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Champsosaurus

Reptilia -

Synonyms
Synonymy list
YearName and author
1876Champsosaurus Cope pp. 348-350
1876Champsosaurus profundus Cope pp. 350-351
1876Champsosaurus annectens Cope pp. 351-352
1876Champsosaurus brevicollis Cope pp. 352-353
1876Champsosaurus vaccinsulensis Cope p. 353
1881Champsosaurus australis Cope
1882Champsosaurus saponensis Cope
1882Champsosaurus puercensis Cope p. 195
1882Champsosaurus saponensis Cope p. 196
1887Champsosaurus Baur p. 100
1902Champsosaurus annectens Lambe p. 45
1933Champsosaurus inflatus Parks p. 131
1933Champsosaurus inelegans Parks p. 135
1956Champsosaurus Russell p. 4
1964Champsosaurus Estes p. 99
1970Champsosaurus Estes and Berberian p. 4
1972Champsosaurus Erickson p. 8
1976Champsosaurus Estes p. 507
1981Champsosaurus Erickson
1988Champsosaurus Carroll
1990Champsosaurus Evans
1991Champsosaurus Evans
1993Champsosaurus Cvancara and Hoganson p. 15
1993Champsosaurus profundus Cvancara and Hoganson p. 15
1998Champsosaurus Gao and Fox p. 315
2001Champsosaurus Peng et al. p. 32
2005Champsosaurus Gao and Fox p. 439
2007Champsosaurus Matsumoto et al. p. 342
2010Champsosaurus Matsumoto and Evans
2013Champsosaurus Matsumoto et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Choristodera()
suborderNeochoristoderaEvans and Hecht 1993
genusChampsosaurus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
K. -Q. Gao and R. C. Fox 1998Champsosaurus can be diagnosed by a suite of derived character states as follows: great elongation of snouth, exceeding 1/2 of skull length; interorbital width narrower than diameter of orbit; lacrimal strongly reduced to small triangle; postorbital excluded from formation of orbit; premaxilla/vomer contact lost; internarial present; choanae in posterior portion, in correspondence with elongation of vomer; interpterygoid foramen small, enclosed both anteriorly and posteriorly by pterygoids and located near posterior border of suborbital fenestra; suborbital fenestra shortened and kidney-shaped pterygoid/parasphenoid articulation fused; craniomandibular joint anterior to level of occipital condyle; neomorph forming most of ventral border of posttemporal fenestra; paraoccipital process strongly deflected ventrally; basal tubera of basisphenoid expanded posteroventrally and wing-like; elongation of mandibular symphysis to over 1/2 of length of tooth row; splenial strongly intervening in mandibular symphysis.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: freshwaterg
Locomotion: actively mobilec
Life habit: aquaticg
Diet: piscivoreg
Created: 2005-09-14 13:39:08
Modified: 2005-09-14 15:39:08
Source: g = genus, c = class, subp = subphylum
References: Kiessling 2004, Bryant 1989, Carroll 1988, Hendy et al. 2009

Age range: base of the Turonian to the top of the Cf2 or 93.90000 to 55.80000 Ma

Collections (210 total)


Time interval Ma Country or state Original ID and collection number
Turonian93.9 - 89.8Canada (Nunavut) C. sp. (45559)
Campanian83.6 - 72.1Canada (Alberta) C. annectens (150749) C. sp. (34375 45819 45821 45894 62722)
Campanian83.6 - 72.1USA (Montana) C. sp. (22691 59373)
Early/Lower Campanian83.5 - 70.6Canada (Alberta) C. sp. (181024)
Judithian83.5 - 70.6USA (Wyoming) C. natator (14458)
Late/Upper Campanian83.5 - 70.6Canada (Alberta) C. annectens (133004) C. natator (22695 22696 22697 22698 34302 34303 34305 34307 34309 34310 34311 34312 34313 34315 34319 34320 34321 34322 45238 45260 45261 45262 45264 47784 47793 47807 47811 47812 47814 47816 189515) C. sp. (22659 36264 45671 45674 45822 45892 45893 45897 45898 98674 98677)
Late/Upper Campanian83.5 - 70.6USA (Montana) C. sp. (59217)
Middle Campanian83.5 - 70.6Canada (Alberta) C. lindoei (117922 118188 118190) C. natator (45240 47794 47795 47809 117923 117927 117928 117929 117930) C. sp. (45560 45561 45564 45565 45566 45567 45670 45820 118189)
Middle Campanian - Late/Upper Campanian83.5 - 70.6Canada (Saskatchewan) C. sp. (14494 75030)
Middle Campanian - Late/Upper Campanian83.5 - 70.6USA (Montana) C. sp. (14437 14490 50907)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Canada (Alberta) C. albertensis (117924) C. sp. (52072 52249)
Middle Campanian - Maastrichtian83.5 - 66.0Canada (Alberta) C. sp. (34373)
Maastrichtian72.1 - 66.0Canada (Saskatchewan) C. sp. (35251 45675)
Maastrichtian72.1 - 66.0USA (Montana) C. sp. (13142 183109 183110)
Maastrichtian72.1 - 66.0USA (South Dakota) C. sp. (45388 45389 45390 45391 48551 50082 150891 150892 150893 150894 150895)
Maastrichtian72.1 - 66.0USA (North Dakota) C. sp. (45099 45102 45109 45110 45111 45112 45114 45117 45118 45120 45122 45124 45130 45134 45135 45136 45144 45145 45299 45380 45381 45382 57919 137720 141583)
Early/Lower Maastrichtian70.6 - 66.0Canada (Alberta) C. sp. (52468 55363 135740)
Edmontonian70.6 - 66.0Canada (Alberta) C. sp. (14502)
Lancian70.6 - 66.0Canada (Alberta) C. sp. (14569)
Lancian70.6 - 66.0Canada (Saskatchewan) C. sp. (14555 14655)
Lancian70.6 - 66.0USA (Wyoming) C. sp. (14505 14514 14519 14524 14538 14540 14557 14566 75447)
Lancian70.6 - 66.0USA (Colorado) C. sp. (14640)
Lancian70.6 - 66.0USA (South Dakota) C. sp. (14537 192251)
Lancian70.6 - 66.0USA (Montana) C. natator (14512 14533 14552 14615) C. sp. (14508 14547 14548 14560 14580 14613 14653) C. sp., C. natator (14549 14582 14639 14654)
Lancian70.6 - 66.0USA (North Dakota) C. laramiensis (14620 14621) C. sp. (14610 137601 137704 137706 137707 137710 137711 137712 137713 137715 137716 137724 137728 137731)
Late/Upper Maastrichtian70.6 - 66.0USA (Montana) C. sp. (14674 88990)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) C. sp. (14585)
Late/Upper Maastrichtian70.6 - 66.0Canada (Saskatchewan) C. laramiensis (180638) C. sp. (54105)
Late/Upper Maastrichtian70.6 - 66.0USA (Texas) C. sp. (110177)
Puercan66.0 - 63.3USA (Wyoming) C. sp. (14729 14730 14796 14797 14805)
Puercan66.0 - 63.3USA (Montana) C. sp. (14766 123518)
Puercan66.0 - 63.3USA (Utah) C. sp. (14692 14790)
Torrejonian63.3 - 61.7USA (Montana) C. sp. (14874)
Torrejonian63.3 - 61.7USA (Wyoming) C. sp. (14912)
Ti361.7 - 56.8Canada (Alberta) C. sp. (14992)
Tiffanian61.7 - 56.8USA (North Dakota) C. sp. (14931 14962) C. sp., C. gigas (15000) C. tenuis (118170)
Tiffanian61.7 - 56.8Canada (Saskatchewan) C. gigas (14978)
Tiffanian61.7 - 56.8USA (Wyoming) C. sp. (15017)
Late/Upper Paleocene58.7 - 55.8France (Oise) C. sp. (166598)
Late/Upper Paleocene58.7 - 55.8USA (North Dakota) C. gigas (27640 78394)
Late/Upper Paleocene58.7 - 55.8France (Champagne-Ardenne) C. sp. (117931)
Cf256.8 - 55.8USA (Wyoming) C. sp. (46679)
Cf356.8 - 55.8USA (Wyoming) C. sp. (46676 46678)
Clarkforkian56.8 - 55.8USA (Wyoming) C. gigas (15181 15212)
Clarkforkian56.8 - 55.8USA (Montana) C. sp. (137834)