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Trionyx beecheri

Reptilia - Testudines - Trionychidae

Taxonomy
Aspideretes beecheri was named by Hay (1904). Its type specimen is YPM VP 000295, a partial skeleton, and it is a 3D body fossil. Its type locality is Converse County (?now Niobrara County), Eubaena cephalica holotype locality, which is in a Maastrichtian terrestrial horizon in the Lance Formation of Wyoming.

It was recombined as Hummelichelys beecheri by Chkhikvadze (2000); it was recombined as Aspideretoides beecheri by Danilov and Vitek (2013) and Holroyd et al. (2014); it was recombined as Trionyx beecheri by Vitek and Joyce (2015).

Sister species lacking formal opinion data
T. pliopedemontanus

Synonymy list
YearName and author
1904Aspideretes beecheri Hay p. 274 figs. plate 16
1908Aspideretes beecheri Hay p. 492 figs. Plate 90, fig. 2; plate 92, figs. l, 2; plate 96, figs. I, 2; text-fig. 647
1930Aspideretes beecheri Hay p. 108
1964Aspideretes beecheri Estes p. 98
2000Hummelichelys beecheri Chkhikvadze
2013Aspideretoides beecheri Danilov and Vitek
2014Aspideretoides beecheri Holroyd et al.
2015Trionyx beecheri Vitek and Joyce

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
RankNameAuthor
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
—Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
familyTrionychidaeGray 1825
subfamilyTrionychinaeGray 1825
genusTrionyx
speciesbeecheri()

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.

†Trionyx beecheri Hay 1904
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Body part: carapacef
Adult length: 100 to < 1000f
Grouping: solitaryf
Environment: brackish, freshwaterf
Locomotion: actively mobilef
Life habit: aquaticf
Diet: piscivoref
Diet 2: carnivoref
Reproduction: oviparousf
Created: 2005-08-25 13:24:04
Modified: 2005-09-09 19:45:41
Source: f = family, subp = subphylum
References: Ernst and Barbour 1989, Carroll 1988

Age range: base of the Late/Upper Campanian to the top of the Late/Upper Maastrichtian or 83.50000 to 66.00000 Ma

Collections (9 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Campanian83.5 - 70.6USA (Montana) Aspideretes beecheri (26766)
Lancian70.6 - 66.0USA (Wyoming) Aspideretes beecheri (14519 14538 14579)
Late/Upper Maastrichtian70.6 - 66.0USA (Montana) Trionyx beecheri (189003)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) Aspideretes beecheri (14585 57159 type locality: 123098)
Late/Upper Maastrichtian70.6 - 66.0USA (North Dakota) Trionyx beecheri (141582)