Temporal range: late Kungurian - early Roadian, 279.5–270 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Synapsida
Clade:
†Caseasauria
Family:
†Caseidae
Genus:
†Angelosaurus Olson & Berrbower, 1953
Species
A. dolani (type)Olson & Berrbower, 1953
A. greeni Olson, 1962
A. romeri Olson and Barghuser, 1962
Angelosaurus is an extinct genus of herbivorous caseid synapsids that lived during the late Lower Permian (Kungurian) and early Middle Permian (Roadian) in what is now Texas and Oklahoma in the United States. Like other herbivorous caseids, it had a small head, large barrel-shaped body, long tail, and massive limbs. Angelosaurus differs from other caseids by the extreme massiveness of its bones, particularly those of the limbs, which show a strong development of ridges, processes, and rugosities for the attachment of muscles and tendons. Relative to its body size, the limbs of Angelosaurus were shorter and wider than those of other caseids. The ungual phalanges looked more like hooves than claws. The few known cranial elements show that the skull was short and more robust than that of the other representatives of the group. Angelosaurus is also distinguished by its bulbous teeth with shorter and wider crowns than those of other caseids. Their morphology and the high rate of wear they exhibit suggests a diet quite different from that of other large herbivorous caseids, and must have been based on particularly tough plants. A study published in 2022 suggests that the genus may be paraphyletic, with Angelosaurus possibly only represented by its type species A. dolani.
be paraphyletic, with Angelosaurus possibly only represented by its type species A. dolani. The name of the genus Angelosaurus refers to the San Angelo...
consider Cotylorhynchus to be a taxon close to the genera Ennatosaurus and Angelosaurus. In the first phylogenetic analysis of caseids published in 2008, the...
5 to 8 cuspules respectively. Angelosaurus, one of the most derived caseids, has teeth with 5 cuspules. In Angelosaurus the teeth have a bulbous morphology...
with Angelosaurus romeri and the three species of Cotylorhynchus. In the second cladogram, Alierasaurus is positioned above the genus Angelosaurus and...
Genus Species Location Material Notes Images Angelosaurus A. dolani A caseid Caseoides C. sanangeloensis A caseid Caseopsis C. agilis A caseid Cotylorhynchus...
Ennatosaurus is more closely related to the genus Angelosaurus . However, the close relationship between Angelosaurus dolani and Ennatosaurus tecton may be distorted...
derive clade containing Ennatosaurus tecton, Cotylorhynchus romeri and Angelosaurus dolani. Below the first phylogenetic analysis of Caseidae published by...
Global Information