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Diaphorocetus poucheti
Taxonomy
Mesocetus poucheti was named by Moreno (1892) [no specimen number listed in Moreno]. It is a 3D body fossil. Its type locality is Puerto Madryn, which is in a Burdigalian marginal marine siltstone/sandstone in the Gaiman Formation of Argentina.
It was recombined as Paracetus poucheti by Lydekker (1894); it was recombined as Hypocetus poucheti by Lydekker (1894), Hay (1902); it was misspelled as Diaphorocetus pouchetti by Perez et al. (2011); it was recombined as Diaphorocetus poucheti by Ameghino (1894), Trouessart (1898), Ameghino (1901), Trouessart (1904), Cabrera (1926), Kellogg (1942), Cozzuol (1996), Kazár (2002), Hampe (2006), Paolucci et al. (2020), Lambert et al. (2023).
It was recombined as Paracetus poucheti by Lydekker (1894); it was recombined as Hypocetus poucheti by Lydekker (1894), Hay (1902); it was misspelled as Diaphorocetus pouchetti by Perez et al. (2011); it was recombined as Diaphorocetus poucheti by Ameghino (1894), Trouessart (1898), Ameghino (1901), Trouessart (1904), Cabrera (1926), Kellogg (1942), Cozzuol (1996), Kazár (2002), Hampe (2006), Paolucci et al. (2020), Lambert et al. (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1892 | Mesocetus poucheti Moreno p. 395 figs. Plate X |
| 1894 | Diaphorocetus poucheti Ameghino p. 437 |
| 1894 | Hypocetus poucheti Lydekker p. 7 |
| 1894 | Paracetus poucheti Lydekker p. 8 |
| 1898 | Diaphorocetus poucheti Trouessart p. 1052 |
| 1901 | Diaphorocetus poucheti Ameghino p. 80 |
| 1902 | Hypocetus poucheti Hay p. 596 |
| 1904 | Diaphorocetus poucheti Trouessart p. 772 |
| 1926 | Diaphorocetus poucheti Cabrera p. 408 |
| 1942 | Diaphorocetus poucheti Kellogg p. 448 |
| 1996 | Diaphorocetus poucheti Cozzuol p. 324 |
| 2002 | Diaphorocetus poucheti Kazár p. 163 |
| 2006 | Diaphorocetus poucheti Hampe p. 76 |
| 2011 | Diaphorocetus pouchetti Perez et al. p. 648 |
| 2020 | Diaphorocetus poucheti Paolucci et al. |
| 2023 | Diaphorocetus poucheti Lambert et al. p. 662 |
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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.
†Diaphorocetus poucheti Moreno 1892
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Paolucci et al. 2020 | Small-sized physeteroid (3.5–4 m long) characterized by the following unique combination of characters: dorsoventrally flattened skull with an oblique occipital shield, rostrum shaped like a bottle- neck and contributing 50% of CBL, at least 10 deep maxillary alveoli separated by wide interalveolar septa, supracranial basin low and not extending onto the ros- trum or right orbit, and temporal fossa wide and short. Differs from other physeteroids in having a zygomatic process of the squamosal with a ventrally deflected (rather than horizontal) apex; from physeterids in having a ventrally oriented postorbital process of the frontal; from ‘Aulophyseter’ rionegrensis in having a smaller skull (11%, based on BZW), wide and well-developed upper interalveolar septa, an obliquely oriented occipital shield, a dorsoventrally flattened skull, a shorter tem- poral fossa and a narrower exposure of the parietal in the temporal fossa; from Idiorophus in having a smaller skull, an open mesorostral groove, a flatter cranium and smaller dorsal infraorbital foramina; from Aulophyseter morricei in having a narrower tip of the rostrum, an open mesorostral groove, a longer zygomatic process (ratio between length of zygomatic process and CBL 1⁄4 0.29), a longer temporal fossa and less posteriorly pro- truding occipital condyles; from Placoziphius in having deep alveoli, a larger palatal exposure of the vomer, and a more open jugular notch; from Eudelphis in having thick and well developed upper interalveolar septa, a rostrum shaped like a bottleneck and a dorsoventrally shorter postglenoid process; from Physeterula in having a smaller (by c. 30%) and more flattened cranium, and a convex occipital shield (in lateral view); from Orycterocetus crocodilinus in having a convex occipital
shield, a lower supracranial basin, deep upper alveoli and wider upper interalveolar septa; from Idiophyseter in having less posteriorly protruding occipital condyles, a more laterally situated right premaxillary foramen and a flattened skull; from Physeter in having a smaller skull (by c. 70%) whose long axis is roughly horizontal, a supracranial basin that does not extend onto the ros- trum, deep upper alveoli, a convex occipital shield, a lower supracranial basin and a rostrum that is shaped like a bottleneck; from Kogiidae in having a longer ros- trum, and in lacking a sagittal crest; and from Livyatan, Zygophyseter and Acrophyseter in having a smaller tem- poral fossa, smaller teeth (greatest transverse diameter of root < 5% of BZW) and a flattened skull. |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Uhen 2004, Nowak 1991 | |||||
Age range: Burdigalian or 20.45000 to 15.98000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | Argentina (Chubut) | Mesocetus poucheti (type locality: 45885) |