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Diaphorocetus

Diaphorocetus
Temporal range: Early Miocene (Deseadan-Colhuehuapian)
~23.03–20.43 Ma
↓
Diaphorocetus poucheti skull
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Superfamily: Physeteroidea
Family: incertae sedis
Genus: †Diaphorocetus
Ameghino, 1894
Species

D. poucheti (type)

Synonyms
  • Hypocetus Lydekker 1893
  • Mesocetus Moreno 1892
  • Paracetus Lydekker 1893

Diaphorocetus is an extinct genus of odontocete cetacean belonging to Physeteroidea. Its remains were found in the Monte León Formation of Argentina, dating to the Early Miocene.[1]

Systematics

Diaphorocetus was originally named Mesocetus by Moreno (1892).[2] Lydekker (1893) found that Mesocetus was already in use for an extinct mysticete, so he renamed the sperm whale Hypocetus.[3] Ameghino (1894) too recognized Moreno's name as preoccupied, but unaware of Lydekker's paper, coined his own replacement name Diaphorocetus for Mesocetus.[4] Diaphorocetus was declared a nomen protectum (protected name) by Paolucci et al. (2019) because Hypocetus and Paracetus have not been used as valid since 1899 under Article 23.9 of the Code.[5]

Paleobiology

The small teeth of Diaphorocetus and the bottleneck-like nature of the rostrum suggest that Diaphorocetus employed a feeding strategy intermediate between that of raptorial sperm whales like Acrophyseter and Livyatan and extant sperm whales.[5]

References

  1. ^ Diaphorocetus at Fossilworks.org
  2. ^ Moreno, F. P. 1892. Lijeros apuntes sobre dos generos de cetaceos fosiles de la Republica Argentina. Revista de la Museo La Plata 3, 393–400.
  3. ^ Lydekker, R. 1893 [1894]. Cetacean skulls from Patagonia. Anales del Museo de la Plata 2: 1–13.
  4. ^ Ameghino, F. 1894. Enum�eration synoptique des especes de mammiferes fossiles des formations �eocenes de Patagonie. Boletin de la Academia Nacional de Ciencias en C�ordoba 13: 259–455
  5. ^ a b Florencia Paolucci, Mónica R. Buono, Marta S. Fernández, Felix G. Marx & José I. Cuitiño (2019). Diaphorocetus �poucheti (Cetacea, Odontoceti, Physeteroidea) from Patagonia, Argentina: one of the earliest sperm whales, Journal of Systematic Palaeontology, DOI:10.1080/14772019.2019.1605544


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