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Hylaeochelys
Taxonomy
Hylaeochelys was named by Lydekker (1889). Its type is Pleurosternon latiscutatum.
It was assigned to Plesiochelyidae by Lydekker (1889), Delair (1958) and Milner (2004); to Pancryptodira by Pérez-García (2012); to Testudines by Pérez-García and Murelaga (2013); to Eucryptodira by Pérez-García and Ortega (2014); and to Thalassochelydia by Allain et al. (2022).
It was assigned to Plesiochelyidae by Lydekker (1889), Delair (1958) and Milner (2004); to Pancryptodira by Pérez-García (2012); to Testudines by Pérez-García and Murelaga (2013); to Eucryptodira by Pérez-García and Ortega (2014); and to Thalassochelydia by Allain et al. (2022).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Archaeochelys Lydekker |
| 1889 | Hylaeochelys Lydekker pp. 185-186 |
| 1889 | Archaeochelys Lydekker pp. 218-219 |
| 1889 | Hylaeochelys Lydekker pp. 513-514 |
| 1938 | Archaeochelys pougeti Bergounioux |
| 1958 | Hylaeochelys Delair p. 52 |
| 2004 | Hylaeochelys Milner p. 1460 figs. Text-figures 1, 2, 5D, 7C, 8B–D, 12 |
| 2012 | Hylaeochelys Pérez-García p. 73 figs. 5-6 |
| 2013 | Hylaeochelys Pérez-García and Murelaga |
| 2014 | Hylaeochelys Pérez-García and Ortega |
| 2022 | Hylaeochelys Allain 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.
G. †Hylaeochelys Lydekker 1889
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†Hylaeochelys belli Mantell 1844
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Invalid names: Archaeochelys valdensis Lydekker 1889 [synonym], Hylaeochelys sollasi Nopcsa 1928 [synonym], Platemys dixoni Owen 1853 [synonym], Platemys mantelli Owen 1841 [synonym]
†Hylaeochelys kappa Pérez-García and Ortega 2014
Invalid names: Archaeochelys Lydekker 1889 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Milner 2004 | Carapace roughly circular with length and breadth subequal. Shallow cervical emargination and no pygal emargination. Carapace characterised by elongate narrow neurals, with neurals 2–4 at least twice as long as wide. Eight neurals and two suprapygals, the first suprapygal a wide rhomboid, three times as wide as long and with posterior width about three times the anterior width. Costal 1 is a rectangle more than twice as long as wide. Costals 3–4 up to four times as wide as long. Mesoplastrals absent. Xiphiplastral not notched. Plastron with plastral fontanelle of varying size. Very short wide cervical scute completely separates first marginals over anterior quarter of the nuchal bone. Vertebral scutes at least twice as wide as they are long and over half the width of the carapace, contra Plesiochelys (e.g. P. etalloni, P. brodiei) in which vertebral scutes are less than twice as wide as they are long. Vertebral scute 1 about half the size of vertebral 2. Vertebral scute 4 extending laterally to reach the ninth marginal bones. Pleural scutes correspondingly reduced, but extending substantially over peripheral plates to cover about one-third of their area. Shell surface is plain or striated bone with no suggestion of smoothness, pitting or pustulation. |