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Borealodon

Mammalia - Ungulata

Taxonomy
Borealodon was named by Shipps et al. (2019). Its type is Borealodon osedax.

It was assigned to Mysticeti by Shipps et al. (2019).

Synonymy list
YearName and author
2019Borealodon Shipps et al. p. 3 figs. Figs. 1-10

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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()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
orderUngulata(Linnaeus 1766)
orderArtiodactyla()
Cetacea()
Pelagiceti
Neoceti
suborderMysticeti
genusBorealodon

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
B. K. Shipps et al. 2019Borealodon is identified as a Neoceti based on the following derived characters, absent in stem cetaceans: loss of sagittal crest; supraoccipital shield anterodorsally inclined. Borealodon can be identified as belonging to the lineage of Mysticeti based on the following derived characters: presence of a maxillary infraorbital plate; and a triangular supraoccipital shield. Borealodon is differentiated from Mammalodontidae by having a posterior portion of the maxilla situated lateral to the nasals and the premaxilla (character 20, state 2); a deep suprameatal fossa of the periotic (character 218, state 0); and a medial lobe of the tympanic bulla that is transversely wider than the lateral lobe (character 244, state 0). Borealodon is also differentiated from Aetiocetidae in having an anterior process of the periotic that is dorsoventrally deepest within the anterior 50% of the anterior process (character 180, state 1); a periotic with a proximal opening of the facial canal that is larger than the aperture for the vestibular aqueduct (character 190, state 0); and a medial lobe of the tympanic bulla that is transversely wider than the lateral lobe in ventral view (character 244, state 0). Borealodon preserves the following combination of character states: a frontal that lies at the same dorsoventral height as the nasals (character 86, state 1); and a periotic with a crista transversa that is deeply recessed within the internal acoustic meatus (character 219, state 1).
Measurements
No measurements are available
Composition: hydroxyapatitesubo
Form: roller-shapedo
Ontogeny: modification of partso
Environment: marinesubo
Locomotion: actively mobileo
Life habit: aquaticsubo
Depth habitat: surfaceo
Diet: carnivoresubo
Diet 2: suspension feedersubo
Reproduction: viviparouso
Created: 2005-03-06 14:20:41
Modified: 2005-03-06 16:34:40
Source: subo = suborder, o = order
Reference: Uhen 2004

Age range: Rupelian or 33.90000 to 28.10000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Rupelian33.9 - 28.1USA (Washington) B. osedax (58964)