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Kaaucetus thesaurus
Taxonomy
Kaaucetus thesaurus was named by Hernández-Cisneros (2022). Its type specimen is MHN-UABCS_EcSj1/29/141, a partial skull, and it is a 3D body fossil. Its type locality is Mesa Tesoro, which is in a Chattian lagoonal mudstone in the El Cien Formation of Mexico. It is the type species of Kaaucetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Kaaucetus thesaurus Hernández-Cisneros p. 3 figs. Figs 2-8 |
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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.
†Kaaucetus thesaurus Hernández-Cisneros 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. E. Hernández-Cisneros 2022 | Kaaucetus thesaurus gen. et sp. nov., specimen MU_EcSj1/29/141, is differentiated from other known aetiocetids by having: pronounced squamosal prominence like a fingertip, zygomatic process as a continuous arch with a tapering end, and very narrow and converging posterior nasals. Kaaucetus thesaurus gen. et
sp. nov. is classified as an aetiocetid whale (Barnes etal.1995; Deméré & Berta 2008; Marx et al.2 016; Peredo & Pyenson 2018) by having: small body size (bizygomatic width ~320mm), slender zygomatic process of the squamosal, stepped premaxilla at the level of the nasal opening and laterally overhanging the maxilla, elongated lacrimal incising into the ascending process of the maxilla, the supraorbital process of frontal elevated at the same level as cranial vertex, large orbit, a post- orbital ridge of the frontal absent, and anterior end of the nasals just anterior of the anterior edge of the supraorbital process (the nasal length is 55.4% of the bizygomatic width). Kaaucetus thesaurus gen. et sp. nov. differs from Mammalodontidae by having a longer rostrum with the rostral proportion index (RPI; Boessenecker et al. 2017) higher (1.32 RPI) than those in Janjucetus (0.86 RPI) or Mammalodon (0.89 RPI); from Llanocetidae and Coronodon from lacking relative long body size; and from Chaeomysticeti by having a slender zygomatic process. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||