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Ninjadelphis
Taxonomy
Ninjadelphis was named by Kimura and Barnes (2016). Its type is Ninjadelphis ujiharai.
It was assigned to Allodelphinidae by Kimura and Barnes (2016), Godfrey et al. (2017) and Berta (2017).
It was assigned to Allodelphinidae by Kimura and Barnes (2016), Godfrey et al. (2017) and Berta (2017).
Species
N. ujiharai (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Ninjadelphis Kimura and Barnes p. 20 |
| 2017 | Ninjadelphis Berta p. 163 |
| 2017 | Ninjadelphis 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. †Ninjadelphis Kimura and Barnes 2016
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†Ninjadelphis ujiharai Kimura and Barnes 2016
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Kimura and L. G. Barnes 2016 | A genus of Allodelphinidae differing from Allodelphis, Goedertius and Zarhinocetus by having cranium with trapezoidal shaped exposure of frontals on cranial vertex, postglenoid process of squamosal enlarged at posterolateral corner of glenoid fossa, glenoid fossa for articulation with mandibular condyle facing anteromedially rather than anteroventrally, nuchal crest partly overhanging posterior end of maxilla, basioccipital wider, basioccipital crests widely diverging posteriorly, paroccipital process enlarged; differing further from Allodelphis and Zarhinocetus by having petrosal with smaller cochlear portion, longer anterior process, longer and transversely compressed posterior process, articular facet for tympanic bulla on posterior process divided into two articular surfaces, forming ventral and posteromedial surfaces; differing further from Allodelphis by having cranium with cranial vertex asymmetrical and skewed slightly to left side, medial margins of premaxillae closer together over mesorostral canal anterior to dorsal nares, premaxillary foramen recessed in sulcus on dorsal surface of premaxilla, medial part of dorsal surface of posterior part of rostrum depressed, posterior ends of premaxillae retracted anteriorly to location opposite centers of dorsal nares, area where posterior end of premaxilla formerly existed, forming premaxillary sac fossa, formed of smooth, convex, and dense maxillary bone, and right and left nasal bones fused together at midline and fused to the underlying and adjacent mesethmoid and frontal bones; petrosal with articular facet for tympanic bulla smoother, lacking furrows; tympanic bulla with more inflated outer lip, longer posterior process, and larger and more laterally directed sigmoid process; and atlas vertebra with dorsal transverse process more expanded dorsoventrally, and ventral transverse process longer; differing further from Goedertius by having posterior end of premaxilla anteriorly retracted rather than extending posteriorly to posterior ends of nasal bones, deeper depression anterior to nares, larger dorsal exposure of frontals at cranial vertex, larger temporal fossa, longer zygomatic process of squamosal, mesethmoid septum between posterior parts of nares extending farther dorsally, posterior maxillary foramen positioned more posteriorly, occipital condyles less protruding posteriorly; and differing further from Zarhinocetus by having cranium with posterior end of premaxilla extending to position opposite centers of dorsal nares rather than terminating farther anterior at point anterolateral to dorsal nares, facial region narrower and not projecting as far laterally over temporal fossa, temporal fossa more anteroposteriorly elongated, occipital shield not so high dorsoventrally, occipital condyles smaller, and by lacking swollen tubercle of bone on lateral part of rostral maxilla anterior to antorbital notch; petrosal less robust, with longer and more slender anterior process, longer and more tapered posterior process; tympanic bulla with less inflated outer lip; and atlas vertebra relatively smaller and less robust, with dorsal transverse process smaller and less expanded dorsoventrally, and ventral transverse process more slender but longer. |