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Chelonoidis alburyorum

Osteichthyes - Testudines - Testudinidae

Discussion

The holotype is on permanent loan to the Florida Museum of Natural History from The National Museum of The Bahamas.

We name this new fossil tortoise in honor of Nancy and Michael Albury of Man of War Cay, The Bahamas, in recognition of their efforts to conserve Sawmill Sink and other unique natural features on and near Great Abaco Island. The Alburys are prominent members of the Abaco Friends of the Environment, and Michael Albury serves as President of the Friends group and a council member of the Bahamas National Trust. Nancy Albury was instrumental in bringing international attention to the Sawmill Sink fossils and serves as Coordinator of the Sawmill Sink Project representing the Bahamian government. She also was responsible for cleaning, preserving, curating, and storing the Sawmill Sink fossils and for most of the photographs used in the description.

Taxonomy
Chelonoidis alburyorum was named by Franz and Franz (2009). Its type specimen is UF 225400 (NMB.AB50.T1), a skeleton (complete shell, complete skull (minus the mandible), 4 cervical and 16 caudal vertebrae, complete pectoral and pelvic girdles, front and hind limbs, and 4 termi), and it is a 3D body fossil. Its type locality is Sawmill Sink peat, which is in a Holocene sinkhole peat in the Bahamas.

Subspecies
C. alburyorum (type subspecies), C. keegani, C. sementis

Synonymy list
YearName and author
2009Chelonoidis alburyorum Franz and Franz p. 5 figs. 2-15
2015Chelonoidis alburyorum Rhodin et al.
2018Chelonoidis alburyorum Albury et al.
2018Chelonoidis alburyorum Vlachos
2020Chelonoidis alburyorum Franz et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
RankNameAuthor
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderCryptodira
Pantestudinoidea
superfamilyTestudinoidea
familyTestudinidaeBatsch 1788
tribeGeochelonini
genusChelonoidis()
speciesalburyorum

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.

Chelonoidis alburyorum Franz and Franz 2009
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Chelonoidis alburyorum alburyorum Franz and Franz 2009
Chelonoidis alburyorum keegani Franz et al. 2020
Chelonoidis alburyorum sementis Franz et al. 2020
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Diagnosis
ReferenceDiagnosis
F. Franz and S. F. Franz 2009We consider the new Bahamian tortoise to be a member of the Neotropical genus Chelonoidis rather than Hesperotestudo or other North American genera for the following reasons. Chelonoidis and C. alburyorum lack a cervical scute, extensive limb and tail armor, and obvious growth annuli. They have a thin-walled shell, neural formula of 4-8-4-8-6 (but showing considerable variation), enlarged entoplastron, enlarged pectoral scute, and an interior entoplastral sculpture (bird face). Additionally, Bahamian and West Indian land tortoises occur with other fossil vertebrates that have biogeographic affinities with the Neotropics. Previous researchers also have allied these fossil tortoises with Neotropical tortoises.

A moderate-sized tortoise (up to 466 mm CL) with an elongate, high-domed, thin-walled shell. Epiplastral shelf absent, gular apices (projections) short and rounded, distinctive entoplastral sculpture, and enlarged pectoral scute. Skull brachycephalic with a strap-like vomer, vaulted palate, undeveloped pedestal for origin of septum, and weak septum-like ridge instead of prominent thin-walled septum as in other Chelonoidis. The jugals are either fused to the maxilla or absent.
E. Vlachos 2018Chelonoidis alburyorum can be diagnosed as a member of Chelonoidis based on the characters listed above. Chelonoidis alburyorum is differentiated from other Chelonoidis by the development of an elongate, high-domed, thin-walled shell, brachycephalic skull with a strap-like vomer, vaulted palate, undeveloped pedestal for origin of septum and weak septumlike ridge, and the absence of vertebral gibosities.