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Echericetus novellus
Taxonomy
Echericetus novellus was named by Hernández-Cisneros et al. (2024). Its type specimen is MRAHBCS Pal/V119, a partial skeleton, and it is a 3D body fossil. Its type locality is Rancho La Palma, which is in an Oligocene/Miocene marine horizon in Mexico. It is the type species of Echericetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Echericetus novellus Hernández-Cisneros 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.
†Echericetus novellus Hernández-Cisneros et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. E. Hernández-Cisneros et al. 2024 | Echericetus novellus n. gen. n. sp. displays the combination of eomysticetid diagnostic features (Sanders and Barnes, 2002a, b; Boessenecker and Fordyce, 2015a): the elongate intertemporal region; large and oval temporal fossa; occipital shield relatively posterior to the postorbital process of frontal; broad and high coronoid process; transversely compressed blade-like anterior process of the periotic. Further, Echericetus novellus differs from known eomysticetids in having dorsoventrally thickened orbital rim with rounded surface; reduced and inconspicuous postorbital process; preorbital process thicker than the postorbital process; wide and long intertemporal region; supraoccipital with anteroposteriorly convex surface; elongated and elliptical pterygoid sinus fossa; squared-like basioccipital crest; rectangular anterior process of the periotic in medial view; S-shaped mandible in lateral view and the axis vertebra with bilobed hypapophysis. Echericetus novellus also differs from Sitsqwayk cornishorum Peredo and Uhen, 2016 and Maiabalaena nesbittae Peredo et al., 2018 in lack of a prominent postorbital process, relatively thin orbital rim, concave dorsal surface of the supraoccipital, and straight nuchal crest; it differs from Mauicetus parki (Benham, 1937), Horopeta umarere Tsai and Fordyce, 2015b, Whakakai waipata Tsai and Fordyce, 2016, Tlaxcallicetus, and Toipahautea waitaki Tsai and Fordyce, 2018 in the lack of a massive body of the periotic; transversally thick or very thin, dorsally prominent anterior process. Echericetus novellus differs from the crown Mysticeti (Balaenidae, Balaenopteridae, Cetotheriidae, Eschrichtiidae) in having archaic features, such as a poorly telescoped skull, prominent plate-like coronoid process, the presence of the fovea epitubaria, and the acoustic meatus as a single aperture. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Late/Upper Oligocene to the top of the Early/Lower Miocene or 27.30000 to 15.98000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oligocene - Early/Lower Miocene | Mexico (Baja California Sur) | Cetotheriidae indet. (type locality: 159695) |