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Mendozachelys wichmanni
Taxonomy
Mendozachelys wichmanni was named by de la Fuente et al. (2017). Its type specimen is MACN-Pv-Mz 2, a skeleton, and it is a 3D body fossil. Its type locality is Ranquil-Có taphofacies 1, which is in a Campanian/Maastrichtian marginal marine siltstone/claystone in the Loncoche Formation of Argentina. It is the type species of Mendozachelys.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Mendozachelys wichmanni de la Fuente et al. p. 150 figs. 2-9 |
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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.
†Mendozachelys wichmanni de la Fuente et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. S. de la Fuente et al. 2017 | It is a pleurodire turtle because of the presence of a processus trochlearis pterygoidei in the skull and the attachment by sutures of the pelvic girdle to the shell. It is a Pan-Chelidae because of the presence of a second opisthocoelous, fifth bicon- vexe, sixth procoelous and a seventh biconcave cervical vertebrae in the neck. It differs from other known extant and extinct Pan-Chelidae taxa by its large size (carapace length be estimated in 950 mm) and by the unique combination of cranial and postcraneal characters such as: a cranial condylus mandibularis of the quadrate divided by a deep furrow in two slightly plane-convex surfaces that fit well with the concave articulation of the area articularis man- dibularis in the lower jaw; the narrow triturating surface of the dentary is limited laterally by a sharp and high labial ridge and by a medial, lower lingual ridge, both rami of the dentaries are fused at the mandibular symphysis where a hook is formed; at the tritu- rating surface of the symphysis a sharp ridge connects the labial and lingual ridges; the odd carapace bone series begins with a subpentagonal nuchal bone longer than wide with a slightly anterior indentation followed by a continued and incomplete neural series separated from suprapygal bone by the midline con- tact of costal 7 to 8; a long cervical scute is twice longer than wide; the vertebral 1 is the widest scute of the vertebral series; the marginal scutes 1 are quadrangular in outline, and represent the smallest scutes of the marginal series; the anterior plastral lobule is relatively short and wide, wider than the posterior one; the ante- rior plastral lobule width is more than twice its length, and shows a slight epiplastral notch; short epiplastral suture that represents 36 per cent of the entoplastron length; cuneiform short and wide mesoplastra without traces of a pectoroabdominal sulci are ar- ranged between the large hyo and hypoplastra; a curved lateral margin of the posterior plastral lobule that become slightly straight after a femoro-anal notch; the processes that bear the post- zygapophyses in the sixth procoelus cervical vertebra are extremely wide and extended beyond the posterior condyle, these processes have three longitudinal keels: one medial and two lateral separated by shallow troughs. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Ernst and Barbour 1989, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Mendoza) | Mendozachelys wichmanni (type locality: 182521) |