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Axestemys vittata

Reptilia - Testudines - Trionychidae

Taxonomy
Trionyx vittatus was named by Pomel (1847). Its type specimen is MNHN specimen, a carapace, and it is a 3D body fossil. Its type locality is Muirancourt, which is in an Eocene terrestrial lignite in France.

It was recombined as Palaeotrionyx vittatus by Broin (1977); it was recombined as Eurycephalochelys vittatus by Augé et al. (1997); it was recombined as Axestemys vittata by Georgalis and Joyce (2017) and Perez-Garcia and Smith (2021).

Synonyms
Synonymy list
YearName and author
1847Trionyx vittatus Pomel p. 328
1847Trionyx vittatus Pommel p. 328
1889Trionyx vittatus Lydekker p. 21
1909Trionyx levalensis Dollo p. 107
1970Eurycephalochelys fowleri Moody and Walker p. 504 figs. Plate 102, Figs. 1-5
1977Palaeotrionyx vittatus Broin
1997Eurycephalochelys vittatus Augé et al.
2017Axestemys vittata Georgalis and Joyce
2021Axestemys vittata Perez-Garcia and Smith

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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
genusAxestemys
speciesvittata()

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.

†Axestemys vittata Pomel 1847
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Invalid names: Eurycephalochelys fowleri Moody and Walker 1970 [synonym], Trionyx levalensis Dollo 1909 [synonym]
Diagnosis
ReferenceDiagnosis
A. Perez-Garcia and T. Smith 2021Member of Axestemys defined by the following exclusive character within this genus: reduced development of the xiphiplastral callosities. It shows the following unique character combination: longer than wide carapace; nuchal callosity restricted to the medial part of the plate; absence of suprascapular fontanelles; costal sculpturing not reaching the carapace margins; long anterior and medial free ribs; broad development of the hyoplastral and hypoplastral callosities; poorly ornamented outer surfaces of the hyoplastral, hypoplastral and xiphiplastral callosities; slender hyoplastra, hypoplastra and xiphiplastra, the plastral bridge having about a quarter of the hyo-hypoplastral length, and developing a broad drop-shaped fontanelle ahead the long and narrow medial hypoplastral processes, a subquadrangular fontanelle between these processes and the also long and narrow medial xiphiplastral processes, and a broad inverted drop-shaped fontanelle behind them.
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: Carroll 1988, Ernst and Barbour 1989

Age range: base of the MP 8 + 9 to the top of the Aquitanian or 55.80000 to 20.44000 Ma

Collections (15 total)


Time interval Ma Country or state Original ID and collection number
Ypresian56.0 - 47.8Belgium (Brabant) Palaeotrionyx vittatus (144103)
Ypresian56.0 - 47.8France (Marne) Palaeotrionyx vittatus (35533 35535 35539 181639 181653)
Ypresian56.0 - 47.8France (Île-de-France) Palaeotrionyx vittatus (68437)
Ypresian56.0 - 47.8Belgium (Leval-Trahegnies) Palaeotrionyx vittatus, Trionyx levalensis (144102)
Ypresian56.0 - 47.8Belgium (Hainaut) Trionyx vittatus (87947)
Early/Lower Eocene55.8 - 48.6France (Marne) Palaeotrionyx vittatus (181633)
Early/Lower Eocene55.8 - 48.6France (Oise) Palaeotrionyx vittatus (type locality: 144104)
MP 1055.8 - 48.6France (Picardie) Eurycephalochelys vittatus (68440)
MP 1055.8 - 48.6United Kingdom (England) Eurycephalochelys fowleri (41829)
MP 8 + 955.8 - 48.6France (Picardie) Palaeotrionyx vittatus (84997)
Aquitanian23.03 - 20.44France (Allier) Palaeotrionyx vittatus (181640)