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Rayanistes

Mammalia - Cetacea - Remingtonocetidae

Taxonomy

Species
R. afer (type species)

Synonymy list
YearName and author
2015Rayanistes Bebej et al.
2017Rayanistes Berta p. 159

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
Whippomorpha
orderCetacea
familyRemingtonocetidae
genusRayanistes

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.

G. †Rayanistes Bebej et al. 2015
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Rayanistes afer Bebej et al. 2015
Diagnosis
ReferenceDiagnosis
R. M. Bebej et al. 2015Rayanistes afer shares remingtonocetid features including a sacrum that is narrow and long (minimal biauricular breadth to sacral length ratio of 0.42); an innominate with a
bladelike ilium and bladelike ischium rising sharply from the body anterior and posterior to the acetabulum; a large, deep acetabulum with a sharp rim and a narrow acetabular notch (ratio of notch width to acetabulum diameter of 0.09); and a femur with dense cortical bone and lacking a distinct fovea capitis femoris. Rayanistes afer is distinctive among remingto- nocetids in having the neural spine on L6 angled posteriorly; an innominate with an ilium that is lower dorsally and an ischium that extends much higher dorsally; and in having a femur with a shorter neck, more vertically oriented head, and more circular diaphyseal cross-section with no distinct lateral flange.

Rayanistes afer is closest to Remingtonocetus domandaensis and Remingtonocetus harudiensis in size but differs (to the extent they can be compared) from Remingtonocetus and Dalanistes in orientation of the neural spine on the last lumbar vertebra (Fig. 3); relative development of the ilium and ischium on the innominate (Fig. 4); and orientation of the head, length of the neck, and robustness of the greater trochanter on the femur (Fig. 6). Rayanistes afer differs from Andrewsiphius sloani in being larger, and in the orientation and relative size of the femoral head. Rayanistes afer is closest in innominate morphology to Ambulocetus natans, but differs in having a larger acetabulum (Fig. 4), a narrower acetabular notch (Fig. 5), and a much shorter femur with a larger femoral head (Fig. 6).
Measurements
No measurements are available
Composition: hydroxyapatiteo
Form: roller-shapedo
Ontogeny: modification of partso
Environment: marineo
Locomotion: actively mobileo
Life habit: aquatico
Depth habitat: surfaceo
Diet: carnivoreo
Reproduction: viviparouso
Created: 2005-03-06 14:19:05
Modified: 2017-04-17 10:41:18
Source: o = order
Reference: Uhen 2004

Age range: Lutetian or 47.80000 to 41.30000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Lutetian47.8 - 41.3Egypt Remingtonocetidae indet. (96948)