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Zarhinocetus
Taxonomy
Zarhinocetus was named by Barnes and Reynolds (2009).
It was assigned to Squalodelphinidae by Marx et al. (2016); and to Allodelphinidae by Barnes and Reynolds (2009), Boessenecker (2011), Boersma and Pyenson (2016), Kimura and Barnes (2016), Godfrey et al. (2017), Berta (2017).
It was assigned to Squalodelphinidae by Marx et al. (2016); and to Allodelphinidae by Barnes and Reynolds (2009), Boessenecker (2011), Boersma and Pyenson (2016), Kimura and Barnes (2016), Godfrey et al. (2017), Berta (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Zarhinocetus Barnes and Reynolds p. 487 |
| 2011 | Zarhinocetus Boessenecker p. 2 figs. Table 1 |
| 2016 | Zarhinocetus Boersma and Pyenson p. 12 figs. Figure 10 |
| 2016 | Zarhinocetus Kimura and Barnes p. 30 |
| 2016 | Zarhinocetus Marx et al. p. 127 |
| 2017 | Zarhinocetus Berta p. 163 |
| 2017 | Zarhinocetus Godfrey et al. figs. Figure 6 |
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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. †Zarhinocetus Barnes and Reynolds 2009
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†Zarhinocetus donnamatsonae Kimura and Barnes 2016
†Zarhinocetus errabundus Kellogg 1931
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Kimura and L. G. Barnes 2016 | A genus of the family Allodelphinidae differing from Allodelphis, Goedertius, and Ninjadelphis by having cranium with more depressed medial part of dorsal surface of proximal part of rostrum, enlarged tubercle present on dorsolateral surface of maxilla anterior to antorbital notch, supraorbital process of frontal thicker dorsoventrally, anteroposteriorly-oriented crest present on dorsal surface of supraorbital process of maxilla, bony orbit of larger diameter, dorsal exposures of frontals on cranial vertex asymmetrical with midline suture located to left of cranial midline, zygomatic process of squamosal nearly rectangular in lateral view rather than arc shaped, nuchal crest curving anteriorly at apex posterior to cranial vertex, occipital shield larger and more vertically oriented, occipital condyles proportionally larger; petrosal more massive, with anterior process more robust, posterior process shorter, posterior articular facet for tympanic bulla smaller; tympanic bulla with outer lip more inflated; atlas vertebra relatively larger and more massive; humerus proportionally larger in relation to body size, with more stout diaphysis and relatively larger humeral head; and radius and ulna shorter than humerus; differing further from Allodelphis and Goedertius by having cranium with posterior end of premaxilla retracted anteriorly from proximity of nasal bone, terminating on lateral side of dorsal nares, area where posterior end of premaxilla formerly existed, forming premaxillary sac fossa, instead formed of smooth, convex, and dense maxilla, nasal bones smaller, narrower anteriorly, fused to each other along midline suture, and fused to underlying frontals; petrosal with relatively larger cochlear portion; atlas vertebra with dorsal transverse process expanded dorsoventrally; and differing further from Goedertius by having cranium with smaller nasal bones, nasal bones nearly unrecognizable because of fusion to each other and to underlying frontal bones; differing further from Ninjadelphis by having petrosal with posterior articular facet for tympanic bulla not divided into two surfaces; mandible more flattened dorsoventrally in posterior part of symphyseal region; atlas vertebra relatively larger and more robust, with dorsal transverse process larger and more expanded dorsoventrally, and ventral transverse process more massive and shorter. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Langhian to the top of the Serravallian or 15.98000 to 11.63000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian - Langhian | USA (Washington) | Z. donnamatsonae (125136) | |
| Langhian | USA (California) | Squalodon errabundus (19595 100258) | |
| Langhian - Serravallian | USA (California) | Z. errabundus (151009) | |
| Serravallian | USA (California) | Squalodon errabundus (58987) |