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Cochimicetus
Taxonomy
Cochimicetus was named by Cedillo-Avila et al. (2025). Its type is Cochimicetus convexus.
It was assigned to Eomysticetidae by Cedillo-Avila et al. (2025).
It was assigned to Eomysticetidae by Cedillo-Avila et al. (2025).
Species
C. convexus (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Cochimicetus Cedillo-Avila et al. |
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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. †Cochimicetus Cedillo-Avila et al. 2025
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†Cochimicetus convexus Cedillo-Avila et al. 2025
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Cedillo-Avila et al. 2025 | Cochimicetus convexus is classified as a Neoceti based on several derived characteristics: a partially open mesorostral groove; an anteroposteriorly elongated rostral portion of the maxilla; the presence of an anteorbital process of the maxilla; an anterodorsally inclined supraoccipital shield; and a narrow intertemporal region. It is further identified as a Mysticeti due to specific features, including the dorsoventrally thin posterolateral region of the maxilla on the rostrum; the apex of the zygomatic process of the squamosal closely opposed to the postorbital process of the frontal; and an external occipital crest restricted to the anterodorsal half of the supraoccipital shield. Cochimicetus convexus and eomysticetids differ from toothed mysticetes in their lack of large emergent teeth during adulthood, as well as in having a significantly elongated rostrum and a kinetic maxilla. Additionally, C. convexus differs from Maibalaena nesbittae in lacking frontal-parietal sutures that converge posteriorly, with the frontals penetrating between the parietals. The posterior border of the nasal is not aligned with the preorbital level. Furthermore, it diverges in the apex of its occipital shield, which represents the highest point of the skull, and in the triangular coronoid process of the mandible, which is anteroposteriorly longer than it is dorsoventrally tall. Cochimicetus convexus also differs from Sitsqwayk cornishorum in several ways: it does not have a dorsal surface of the nasals that forms a sagittal keel; it lacks an external occipital crest preserved as a blunt ridge that divides the anterior half of the occipital shield into two dorsolaterally sloping facets; there is no tympanic bulla in the lateral lobe extending posteriorly to the medial lobe, with the two areas separated by a notch; and it possesses a mandibular condyle and neck that are medially curved, giving the mandible a sinusoidal profile in dorsal view. Cochimicetus convexus is identified as a basally branching Eomysticetidae based on the following characteristics: the absence of a postorbital ridge; lack of a supramastoid crest along the entire zygomatic process of the squamosal; a zygomatic process of the squamosal with parallel medial and lateral margins; the development of secondary squamosal fossa; elongated nasals; the inclusion of a frontal with anteromedial projection; and an anteroposteriorly long and transversely narrow intertemporal region with an oval temporal fossa (longer anteroposteriorly than transversely wide). Cochimicetus convexus differs from all Eomysticetidae in the following combination of attributes: the tympanic bulla anterior tip is round in the dorsal or medial view and diverges from the pointed shape in other eomysticetids; it has a pronounced parietal squamosal suture; in the tympanic bulla, the orientation of the lateral furrow is anteroventrally orientated; the tympanic bulla position of the main ridge in the ventral view is the medial and lateral sides of the bulla; in the maxilla, nutrient foramina, and sulci are absent; the medial contact of the premaxilla along 2/3 of the rostrum is mostly separated from the rostrum and is medially fused from the anterior tip; the anteorbital notch is absent; and the external occipital ridge is absent. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||