Averostra Avetheropoda Coelurosauria Dinosauria Dromaeosauridae Eusaurischia Late Cretaceous Maniraptora Maniraptoriformes Neotheropoda North America Orionides Paraves Pennaraptora Saurischia Tetanurae Theropoda Tyrannoraptora

Richardoestesia isosceles

Dinosaur: Richardoestesia isosceles

Cretaceous: 86.3–66 Ma

TRIASSIC

JURASSIC

CRETACEOUS

252

201

145

Type: Theropod

*Length:**	1.5 m	4.9 ft
*Weight:**	6 kg	13 lb

ESR: 0.5 / 4 (estimated size reliability)
*The largest known specimen

Area: North America

Period

Epoch: Late Cretaceous
Stage: Late Santonian-Maastrichtian
Years: 86.3–66 Ma

Details

Status: valid
Author: Sankey
Year: 2001

Distribution

Area: North America
Country: USA, Canada, Mexico
Region: Texas, New Mexico, Wyoming, Montana, North Dakota, South Dakota, Alberta, Saskatchewan, Chiapas
Formation: Aguja, Menefee, Mesaverde, Judith River, Hell Creek, Lance, Milk River, Foremost, Dinosaur Park, Frenchman, Horseshoe Canyon, Scollard, Ocozocoautla

Classification

Dinosauria
Saurischia
Eusaurischia
Theropoda
Neotheropoda
Averostra
Tetanurae
Orionides
Avetheropoda
Coelurosauria
Tyrannoraptora
Maniraptoriformes
Maniraptora
Pennaraptora
Paraves
Dromaeosauridae

Sources

Material: Many teeth.
References: Mortimer - Theropod database (online). Sankey, (2001). Late Campanian southern dinosaurs, Aguja Formation, Big Bend, Texas. Rubén Molina-Pérez & Asier Larramendi (2019) Dinosaur Facts and Figures: The Theropods and Other Dinosauriformes.