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Xenorophus sloanii
Taxonomy
Xenorophus sloanii was named by Kellogg (1923) [aka S 402 W, Sloan Collection]. Its type specimen is USNM 11049, a partial skull (partial skull, missing posterior & basicranium), and it is a 3D body fossil. Its type locality is Woodstock Station, which is in a Rupelian marine marl in the Ashley Formation of South Carolina. It is the type species of Xenorophus.
Synonymy list
| Year | Name and author |
|---|---|
| 1923 | Xenorophus sloanii Kellogg p. 1 figs. Plates 1-2 |
| 1930 | Xenorophus sloanii Hay p. 580 |
| 1967 | Xenorophus sloanii Harland et al. p. 774 |
| 1973 | Xenorophus sloanii Keyes p. 385 |
| 1981 | Xenorophus sloanii Fordyce p. 1041 |
| 1982 | Xenorophus sloanii Fordyce p. 423 |
| 1996 | Xenorophus sloanii Sanders p. 338 |
| 2008 | Xenorophus sloanii Uhen et al. p. 570 |
| 2011 | Xenorophus sloanii Geisler et al. p. 5 figs. Table 1 |
| 2015 | Xenorophus sloanii Sanders and Geisler p. 3 |
| 2023 | Xenorophus sloanii Boessenecker and Geisler p. 42 |
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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.
†Xenorophus sloanii Kellogg 1923
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. D. Uhen et al. 2008 | Extraordinary widening of the proximal end of the premaxillary, extending outward under the maxilla, and the overspreading of the supraorbital process by the lacrimal, which also sheaths much of the orbit; nasals situated on a level with the postorbital extension of the supraorbital process; nasal passages slope backward; maxilla slopes abruptly downwards in front of the orbit; intertemporal constriction present (Kellogg 1923a, Whitmore and Sanders, 1977). | |
| R. W. Boessenecker and J. H. Geisler 2023 | A large xenorophid dolphin with approximate adult condylobasal length of 74 cm and bizygomatic width of 29–30 cm and differing from Xenorophus simplicidens in possessing anteroposteriorly longer nasals (22–29% of bizygo- matic width vs. 16–19% in X. simplicidens), nasal process of premaxilla possessing lateral overhanging crest adjacent to bony nares in adult specimens, left antorbital fossa longer than right (right antorbital anteroposteriorly longer than left in Xenorophus simplicidens), longer supraorbital process (distance from antorbital notch to posterior margin supraor- bital process 43% of bizygomatic width vs. 34% in X. simplicidens), nasals that broaden posteriorly and approximate or exceed nares width, left and right palatines separated by anteroposteriorly short median triangular exposure of maxilla, paroccipital processes extending posterior to occipital condyles, shorter median furrow on the tympanic bulla, more teeth with accessory denticles (on PC5–9 as opposed to PC7–9 in X. simplicidens), more accessory denticles per tooth (five distal cusps vs. three in X. simplicidens; three–four mesial cusps vs. one–three in X. simplicidens), and more rugose enamel throughout the dentition, with nodular enamel present on PC5–9 (only present on PC7–9 in X. simplicidens and less rugose than in X. sloanii). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||