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Helianthochelys redondita
Discussion
Species LSID. urn:lsid:zoobank.org:act:9A2CBBBB-AFF4-453E-81CD-7A0D1F6B1876 The specific name, redondita, refers to the type locality Estancia La Redonda Chica, hence the Latin diminutive -ita in the end.
Taxonomy
Helianthochelys redondita was named by Sterli et al. (2025). Its type specimen is MPEF-PV 10918, a partial skeleton (almost complete carapace (secondary ossicles and nuchal bone) with a putative skull fragment (jugal) and postcranial elements (cervical vertebrae 4, 7, and 8, t), and it is a 3D body fossil. Its type locality is Estancia La Redonda Chica, which is in a Burdigalian offshore sandstone in the Gaiman Formation of Argentina. It is the type species of Helianthochelys.
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Helianthochelys redondita Sterli 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.
†Helianthochelys redondita Sterli et al. 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Sterli et al. 2025 |
Differs from Natemys and is associated with more derived helianthophores in the absence of some elongated ossicles and the presence of anteroposterior ridges. Differs from the type of Psephophorus polygonous and is associated with other closely related taxa from the Atlantic coasts (e.g., Psephophorus scaldii and Westerschelde specimen from Europe and Psephophorus calvertensis from the Atlantic side of North America) due to the absence of change of curvature until the tip of the ridge, in cross-section. Differs from all these Atlantic helianthophores based on the presence of secondary (and even tertiary) anteroposterior ridges between the five primary ridges. Differs from the Westerschelde specimen and Psephophorus calvertensis and is more closely related to Psephophorus scaldii based on higher counts of ray ossicles around the central disk ossicle (up to 13 ossicles) and the presence of comparatively thinner, medium-thick (0.61.1 cm) ossicles as well. Differs from Psephophorus scaldii based on the disk/ray pattern: Helianthochelys redondita has usually three ray ossicles between two successive disk ossicles, whereas Psephophorus scaldii has, usually, a single ray ossicle between two successive disk ossicles. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Carroll 1988, Kiessling 2004, Uetz 2005, Hendy et al. 2009 | |||||
Age range: Burdigalian or 20.45000 to 15.98000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Miocene | Argentina (Chubut) | Dermochelyidae indet. (208497) | |
| Burdigalian | Argentina (Chubut) | Dermochelyidae indet. (45886 type locality: 208504) |