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Frisiphoca aberratum

Mammalia - Carnivora - Phocidae

Taxonomy
Monotherium aberratum was named by Vanden Broeck (1874) [No type specimen number listed by Van Beneden (1876).]. It is a 3D body fossil. Its type locality is Sablesmoyens d'Anvers, which is in a Tortonian lagoonal sandstone in the Diest Formation of Belgium. It is the type species of Frisiphoca.

It was recombined as Monatherium aberratum by Trouessart (1898), Trouessart (1904) and Friant (1947); it was considered a nomen dubium by Berta et al. (2015); it was recombined as Frisiphoca aberratum by Dewaele et al. (2018).

Synonymy list
YearName and author
1874Monatherium aberratum Vanden Broeck p. 199
1874Monotherium aberratum Vanden Broeck p. 199
1876Monotherium aberratum Van Beneden p. 801
1898Monatherium aberratum Trouessart p. 380
1904Monatherium aberratum Trouessart p. 283
1922Monotherium aberratum Kellogg p. 113
1947Monatherium aberratum Friant p. 5
1972Monotherium aberratum Hendey p. 100
1976Monotherium aberratum Ray p. 394
2001Monotherium aberratum Koretsky p. 86
2003Monotherium aberratum Deméré et al. p. 63
2014Monotherium aberratum Koretsky and Domning p. 227
2018Frisiphoca aberratum Dewaele et al. p. 14 figs. Figure 4a–d, i–l

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
RankNameAuthor
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
Laurasiatheria
Scrotifera
Ferae()
CarnivoramorphaWyss and Flynn 1993
CarnivoraformesFlynn et al.
orderCarnivoraBowditch 1821
superfamilyArctoideaFlower 1869
Pinnipedimorpha
Pinnipedia()
familyPhocidae
subfamilyPhocinae
genusFrisiphoca
speciesaberratum()

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
ReferenceDiagnosis
L. Dewaele et al. 2018Identification as a phocid seal supported by the large development of the deltopectoral crest on the humerus. Identified as a phocine based on the presence of an entepicondylar foramen (also in Homiphoca capensis) and the overall slenderness. Differs from most Phocinae by having a very strongly reduced humeral neck (also in Histriophoca fasciata, Leptophoca proxima and Pagophilus groenlandicus). Differs from all Phocidae in the following unique combination of characteristics: lesser tubercle slightly below the level of the humeral head (also in Devinophoca emryi, Le. proxima, Monachopsis pontica, Nanophoca vitulinoides, Pachyphoca chapskii, Pachyphoca ukrainica, Praepusa vindobonensis, Properiptychus argentinus and Sarmatonectes sintsovi), transverse bar in bicipital groove (also in Lobodon carcinophaga, Monachus monachus, Ommatophoca rossii, Piscophoca pacifica and Pliophoca etrusca), deep fossa for m. triceps brachii distal to the humeral head (also in Pi. pacifica), and deltopectoral crest tapering smoothly distally (also in Australophoca changorum, Acrophoca longirostris, Cryptophoca maeotica, De. emryi, Kawas benegasorum, Messiphoca mauretanica, Mo. pontica, Pachyphoca chapskii, Pachyphoca ukrainica, Pi. pacifica, Pl. etrusca, Pra. vindobonensis, Prophoca rousseaui, Properiptychus argentinus and S. sintsovi).