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Geosaurus

Reptilia - Metriorhynchidae

Synonyms
Synonymy list
YearName and author
1824Geosaurus Cuvier
1826Halilimnosaurus Ritgen p. 331
1828Halilimnosaurus Ritgen p. 274
1845Geosaurus Meyer p. 282
1849Geosaurus d'Orbigny p. 209
1853Geosaurus Gervais p. 472
1966Ltliminosaurus Romer
1988Geosaurus Carroll
2001Geosaurus Gasparini and Iturralde-Vinent
2002Geosaurus Sepkoski, Jr.
2006Geosaurus Gasparini et al. p. 72
2007Geosaurus Larsson and Sues
2009Geosaurus Jouve
2009Geosaurus Young and Andrade p. 559
2010Geosaurus Young et al. p. 856
2011Geosaurus Cau and Fanti p. 558 fig. 6
2011Geosaurus Nascimento and Zaher
2012Geosaurus Bronzati et al.
2013Geosaurus Young fig. 6
2013Geosaurus Young et al.
2013Geosaurus Young et al.
2014Geosaurus Sertich and O'Connor
2015Geosaurus Parrilla-Bel and Canudo

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
RankNameAuthor
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
Pseudosuchia(Zittel 1890)
SuchiaKrebs 1974
Paracrocodylomorpha
Loricata(Merrem 1820)
Crocodylomorpha()
suborderCrocodyliformes
MesoeucrocodyliaWhetstone and Whybrow 1983
NeosuchiaClark 1988
suborderThalattosuchia
familyMetriorhynchidaeFitzinger 1843
subfamilyGeosaurinaeLydekker 1889
genusGeosaurusCuvier 1824

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
M. T. Young and M. B. Andrade 2009Metriorhynchid thalattosuchian possessing brevirostrine to short mesorostrine snout; strongly lateromedially compressed teeth, with the dental carinae formed by a raised ridge (keel), finely serrated (composed of true denticles); maxillary crowns moderately enlarged; cranial bones smooth, lacking conspicuous ornamentation; prefrontal teardrop-shaped, with the inflexion point directed posteriorly approximately 70° from the anteroposterior axis of the skull; acute angle formed by the lateral and medial processes of the frontal; antorbitol cavity present and much longer than higher; lacrimal–prefrontal fossa present, with a crest along the sutural contact
M. T. Young et al. 2010Metriorhynchid thalattosuchian with strongly lateromedially compressed teeth, and with a keeled denticulate carinae; the premaxillary, maxillary, and dentary teeth are tri-faceted upon their labial surface; there is a notch at the premaxilla–maxilla contact that an enlarged dentary tooth fits into; upper and lower jaw dentition arranged as opposing blades; cranial bones smooth, lacking conspicuous ornamentation; acute angle formed by the lateral and medial processes of the frontal; surangular poorly developed, terminating caudal to the anterior margin of the orbit; mandibular symphysis terminating prior to the antorbital fossa; robust and well-developed sclerotic ring encompassing the entire orbit.
Measurements
No measurements are available
Composition: hydroxyapatitesubo
Environment: marinesubo
Locomotion: actively mobilesubo
Life habit: nektonicsubo
Diet: carnivoresubo
Created: 2009-07-23 01:12:29
Modified: 2009-07-23 03:12:29
Source: subo = suborder
Reference: Kiessling 2004

Age range: base of the Middle Oxfordian to the top of the Early/Lower Hauterivian or 161.20000 to 130.00000 Ma

Collections (15 total)


Time interval Ma Country or state Original ID and collection number
Middle Oxfordian - Late/Upper Oxfordian161.2 - 155.7Cuba (Vinales) G. sp. (138289 138290)
Late/Upper Kimmeridgian155.7 - 150.8Germany (Baden-Württemberg) G. sp. (41817 89120)
Late/Upper Kimmeridgian155.7 - 150.8United Kingdom (England) G. sp. (26795)
Tithonian152.1 - 145.0Germany (Franconia) G. giganteus (24521)
Early/Lower Tithonian150.8 - 145.0Argentina (Neuquén) G. araucaniensis (79651) G. sp. (79652)
Early/Lower Tithonian150.8 - 145.0Germany (Bayern) Lacerta gigantea, G. giganteus, G. grandis (132062)
Early/Lower Tithonian150.8 - 145.0Germany (Bavaria) G. giganteus (29012)
Late/Upper Tithonian150.8 - 145.0Argentina (Neuquén) G. sp. (140285)
Berriasian145.0 - 139.8Argentina (Neuquén) G. araucaniensis (122662)
Early/Lower Valanginian140.2 - 136.4France G. lapparenti (155313)
Late/Upper Valanginian140.2 - 136.4France Dacosaurus lapparenti (123368)
Early/Lower Hauterivian136.4 - 130.0France G. lapparenti (155311)