PBDB Taxon

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

Hydrotherosaurus

Reptilia - Plesiosauria - Elasmosauridae

Taxonomy

Hydrotherosaurus was named by Welles (1943) [Sepkoski's age data: K u K Maes-u Sepkoski's reference number: 1069].

It was assigned to Alzadasaurinae by Welles (1962); to Plesiosauria by Sepkoski (2002); to Elasmosauridae by Welles (1943), Welles (1949), Carroll (1988), Carpenter (1999), Ketchum and Benson (2010), Hampe (2013), Benson and Druckenmiller (2014); and to Elasmosaurinae by O'Gorman (2019).

Species

H. alexandrae

Synonymy list

Year	Name and author
1943	Hydrotherosaurus Welles
1949	Hydrotherosaurus Welles
1962	Hydrotherosaurus Welles p. 4
1988	Hydrotherosaurus Carroll
1999	Hydrotherosaurus Carpenter p. 168 fig. 15
2002	Hydrotherosaurus Sepkoski
2010	Hydrotherosaurus Ketchum and Benson p. 15
2013	Hydrotherosaurus Hampe fig. 9
2014	Hydrotherosaurus Benson and Druckenmiller figs. 2-3
2019	Hydrotherosaurus O'Gorman

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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	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967

Rank	Name	Author
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
suborder	Sauropterygia
order	Plesiosauria	de Blainville 1835
superfamily	Plesiosauroidea	Welles 1943
family	Elasmosauridae	Cope 1869
—	Euelasmosaurida
—	Elasmosaurinae
genus	Hydrotherosaurus

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. †Hydrotherosaurus Welles 1943

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†Hydrotherosaurus alexandrae Welles 1943

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Environment:

marineo

Locomotion:

actively mobileo

Life habit:

aquatico

Depth habitat:

surfaceo

Diet:

carnivoreo

Reproduction:

viviparouso

Created:

2009-07-20 06:05:48

Modified:

2011-08-12 01:58:15

Source: o = order

Reference: Kiessling 2004

Age range: Maastrichtian or 72.10000 to 66.00000 Ma

Collections: one only

Time interval	Ma	Country or state	Original ID and collection number
Maastrichtian	72.1 - 66.0	USA (California)	H. alexandrae (108392)