Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections

Yaguarasaurinae

Reptilia - Squamata - Mosasauridae

Synonymy list
YearName and author
2013Yaguarasaurinae Palci et al.

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
orderSquamata
Episquamata
ToxicoferaVidal and Hedges 2005
superfamilyMosasauria
familyMosasauridae
subfamilyYaguarasaurinae
subfamilyYaguarasaurinae

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
A. Palci et al. 2013Small- to medium-sized mosasauroid lizards characterized by the following unique combination of anatomical features: frontals not invaded by posterior end of nares (i.e., lack of distinct narial emargination on frontals); jugal rami form a 90° angle and produce a distinct posteroventral process at their junction; quadrate ala forms a shallow concavity; medial parapet of dentary (dentary medial shelf) low, tooth roots largely exposed in medial view; dentary has a projection anterior to the first tooth (reversed in Russellosaurus).
Features that are shared by Romeosaurus and Russellosaururs to the exclusion of Yaguarasaurus include quadrate bone subcircular in lateral view and bearing distinct groove along the dorsal margin of the tympanic ala; distal portion of ectopterygoid process of pterygoid distinctly angled anterolaterally and bearing longitudinal grooves and ridges for articulation with ectopterygoid (this feature cannot be observed in Yaguarasaurus due to poor preservation; however, it may be present in this taxon as well, as suggested by our most parsimonious phylogenetic reconstruction); ‘V’-shaped suture line between surangular and articular; retroarticular process lies in a subvertical plane (i.e., lacks medial inflection); and anteromedial, posteromedial, and posterodorsal processes of coronoid very weakly developed.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: aquaticf
Diet: carnivoref
Vision: well-developedf
Reproduction: ovoviviparousf
Created: 2018-01-05 16:32:54
Modified: 2018-01-05 16:32:54
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Gervais 1852, Carroll 1988, Hendy et al. 2009

Age range: base of the Early/Lower Turonian to the top of the Early/Lower Coniacian or 93.50000 to 85.80000 Ma

Collections (9 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Turonian - Middle Turonian93.5 - 89.3Italy (Verona) Romeosaurus sorbinii (148885)
Late/Upper Turonian93.5 - 89.3Colombia (Huila) Yaguarasaurus columbianus (122676 122680 122682 122683)
Middle Turonian93.5 - 89.3USA (Texas) Russellosaurus coheni (93824)
Middle Turonian93.5 - 89.3Italy (Verona) Romeosaurus fumanensis (144507)
Early/Lower Coniacian89.3 - 85.8Colombia (Santander) Yaguarasaurus columbianus (142085)
Early/Lower Coniacian - Early/Lower Santonian89.3 - 83.5Italy (Verona) Romeosaurus fumanensis (144508)