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Taxonomy
Mamaziphius reyesi was named by Bianucci et al. (2024). Its type specimen is MUSM 4687, a partial skull (partial cranium lacking most of the rostrum, the zygomatic processes of the squamosal, the occipital condyles and the ear bones), and it is a 3D body fossil. Its type locality is Cerros la Mama y la Hija, which is in a Tortonian marine horizon in the Pisco Formation of Peru. It is the type species of Mamaziphius.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Mamaziphius reyesi Bianucci et al. p. 25 figs. Figs. 3-6 |
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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.
†Mamaziphius reyesi Bianucci et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Bianucci et al. 2024 | Mamaziphius n. gen. belongs to Ziphiidae by having a wide hamular fossa of the pterygoid sinus that extends anteriorly on the palatal surface of the rostrum and a narrow jugular notch combined with an unusually distant hypoglossal foramen that we interpret to be homologous with the deeper, obliquely oriented jugular notch shared by all ziphiids. Furthermore, Mamaziphius n. gen. exhibits a large dorsal infraorbital foramen near the base of the rostrum as observed in many (but not all) ziphiids. Among Ziphiidae, Mamaziphius n. gen. shares with Archaeoziphius, Berardius (including “Berardius” kobayashii Kawatani & Kohno, 2021) and Microberardius (all of which form the clade Berardiinae) a supraoccipital that does not reach the level of the vertex dorsally; an ascending process of the premaxilla that is slightly concave in lateral view; and a moderate vertex elevation. However, Mamaziphius n. gen. differs from the berardiines by lacking two distinctive synapomorphies of this clade: an isolated rounded protuberance, formed by the interparietal or frontals, on the posterior part of the vertex; and a posterior transverse narrowing of the nasals and frontals at the vertex. Moreover, Mamaziphius n. gen. further differs from the extant species of Berardius by having shorter maxillary crests that do not extend on the rostrum and temporal fossae that are more anteroposteriorly elongated. Mamaziphius n. gen. differs from all members of Messapicetiformes (new clade defined below) as the mesorostral groove is not closed by a dorsomedial contact of the premaxillae as well as by the lack of a pachyosteosclerotic development of the premaxillae on the rostrum. Mamaziphius n. gen. differs from most members of Vomeroziphii (new clade defined below) as the mesorostral groove is not filled by the mesorostral ossification of the vomer (though this character is absent or less developed in adult females of extant vomeroziphiids). |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Nowak 1991, Uhen 2004 | |||||