astragalus and calcaneum, left metatarsals II-IV, right metatarsal IV, 1 fragmentary dorsal centrum, 10 caudal vertebrae, furcula, left and right humeri, left and right radii, left and right ulnae, right metacarpals I and III, and three fragmentary left manual phalanges.
Referred material:
KUVP 152429 (gracile morphotype): Furcula.
KUVP 15605: Isolated tooth.
NCSM 13170: Isoalted furcula.
PBMNH.P.10.115.T (gracile morphotype): Right tibia.
PBMNH.P.10.118.T (gracile morphotype): Left astragalus and calcaneum.
PBMNH.P.10.119.T, PBMNH.P.10.121.T, PBMNH.P.10.122.T, PBMNH.P.10.124.T: Isolated teeth.
Note: ARBOUR, ZANNO, LARSON, EVANS, & SUES, 2016 refer the furcula to the entoplastron of the trionychid turtle cf. Axestemys splendida.
STEIN, 2021
Locality: Tooth Draw Deposit, Butte County, South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
TD-14-140: Tooth.
Number: Not given: Teeth.