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Chelonoidis lutzae
Taxonomy
Chelonoidis lutzae was named by Zacarias et al. (2013). Its type specimen is CTES-PZ 7391, a partial skeleton (partial carapace and almost complete plastron, including some appendicular elements), and it is a 3D body fossil. Its type locality is Arroyo Toropí (Toropí Formation), which is in a Lujanian terrestrial siliciclastic in the Toropí Formation of Argentina.
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Chelonoidis lutzae Zacarias et al. p. 305 figs. 3-5 |
| 2014 | Chelonoidis lutzae de la Fuente et al. |
| 2015 | Chelonoidis lutzae Rhodin et al. |
| 2018 | Chelonoidis lutzae de la Fuente et al. |
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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 lutzae Zacarias et al. 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. G. Zacarias et al. 2013 | Giant continental tortoise of the genus Chelonoidis. Lateral margins not parallel, as a consequence of the projection of the external plates of the anterior and posterior margins of the carapace; free lateral margins of dorsal and peripheral plates of bridges lobed. Proximal depression very marked, with a clear subeliptical shape on the III peripheral plates in both sides of the dorsal carapace. It shows a wide subromboidal entoplastron with a distal projection that completely crosses the pectoral scale. Chelonoidis lutzae sp. nov. differs from Ch. chilensis, Ch. petersi, Ch. nigra and Ch. gringorum because the posterior lobe of the plastron is narrower than the plastral anterior lobe, and the humerus presents a greater curvature in the diaphysis. In turn, it differs from Ch. nigra because the shell is thicker, the plastral lobes are more elongated and it shows thicker epiplastral projections than those observed in Ch. nigra. It differs from Ch. denticulata and Ch. carbonaria because the carapace is oval in shape, and the humerus shows its anterior end clearly expanded. It differs from ?Ch. gallardoi by a lesser development of the xiphiplastral and epiplastral projections, as well as by the absence in male specimens of anal swelling. Finally, it dffers from ?Ch. australis by lobed margins on the peripheral plates of the bridge and because of the shape of entoplastron. | |
| M. S. de la Fuente et al. 2018 | Member of Testudinidae based on the following characters: well-developed plastral buttresses that are in clear contact with the costal bones; coincidence of costo-peripheral sutures with pleuro-marginal sulci; fusion of twelfth marginal scutes; presence of a well-developed epiplastral lip; fused trochanters of the femur. Member of Chelonoidis based on the absence of cervical scute. Chelonoidis lutzae is characterised by not having parallel lateral margins of the shell. Very marked proximal depression, with a clear sub-elliptic shape on the III peripheral plates. It differs from all known Chelonoidis on the presence of a large sub–rhomboidal entoplastron with a distal projection that is crossed by the pectoral scute. It differs from Chelonoidis chilensis, Ch. nigra and Ch. gringorum on the following characters: posterior lobe of plastron narrower than the anterior lobe; humerus with a greater curvature in the diaphysis. It differs from Ch. nigra complex on the following characters: thicker shell; plastral lobes are more elongated; thicker epiplastral projections. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Ernst and Barbour 1989 | |||||