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Rayanistes
Taxonomy
Rayanistes was named by Bebej et al. (2015). Its type is Rayanistes afer.
It was assigned to Remingtonocetidae by Bebej et al. (2015) and Berta (2017).
It was assigned to Remingtonocetidae by Bebej et al. (2015) and Berta (2017).
Species
R. afer (type species)
Synonymy list
Year | Name and author |
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2015 | Rayanistes Bebej et al. |
2017 | Rayanistes Berta p. 159 |
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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
Reference | Diagnosis | |
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R. M. Bebej et al. 2015 | Rayanistes 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
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Source: o = order | |||||
Reference: Uhen 2004 |