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Toxolophosaurus

Reptilia - Sphenodontidae

Synonymy list
YearName and author
1960Toxolophosaurus Olson p. 551
1981Toxolophosaurus Throckmorton et al.
1985Toxolophosaurus Benton p. 157
1988Toxolophosaurus Carroll
2000Toxolophosaurus Reynoso
2003Toxolophosaurus Apesteguía and Novas
2012Toxolophosaurus Apesteguia et al.
2012Toxolophosaurus Rauhut et al.
2014Toxolophosaurus Cau et al.
2018Toxolophosaurus Herrera-Flores et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
RankNameAuthor
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
familySphenodontidaeCope 1871
Opisthodontia
subfamilyEilenodontinae
genusToxolophosaurus

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.

G. †Toxolophosaurus Olson 1960
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Toxolophosaurus cloudi Olson 1960
Diagnosis
ReferenceDiagnosis
G. S. Throckmorton et al. 1981A sphenodontid in which the cheek teeth are wider than long, being expanded transversely by a bulbous swelling on their lingual side so that the apex of each crown lies on the labial half of the tooth; in crown view, each tooth is crescentic, concave anteriorly, with lateral and medial wings overlapping the margins of the next tooth forward. Implantation is acrodont and evidence of tooth replacement is lacking. The amount of tooth wear increases anteriorly; two distinct wear facets are formed on the slightly worn posterior teeth, but these wear facets merge on themore heavily worn anterior teeth. The lingual wear facet lies on the dorsal surface of the tooth indicating contact with a row of palatine teeth on the upper jaw; it slopes ventromedially in posterior teeth but becomes increasingly horizontal anteriorly. The labial wear facet, formed by wear against the maxillary dentition, slopes steeply ventrolaterally in posterior teeth and becomes increasingly vertical anteriorly. Teeth number approximately twenty and increase in size posteriorly. The dentary is very deep and is exposed below the angular on the postero-internal face of the jaw. The symphyseal region is edentulous (at least in the adult), very wide and spoutlike, with a prominent symphyseal shelf behind the occlusal border. The coronoid process of the dentary lies posterolateral to, rather than directly behind, the tooth row.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Created: 2017-04-17 15:16:03
Modified: 2017-04-17 15:16:03
Source: subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Hendy et al. 2009

Age range: base of the Valanginian to the top of the Albian or 139.80000 to 100.50000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Valanginian139.8 - 132.9USA (Utah) T. sp. (27017)
Aptian - Albian125.0 - 100.5USA (Montana) T. cloudi (85072)