PBDB Taxon

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

Plastomenus thomasii

Reptilia - Testudines

Taxonomy

Trionyx thomasii was named by Cope (1872) [AMNH 6018 is the designated neotype by Joyce and Lyson 2010]. Its type specimen is AMNH 6018, a partial shell, and it is a 3D body fossil. Its type locality is Cottonwood Creek badlands (Bridger B), which is in a Bridgerian terrestrial horizon in Wyoming.

It was recombined as Plastomenus thomasi by Hay (1908); it was considered a nomen dubium by Joyce and Lyson (2010); it was recombined as Plastomenus thomasii by Cope (1873), Cope (1875), Hay (1902), Hay (1930), Vitek and Joyce (2015), Lyson et al. (2021).

Synonyms

Plastomenus visendus was named by Hay (1908). Its type specimen is AMNH 1895, a shell, and it is a 3D body fossil. Its type locality is Rattlesnake Hills, which is in a Bridgerian terrestrial horizon in Wyoming.

It was synonymized subjectively with Plastomenus thomasii by Vitek and Joyce (2015).
Plastomenus tantillus was named by Hay (1908). Its type specimen is AMNH 5980, a partial shell (nearly the complete carapace and the greater portion of the plastron), and it is a 3D body fossil. Its type locality is Near the mouth of Cottonwood Creek (Bridger B), which is in a Bridgerian terrestrial horizon in Wyoming.

It was synonymized subjectively with Plastomenus thomasii by Vitek and Joyce (2015).

Synonymy list

Year	Name and author
1872	Trionyx thomasii Cope p. 462
1873	Plastomenus thomasii Cope
1875	Plastomenus thomasii Cope p. 35
1902	Plastomenus thomasii Hay p. 452
1908	Plastomenus thomasi Hay p. 474 figs. Text-figs. 633-637
1908	Plastomenus visendus Hay p. 476 figs. Plate 87, figs. 1, 2; text-figs, 636, 637
1908	Plastomenus tantillus Hay p. 478 figs. Figs. 638, 639
1930	Plastomenus tantillus Hay p. 107
1930	Plastomenus thomasii Hay p. 107
1930	Plastomenus visendus Hay p. 107
2015	Plastomenus thomasii Vitek and Joyce
2021	Plastomenus thomasii Lyson et al.

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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

Rank	Name	Author
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
—	Testudinata	(Oppel 1811)
order	Testudines	Batsch 1788
suborder	Cryptodira
suborder	Trionychia
—	Pantrionychidae	Joyce et al. 2004
—	Plastomenidae	()
—	Plastomenini
genus	Plastomenus	Cope 1873
species	thomasii	()

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.

†Plastomenus thomasii Cope 1872

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Invalid names: Plastomenus tantillus Hay 1908 [synonym], Plastomenus visendus Hay 1908 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Entire body:

yesg

Adult length:

100 to < 1000g

Environment:

freshwaterg

Locomotion:

actively mobilec

Life habit:

aquaticg

Diet:

carnivoreg

Reproduction:

oviparoussubo

Created:

2006-04-19 15:13:52

Modified:

2006-04-19 17:13:52

Source: g = genus, subo = suborder, c = class, subp = subphylum

References: Carroll 1988, Uetz 2005, Hendy et al. 2009, Holroyd et al. 2001

Age range: Bridgerian or 50.30000 to 46.20000 Ma

Collections (4 total)

Time interval	Ma	Country or state	Original ID and collection number
Bridgerian	50.3 - 46.2	USA (Wyoming)	Plastomenus tantillus (131895) Plastomenus thomasi (16228) Plastomenus visendus (131894) Trionyx thomasii (type locality: 130809)