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Macrosqualodelphis
Taxonomy
Macrosqualodelphis was named by Bianucci et al. (2018). Its type is Macrosqualodelphis ukupachai.
It was assigned to Squalodelphinidae by Bianucci et al. (2018).
It was assigned to Squalodelphinidae by Bianucci et al. (2018).
Species
M. ukupachai (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Macrosqualodelphis Bianucci et al. p. 4 figs. Figures 2–11, tables 1 and 2 |
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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. †Macrosqualodelphis Bianucci et al. 2018
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†Macrosqualodelphis ukupachai Bianucci et al. 2018
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Bianucci et al. 2018 | Macrosqualodelphis differs from all the other squalodelphinids in: larger size (as seen in BZW and CBL, see below); less abrupt anterior tapering of rostrum in dorsal view (see quantification below); U-shaped left antorbital notch; prominent nuchal crest, higher than the frontals and nasals at the vertex; thinner, blade-like lateral margin of the posterior portion of the rostrum; more voluminous temporal fossa and larger teeth (see quantification below). It further differs from Huaridelphis, Notocetus and Squalodelphis in the right and left frontals displaying roughly the same longitudinal length at the vertex. It further differs from Huaridelphis in medial and lateral borders of the right antorbital notch drawing a more open angle (see quantification below); thicker antorbital process of the frontal, distinctly thicker than the antorbital process of the maxilla in lateral view; more elongated postorbital process of the frontal; nasal dorsally inflated; vertex not anteroventrally sloping; vertex more transversely constricted posterior to the nasals (see quantification below); left maxilla descending more abruptly lateroventrally from the vertex, forming a deeper fossa posterolateral to the left nasal; anteroposteriorly longer zygomatic process of the squamosal and probably lower upper tooth count. It further differs from Notocetus in smaller nasal and probably lower upper tooth count. It further differs from Medocinia and Squalodelphis in: dorsal opening of the mesorostral groove being narrower than the premaxilla at the base of the rostrum and wider dorsal exposure of the maxilla at the base of the rostrum (the premaxilla nearly reaches the lateral margin of the rostrum in Medocinia and Squalodelphis). It further differs from Squalodelphis in the transversely wider nuchal crest (crest approximately as wide as the greatest width of the premaxillae in Squalodelphis and considerably wider in Macrosqualodelphis). |