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Chelonoidis marcanoi
Taxonomy
Chelonoidis marcanoi was named by Turvey et al. (2017). Its type specimen is NHMUK PV R 36954, a set of limb elements (Right humerus), and it is a 3D body fossil. Its type locality is Cueva del Papayo, which is in a Pleistocene/Holocene terrestrial horizon in the Dominican Republic.
It was considered a nomen dubium by Albury et al. (2018) and Vlachos (2018).
It was considered a nomen dubium by Albury et al. (2018) and Vlachos (2018).
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Chelonoidis marcanoi Turvey et al. p. 4 figs. 2-6 |
| 2022 | Chelonoidis marcanoi Viñola-López and Almonte |
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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 marcanoi Turvey et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. T. Turvey et al. 2017 | Thin-shelled, large-bodied testudinid tortoise with adult humerus much larger than in C. alburyorum but probably smaller than in C. sombrerensis; humerus more slender than in C. alburyorum or C. cubensis; M. latissimus dorsi muscle scar on lateral surface better defined than in C. monensis but not as prominent as in C. cubensis; humeral shaft rounded/oval or slightly triangular and approximately as long as wide in middle shaft cross-section, unlike the narrower, deeper shaft of C. cubensis. Femur with maximum distal width markedly greater than maximum proximal width in single available young specimen, versus the equal proximal and distal widths shown by C. alburyorum. External carapace surface showing sulci with edges raised as distinct low ridges, unlike the indistinct and scarcely apparent sulci of C. monensis, C. sombrerensis, and the undescribed giant tortoises from Navassa and New Providence; gular scutes much shorter than in C. cubensis, with sulci defining their posterior border curving posteriorly rather than anteriorly as in C. alburyorum. | |
| L. W. Viñola-López and J. N. Almonte 2022 | Medium-size tortoise of the Greater Antilles Chelonoidis group (C. cubensis, C. gersoni sp. nov.) based on the presence of thin shell, prominent bony ridges in costal sulci, and strong epiplastral shelf that separates gular from the internal floor of the lobe. It differs from other species in the group based on the presence of an oval entoplastron (subtriangular in C. cubensis) with a prominent two-part brow on the upper part of the entoplastron and a very thin keel separating a prominent pair of fossae (one low brow with a wide and low keel separating a shallow pair of fossae in C. gersoni sp. nov.). Humerus with shallow muscle scar for M. latissimus dorsi and medial process significantly above the humeral head. |