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Petradyptes
Taxonomy
Petradyptes was named by Ksepka et al. (2023). Its type is Petradyptes stonehousei.
It was assigned to Sphenisciformes by Ksepka et al. (2023).
It was assigned to Sphenisciformes by Ksepka et al. (2023).
Species
P. stonehousei (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2023 | Petradyptes Ksepka 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. T. Ksepka et al. 2023 | Differs from all other Paleocene penguins in strongly flattened humerus shaft (midshaft width more than twice midshaft depth). Differs from Muriwaimanu, Sequiwaimanu, and Kupoupou in wider fossa formed by impressio m. pectoralis. Differs from Muriwaimanu, Sequiwaimanu, and Crossvallia in more distally extended insertion scar for m. supracoracoideus. Differs from Kaiika in
proportionally wider humerus shaft, greater proximodistal length of crista bicipitalis, and more proximodistally elongate scar for m. supracoracoideus. We note that the deep groove on the tuberculum ventrale of Kaiika maxwelli, which was originally considered autapomorphic for that species, is more likely to be an artifact of incomplete preservation of the natural mold used to cast the holotype humerus. |