Pachyphoca

Pachyphoca; Temporal range: Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Clade:	Pinnipedia
Family:	Phocidae
Subfamily:	Phocinae
Tribe:	Cystophorini
Genus:	†Pachyphoca; Koretsky and Rahmat, 2013
Species
	P. ukrainica Koretsky and Rahmat, 2013 (type species); P. chapskii Koretsky and Rahmat, 2013; P. volkodavi Tarasenko, 2022;

Pachyphoca is an extinct genus of earless seals from Neogene marine deposits in the northern part of the Paratethys basin.

Description

There are three recognized species of Pachyphoca: P. ukrainica, P. volkodavi, and P. chapskii. Both P. ukrainica and P. chapskii have been found in Serravallian-Tortonian-aged marine deposits in Ukraine.^[1] P. volkodavi, the newest of the three species to be discovered, were discovered from seal remains from Upper Miocene deposits in the Republic of Adygea.^[2] Pachyphoca ukrainica was the smaller of the two species, and shows more adaptations for terrestrial locomotion compared to the larger P. chapskii.^[3]

The aforementioned species of the genus Pachyphoca exhibited thick and dense bones that are characteristic of pachyosteosclerosis. It is believed that seals with such an adaptation dive to shallow depths and swim slowly allowing them to hunt slow moving bottom preys.^[2]

References

^ I. A. Koretsky and S. J. Rahmat. 2013. First record of fossil Cystophorinae (Carnivora, Phocidae): Middle Miocene seals from the northern Paratethys. Rivista Italiana di Paleontologia e Stratigrafia 119(3):325-350.
^ ^a ^b Tarasenko, K. K. (November 2022). "A New Seal Species of the Genus Pachyphoca (Cystophorinae, Phocidae) from the Late Miocene of the North Caucasus". Doklady Earth Sciences. 507 (1): 916–919. doi:10.1134/S1028334X22600621. ISSN 1028-334X.
^ Berta, Annalisa (2017). The Rise of Marine Mammals: 50 Million Years of Evolution. Johns Hopkins University Press. p. 106. ISBN 9781421423265.

[1] I. A. Koretsky and S. J. Rahmat. 2013. First record of fossil Cystophorinae (Carnivora, Phocidae): Middle Miocene seals from the northern Paratethys. Rivista Italiana di Paleontologia e Stratigrafia 119(3):325-350.

[:0-2] Tarasenko, K. K. (November 2022). "A New Seal Species of the Genus Pachyphoca (Cystophorinae, Phocidae) from the Late Miocene of the North Caucasus". Doklady Earth Sciences. 507 (1): 916–919. doi:10.1134/S1028334X22600621. ISSN 1028-334X.

[Berta-3] Berta, Annalisa (2017). The Rise of Marine Mammals: 50 Million Years of Evolution. Johns Hopkins University Press. p. 106. ISBN 9781421423265.

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