PBDB Taxon

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

Stereognathus

Tritylodontidae

Taxonomy

Stereognathus was named by Charlesworth (1854). Its type is Stereognathus ooliticus. It was considered monophyletic by Waldman and Savage (1972).

It was assigned to Mammalia by Owen (1859); to Marsupialia by Owen (1871); to Allotheria by Marsh (1889); and to Tritylodontidae by Simpson (1928), Simpson (1929), Waldman and Savage (1972), Carroll (1988), Maisch et al. (2004), Panciroli et al. (2017).

Species

S. ooliticus (syn. S. hebridicus) (type species), Xenocretosuchus kolossovi, Xenocretosuchus sibiricus

Synonyms

Xenocretosuchus was named by Tatarinov and Matchenko (1999). Its type is Xenocretosuchus sibiricus.

It was synonymized subjectively with Stereognathus by Averianov et al. (2018).

It was assigned to Tritylodontidae by Tatarinov (2008); and to Cynodontia by Kolosov et al. (2009).

Synonymy list

Year	Name and author
1854	Stereognathus Charlesworth
1859	Stereognathus Owen p. 159
1871	Stereognathus Owen pp. 18, 115
1889	Stereognathus Marsh
1928	Stereognathus Simpson p. 22
1929	Stereognathus Simpson p. 11
1972	Stereognathus Waldman and Savage
1988	Stereognathus Carroll
1999	Xenocretosuchus Tatarinov and Matchenko
2004	Stereognathus Maisch et al.
2008	Xenocretosuchus Tatarinov
2009	Xenocretosuchus Kolosov et al.
2017	Stereognathus Panciroli et al. p. 4

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()

Rank	Name	Author
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
family	Tritylodontidae	Cope 1884
genus	Stereognathus	Charlesworth 1854

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. †Stereognathus Charlesworth 1854

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†Stereognathus ooliticus Charlesworth 1854

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Invalid names: Stereognathus hebridicus Waldman and Savage 1972 [synonym]

Invalid names: Xenocretosuchus Tatarinov and Matchenko 1999 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialuc

Locomotion:

actively mobilec

Created:

2017-04-17 15:15:35

Modified:

2017-04-17 15:15:35

Source: c = class, subp = subphylum, uc = unranked clade

References: Carroll 1988, Hendy et al. 2009

Age range: base of the Early/Lower Bathonian to the top of the Aptian or 168.20000 to 113.20000 Ma

Collections (15 total)

Time interval	Ma	Country or state	Original ID and collection number
Bathonian	168.2 - 165.3	United Kingdom (Scotland)	S. hebridicus (139746)
Bathonian	168.2 - 165.3	Russian Federation (Krasnoyarsk)	Tritylodontidae indet. (61891)
Early/Lower Bathonian	168.2 - 165.3	United Kingdom (England)	S. sp. (31054)
Late/Upper Bathonian	168.2 - 165.3	United Kingdom (England)	S. sp. (39075 57124 57125 57139 166423 224639)
Middle Bathonian	168.2 - 165.3	United Kingdom (England)	S. ooliticus (59357) S. sp. (92055)
Berriasian - Barremian	143.1 - 121.4	Russian Federation (Sakha)	Xenocretosuchus kolossovi (32313)
Barremian - Aptian	125.77 - 113.2	Russian Federation (Kemerovo)	Xenocretosuchus sp. (167304)
Barremian - Aptian	125.77 - 113.2	Russian Federation (Krasnoyarsk)	Xenocretosuchus sp. (53148)
Aptian	121.4 - 113.2	Russian Federation (Kemerovo)	Xenocretosuchus sibiricus (39680)