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Xiphiacetus
Taxonomy
Xiphiacetus was named by Lambert (2005). It was considered monophyletic by Uhen et al. (2008), Geisler et al. (2011).
It was assigned to Eurhinodelphinidae by Lambert (2005), Whitmore and Kaltenbach (2008), Uhen et al. (2008), Geisler et al. (2011), Bianucci and Varola (2014), Marx et al. (2016), Godfrey et al. (2017), Hastings and Dooley (2017), Berta (2017), Lambert and Goolaerts (2022), Godfrey and Lambert (2023).
It was assigned to Eurhinodelphinidae by Lambert (2005), Whitmore and Kaltenbach (2008), Uhen et al. (2008), Geisler et al. (2011), Bianucci and Varola (2014), Marx et al. (2016), Godfrey et al. (2017), Hastings and Dooley (2017), Berta (2017), Lambert and Goolaerts (2022), Godfrey and Lambert (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Xiphiacetus Lambert p. 212 |
| 2008 | Xiphiacetus Uhen et al. p. 573 |
| 2008 | Xiphiacetus Whitmore and Kaltenbach p. 197 |
| 2011 | Xiphiacetus Geisler et al. p. 5 figs. Table 1 |
| 2014 | Xiphiacetus Bianucci and Varola p. 118 |
| 2016 | Xiphiacetus Marx et al. p. 127 |
| 2017 | Xiphiacetus Berta p. 165 |
| 2017 | Xiphiacetus Godfrey et al. figs. Figure 6 |
| 2017 | Xiphiacetus Hastings and Dooley p. 83 |
| 2022 | Xiphiacetus Lambert and Goolaerts |
| 2023 | Xiphiacetus Godfrey and Lambert p. 101 |
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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.
G. †Xiphiacetus Lambert 2005
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†Xiphiacetus bossi Kellogg 1925
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Invalid names: Eurhinodelphis morrisi Myrick 1979 [synonym], Eurhinodelphis vaughni Myrick 1979 [synonym], Priscodelphinus productus Du Bus 1872 [synonym]
†Xiphiacetus cristatus Du Bus 1872
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Invalid names: Eurhinodelphis ashbyi Myrick 1979 [synonym], Eurhinodelphis whitmorei Myrick 1979 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. D. Uhen et al. 2008 | Xiphiacetus differs from Schizodelphis in: more robust skull with more progressiveelevation of the premaxillae towares the vertex; medial plate of the maxilla along the vertex less concave and less erected; thicker supraorbital process; rostrum generally relatively wider at its base. It differs from Ziphiodelphis in: narrower and ticker triangular part of the premaxilla medially to premaxillary foramen, lacking the more regular flatness and lateral slope seen in Ziphiodelphis; mesorostral groove widely open at that level; posterolaterally shorter plate of the maxilla along the vertex giving the posterodorsal outline of the skull a more rounded aspect in lateral view. It differs from Eurhinodelphis in: maxillary part of the rostrum relatively shorter; dorsomedian portion of the supraoccipital shield concave; less elevated and wider paroccipital process of the exoccipital with lower occipital condyles. It differs from Argyrocetus in: relatively wider face; more elevated vertex ith nasal longer than wide, at the same level or lower than the frontal; more erected supraoccipital shield. It differs from Macrodelphinus in: more elevated and more transversly compressed vertex withnasal as long as wide or longer than wide, and forntal as long as, or shorter than the nasal: supraoccipital shield closer to the vertical. It differs from Mycteriacetus in: relatively wider cranium; more elevated vertex with nasal at the same level or lower than the frontal, and frontal as long as, or shorter than the nasal; more erected supraoccipital shield (Lamert, 2005b). |