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Eurysternum neuquinum
Taxonomy
Eurysternum neuquinum was named by Fernandez and de la Fuente (1988). Its type specimen is MLP-86-III-30-2, a partial skeleton, and it is a 3D body fossil.
It was recombined as Neusticemys neuquina by Fernandez and de la Fuente (1993), Gasparini et al. (1997), De La Fuente and Fernandez (2011), Anquetin et al. (2017), Gonzalez Ruiz et al. (2019).
It was recombined as Neusticemys neuquina by Fernandez and de la Fuente (1993), Gasparini et al. (1997), De La Fuente and Fernandez (2011), Anquetin et al. (2017), Gonzalez Ruiz et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Eurysternum neuquinum Fernandez and de la Fuente figs. 5D,E; 6D,E |
| 1993 | Neusticemys neuquina Fernandez and de la Fuente |
| 1993 | Eurysternum neuquinum de Broin and de la Fuente p. 13 |
| 1997 | Neusticemys neuquina Gasparini et al. |
| 2011 | Neusticemys neuquina De La Fuente and Fernandez |
| 2017 | Neusticemys neuquina Anquetin et al. |
| 2019 | Neusticemys neuquina Gonzalez Ruiz 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.
†Eurysternum neuquinum Fernandez and de la Fuente 1988
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Anquetin et al. 2017 | Neusticemys neuquina lacks diagnostic characters of Thalassochelydia, but several characteristics may indicate close relationships with “eurysternids” and/or “thalassemydids” (see below). Neusticemys neuquina differs from all other thalas- sochelydians in having a depressed anterolateral carapacial rim, developed costo-peripheral fontanelles, a moderate medial keel along the posterior third of the carapace, large lateral and cen- tral plastral fontanelles, a ligamentous bridge, elongation of fore- limb and hindlimb, elongation of pedal digit V, and a long tail. | |
| P. Gonzalez Ruiz et al. 2019 | Neusticemys neuquina belongs to the clade Testudinata because it has a complete carapace and plastron enclosing the pectoral girdle. It is included inside Angolachelonia according to: the posterior orientation of the articular process of the quadrate; the presence of a prominent, ventrally infolding ridge of the posterior surface of the processus articularis of the quadrate; the long interpterygoid contact; and a pterygoid contact with the mandibular articular surfaces of the quadrate. It can be identified as a member of Thalassochelydia by: the anterolateral recess of the anterior surface of the quadrate lateral to the processus trochlearis oticum; the presence of a fossa on the supraoccipital-opisthotic-exoccipital contact area; the foramina anterius caroticus cerebralis found close together, but as independent foramina in the basisphenoid; the presence of the splenial in the mandible; lack of lateral ossifications of the costals, allowing the dorsal exposure of the distal end of ribs and the development of fontanelles only at the most anterior and posterior costals; the presence of rib-free peripherals; two to four vertebral scutes significantly broader than pleurals; and the central articulation of cervical vertebrae not formed. It differs from other Thalassochelydia by possessing a round depression on the ventral surface of the basisphenoid; a relatively larger oval foramen nervi trigemini; reduced and steepened triturating surfaces in both the maxilla and dentary; a flattened and wide carapace of moderate to large size (maximum carapace length 501 mm); a bound keel in the posterior third of the carapace; anterolateral margins of the carapace that are rectilinear and elongated, resulting in an anteroposterior elongation of the carapace; relatively elongated anterior and posterior limbs with flattened carpal and tarsal elements; and an elongated V digit in the pes. |