Temporal range: Early Triassic-Late Cretaceous, 251–66 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Life restoration of Augustasaurus hagdorni
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Superorder:
†Sauropterygia
Clade:
†Eosauropterygia
Clade:
†Pistosauroidea Baur, 1887-90
Subgroups
†Chinchenia
†Corosauridae
†Cymatosauridae
†Kwangsisaurus
†Wangosaurus
†Pistosauria
†Pistosauridae
†Bobosaurus
†Yunguisaurus
†Augustasaurus
†Plesiosauria
Pistosauroidea is a group of marine reptiles within the superorder Sauropterygia that first appeared in the latter part of the Early Triassic and were the ancestors of plesiosaurs. Pistosauroids are rare in Triassic marine assemblages, and are represented by only a few fossils from central Europe, the United States, and China.[1] Recent phylogenetic analyses consider the Triassic pistosauroids to be a paraphyletic grouping, meaning that they do not form a true clade. Plesiosauria is now placed within Pistosauroidea, while the traditional pistosauroids are successively more basal, or primitive, sauropterygians.[2]
Below is a cladogram of pistosauroid relationships from Cheng et al. (2006):[1]
Sauropterygia
Placodontia
Pachypleurosauria
Nothosauria
Pistosauroidea
Corosaurus
Cymatosaurus
Pistosaurus
Yunguisaurus
Augustasaurus
Plesiosauria
Below is a cladogram of pistosauroid relationships from Ketchum & Benson, 2011:[3]
Pistosauroidea
Cymatosaurus
Pistosauria
"Pistosaurus postcranium"
Bobosaurus
Pistosaurus
Yunguisaurus
Augustasaurus
Plesiosauria
^ abCheng, Y.-N.; Sato, T.; Wu, X.-C.; Li, C. (2006). "First complete pistosauroid from the Triassic of China" (PDF). Journal of Vertebrate Paleontology. 26 (2): 501–503. doi:10.1671/0272-4634(2006)26[501:fcpftt]2.0.co;2. S2CID 85634946. Archived from the original (PDF) on 2011-09-28.
^Rieppel, O.; Sander, P.M.; Storrs, G.W. (2002). "The skull of the pistosaur Augustasaurus from the Middle Triassic of northwestern Nevada" (PDF). Journal of Vertebrate Paleontology. 22 (3): 577–592. doi:10.1671/0272-4634(2002)022[0577:tsotpa]2.0.co;2. S2CID 131693849. Archived from the original (PDF) on 2011-07-16.
^Hilary F. Ketchum; Roger B. J. Benson (2011). "A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids". Special Papers in Palaeontology. 86: 109–129.
Pistosauroidea is a group of marine reptiles within the superorder Sauropterygia that first appeared in the latter part of the Early Triassic and were...
basal to Eusauropterygia, e.i. the clade formed by Nothosauria and Pistosauroidea, instead as the sister taxon of Nothosauria. Many recent analyses have...
Pistosaurus and Plesiosauria belongs to clade Pistosauroidea from Triassic. Both Nothosauroidea and Pistosauroidea belong to Sauropterygia. Pistosaurus was...
(2000), Sauropterygia I, placodontia, pachypleurosauria, nothosauroidea, pistosauroidea: In: Handbuch der Palaoherpetologie, part 12A, 134pp. Verlag Dr. Friedrich...
2000. Sauropterygia I. Placodontia, Pachypleurosauria, Nothosauroidea, Pistosauroidea. Handbuch der Paläoherpetologie, Teil 12A. München, Friedrich Pfeil...
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