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Inermorostrum xenops

Mammalia - Artiodactyla - Xenorophidae

Taxonomy
Inermorostrum xenops was named by Boessenecker et al. (2017). Its type specimen is CCNHM 171, a partial skull, and it is a 3D body fossil. Its type locality is Wando River + Highway 41 bridge, which is in a Rupelian coastal horizon in the Ashley Formation of South Carolina. It is the type species of Inermorostrum.

Synonymy list
YearName and author
2017Inermorostrum xenops Boessenecker et al. p. 2 fig. 1

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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
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
Cetacea()
Pelagiceti
Neoceti
Odontoceti()
familyXenorophidae
genusInermorostrum
speciesxenops

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
R. W. Boessenecker et al. 2017Inermorostrum xenops differs from all other Odontoceti (except some Ziphiidae and Physeteridae, Australodelphis, Grampus, Monodon, and Odobenocetops) in having a completely toothless maxilla and rostral portion of the maxilla shorter than 50% postorbital skull width. Inermorostrum xenops shares with other Xenorophidae, to the exclusion of all other odontocetes, several features including: (i) nasal process of premaxilla extending posteriorly to contact frontal and excluding maxilla from frontal contact; (ii) nasal process of premaxilla underlying ascending maxilla; (iii) pre- maxilla with lateral crest adjacent to the bony nares; (iv) large antorbital fossa on rostral portion of maxilla; (v) lacrimal expanded over the orbit; and (vi) frontal window posterior to orbit exposing premaxilla in ventral view. Inermorostrum xenops differs from all other Xenorophidae in possessing an anteroposteriorly short, toothless maxilla, and further differs from Cotylocara and Echovenator in lacking a deep postnarial fossa.
Measurements
No measurements are available
Composition: hydroxyapatitesubo
Form: roller-shapedo
Ontogeny: modification of partso
Environment: marine, freshwatersubo
Locomotion: actively mobileo
Life habit: aquatico
Depth habitat: surfaceo
Diet: carnivoresubo
Reproduction: viviparoussubo
Created: 2005-03-06 14:21:39
Modified: 2005-09-22 15:42:08
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 (South Carolina) Inermorostrum xenops (type locality: 186670)