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Byeoljubuchelys yeosuensis

Osteichthyes - Testudines - Carettochelyidae

Discussion

The species name yeosuensis is derived from Yeosu City, where the fossil was found.

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Taxonomy
Byeoljubuchelys yeosuensis was named by Kim et al. (2025). Its type specimen is KDRC-YS-SR-001, a partial skeleton (a partial skeleton consisting of a nearly complete shell, two cervical vertebrae, fragmented thoracic vertebrae, one sacral vertebra, both scapulae and coracoid), and it is a 3D body fossil. Its type locality is Soneuk Island, which is in an Aptian/Albian alluvial fan mudstone in the Hasandong Formation of South Korea. It is the type species of Byeoljubuchelys.

Synonymy list
YearName and author
2025Byeoljubuchelys yeosuensis Kim et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
RankNameAuthor
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
Trionychia
familyCarettochelyidaeGill 1889
genusByeoljubuchelys
speciesyeosuensis

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.

Byeoljubuchelys yeosuensis Kim et al. 2025
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Diagnosis
ReferenceDiagnosis
M. Kim et al. 2025It differs from other carettochelyids by the unique combination of the following characters: neurals and pygal lacking midline keel, neural series broad and continuous, a reversal of neural orientation at neural II, vermiculated peripheral ornamentation, absence of distinct carapacial scute sulci, a lack of paired nuchal processes, a relatively broad cruciform plastron, long cervical vertebrae, and a humerus with sigmoidal shaft and lateral and medial processes at the level of the humeral head.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: freshwaterf
Locomotion: actively mobilec
Life habit: aquaticf
Diet: herbivoref
Diet 2: omnivoref
Reproduction: oviparousf
Created: 2005-08-26 14:25:47
Modified: 2005-08-26 16:25:47
Source: f = family, c = class, subp = subphylum
References: Kiessling 2004, Hendy et al. 2009, Carroll 1988, Uetz 2005

Age range: base of the Late/Upper Aptian to the top of the Early/Lower Albian or 119.57000 to 110.10000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Late/Upper Aptian - Early/Lower Albian119.57 - 110.1South Korea (Yeosu) Byeoljubuchelys yeosuensis (type locality: 276131)