PBDB Taxon

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

Hyphalosaurus

Reptilia

Taxonomy

Hyphalosaurus was named by Gao et al. (1999). Its type is Hyphalosaurus lingyuanensis. It was considered monophyletic by Gao and Ksepka (2008).

It was assigned to Diapsida by Gao et al. (1999); to Hyphalosauridae by Gao and Fox (2005), Gao and Li (2007), Gao and Ksepka (2008), Hou et al. (2010), Matsumoto and Evans (2010), Zhou and Wang (2010); to Choristodera by Matsumoto et al. (2013), Matsumoto et al. (2019); and to Allochoristodera by Dong et al. (2020).

Species

H. baitaigouensis, H. lingyuanensis (syn. Sinohydrosaurus lingyuanensis) (type species)

Synonyms

Sinohydrosaurus was named by Li et al. (1999).

It was synonymized objectively with Hyphalosaurus by Smith and Harris (2001).

Synonymy list

Year	Name and author
1999	Hyphalosaurus Gao et al.
1999	Sinohydrosaurus Li et al.
2005	Hyphalosaurus Gao and Fox p. 438
2007	Hyphalosaurus Gao and Li p. 270
2008	Hyphalosaurus Gao and Ksepka p. 749
2010	Hyphalosaurus Hou et al.
2010	Hyphalosaurus Matsumoto and Evans
2010	Hyphalosaurus Zhou and Wang
2013	Hyphalosaurus Matsumoto et al.
2019	Hyphalosaurus Matsumoto et al.
2020	Hyphalosaurus Dong et al. p. 1239

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Eugnathostomata
—	Teleostomi	(Bonaparte 1836)
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha

Rank	Name	Author
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Eosuchia	()
—	Neodiapsida
—	Sauria	Gauthier 1984
—	Choristodera	()
genus	Hyphalosaurus

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. †Hyphalosaurus Gao et al. 1999

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†Hyphalosaurus baitaigouensis Ji et al. 2004

†Hyphalosaurus lingyuanensis Gao et al. 1999

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Invalid names: Sinohydrosaurus lingyuanensis Li et al. 1999 [objective synonym]

Invalid names: Sinohydrosaurus Li et al. 1999 [objective synonym]

Diagnosis

Reference	Diagnosis
K. -Q. Gao and D. T. Ksepka 2008	The genus is diagnosed by derived character states including an elongated neck consisting of 19–24 cervical vertebrae and subequal length of the third and fourth metatarsals. Because the skull of Shokawa remains almost entirely unknown, it is uncertain which features of the skull diagnose Hyphalosaurus and which are shared between the two taxa

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilep

Created:

2017-04-17 15:16:03

Modified:

2017-04-17 15:16:03

Source: subc = subclass, subp = subphylum, p = phylum

References: Kiessling 2004, Carroll 1988

Age range: base of the Aptian to the top of the Early/Lower Aptian or 121.40000 to 119.57000 Ma

Collections (4 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Barremian - Early/Lower Aptian	125.77 - 119.57	China (Liaoning)	H. baitaigouensis, H. sp. (67611) H. lingyuanensis (92906 117526)
Aptian	121.4 - 113.2	China (Liaoning)	H. sp. (105248)