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Yaguarasaurinae

Reptilia - Mosasauridae

Taxonomy
Yaguarasaurinae was named by Palci et al. (2013). It was considered monophyletic by Palci et al. (2013).

It was assigned to Mosasauridae by Palci et al. (2013) and Driscoll et al. (2019).

Synonymy list
YearName and author
2013Yaguarasaurinae Palci et al.
2019Yaguarasaurinae Driscoll et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
RankNameAuthor
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Squamata()
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.

Subfm. †Yaguarasaurinae Palci et al. 2013
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G. †Romeosaurus Palci et al. 2013
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Romeosaurus fumanensis Palci et al. 2013
Romeosaurus sorbinii Palci et al. 2013
G. †Russellosaurus Polcyn and Bell 2005
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Russellosaurus coheni Polcyn and Bell 2005
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: terrestrialuc
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, c = class, subp = subphylum, uc = unranked clade
References: Gervais 1852, Carroll 1988, Hendy et al. 2009

Age range: base of the Middle Turonian to the top of the Early/Lower Santonian or 93.50000 to 83.50000 Ma

Collections (5 total)


Time interval Ma Country or state Original ID and collection number
Turonian93.9 - 89.8Mexico (Puebla) Yaguarasaurinae indet. (215805)
Early/Lower Turonian - Middle Turonian93.5 - 89.3Italy (Verona) Romeosaurus sorbinii (148885)
Middle Turonian93.5 - 89.3USA (Texas) Russellosaurus coheni (93824)
Middle Turonian93.5 - 89.3Italy (Verona) Romeosaurus fumanensis (144507)
Early/Lower Coniacian - Early/Lower Santonian89.3 - 83.5Italy (Verona) Romeosaurus fumanensis (144508)