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Taxonomy
Chavinziphius was named by Bianucci et al. (2016). Its type is Chavinziphius maxillocristatus.
It was assigned to Ziphiidae by Bianucci et al. (2016) and Berta (2017).
It was assigned to Ziphiidae by Bianucci et al. (2016) and Berta (2017).
Species
C. maxillocristatus (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Chavinziphius Bianucci et al. p. 4 |
| 2017 | Chavinziphius Berta p. 162 |
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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. †Chavinziphius Bianucci et al. 2016
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†Chavinziphius maxillocristatus Bianucci et al. 2016
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Bianucci et al. 2016 | Chavinziphius differs from all other ziphiids except Berardius and Hyperoodon in the presence of a robust and elevated longitudinal rostral maxillary crest extending from the posterior portion of the rostrum to the anterior portion of the neurocranium, posteromedial to the antorbital notch. Further differs from all other ziphiids in having the following combination of characters: anteroposteriorly elongated premaxillary sac fossa with premaxillary foramen distinctly anterior to the antorbital notch; ascending process of premaxilla gradually rising toward the vertex without ever becoming vertical; premaxillary crest inflated, oriented transversely, and partially in contact with the lateral margin of the nasal; moderate elevation of the vertex of the skull; moderate length of the temporal fossa; presence of three similarly-sized dorsal infraorbital foramina anterior to the base of the rostrum; presence of at least 50 small distinct alveoli for each mandible; unfused mandibles with a triangular cross-section of the symphyseal portion. Differs from Berardiinae in having a supraoccipital that reaches the top of the skull, and having a vertex with a less transversely constricted frontal exposure and no nodular protuberance formed by the interparietal or the frontals; from Nenga, Pterocetus, Xhosacetus, and Hyperoodontinae in lacking the inclusion of the nasal in the premaxillary crest; from Hyperoodontinae in lacking a deep anteromedial excavation of the nasals; from Hyperoodontinae except Khoikhoicetus in having premaxillary crest that is oriented transversely; from Ziphiinae (here restricted to Ziphius and Izikoziphius) in having shorter nasals, a less elevated vertex, less concave dorsal margin of the ascending process of premaxilla in lateral view, and a premaxillary crest that is transversely directed and forms a longer suture with the lateral margin of the nasal; from the Messapicetus clade (MC) as redefined here (i.e., including Aporotus, Beneziphius, Chimuziphius, Choneziphius, Globicetus, Imocetus, Messapicetus, Notoziphius, Tusciziphius, and Ziphirostrum) in lacking medial contacting and thickening of the premaxillae on the rostrum, and in having a premaxillary crest that is oriented transversely and forms a longer suture with the nasal; from Nazcacetus and Tasmacetus in having a premaxillary foramen that is located far anterior to the antorbital notch, a less concave dorsal margin of the ascending process of premaxilla in lateral view, a lesser transversely constricted exposure of the frontal on the vertex, a nasal that is not dorsally excavated,, and a dorsal margin of the mandible that gradually rises toward the coronoid process; and from Ninoziphius in having a premaxillary crest that is oriented transversely and forms a longer suture with the nasal, a less elevated vertex, and smaller and more numerous alveoli on the mandible. |