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Coronodon planifrons
Taxonomy
Coronodon planifrons was named by Boessenecker et al. (2023) [LSID urn:lsid:zoobank.org:act:445DF386-7800-453F- ACA7-3D3EE8143149]. Its type specimen is CCNHM 166, a partial skeleton (rostrum fragments, braincase, left and right periotics, 24 teeth, left mandible, four cervical vertebrae, seven thoracic vertebrae, ten lumbar vertebrae, 11 cau), and it is a 3D body fossil. Its type locality is North Charleston, Chandler Bridge Fm., Bed 2, which is in a Chattian marine sandstone in the Chandler Bridge Formation of South Carolina.
Synonymy list
| Year | Name and author |
|---|---|
| 2023 | Coronodon planifrons Boessenecker et al. p. 92 |
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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.
†Coronodon planifrons Boessenecker et al. 2023
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. W. Boessenecker et al. 2023 | Coronodon planifrons n. sp. is a large toothed mysticete (BZW = 460 mm) differing from Coronodon havensteini and Coronodon newtonorum n. sp. in possessing a horizontal (rather than ventrolaterally sloping) supraorbital process of the frontal (sloping 4, v. 14–15 in C. havensteini and 20–25 in C. newtonorum); possessing a dorsoventrally deep postorbital process that is deeper than the preorbital process (9.5% of postorbital width v. 5% in C. havensteini); possessing a crescentic dorsal extension of the sternomastoid fossa, nearly to the posterior apex of the nuchal crest (fossa in C. havensteini is approximately 1/3 this length); frontals penetrating further posteriorly into the intertemporal region, 13% of postorbital width v. 8% in C. havensteini; zygomatic process dorsoventrally deeper than in C. havensteini, relative to height at vertex of cranium (not possible to evaluate in C. newtonorum n. sp); medially excavated and undercut basioccipital crest that protrudes further ventrally than C. havensteini; longer intertemporal region (distance from anteriormost point of orbitotemporal crest to supraoccipital apex 54% of postorbital width v. 34–36% in C. havensteini); more deeply excavated dorsal condyloid fossae;; lower m3 has six rather than five mesial denticles as in C. havensteini; upper M2 slightly smaller and lower crowned than in C. havensteini; upper M3 dramatically smaller than M2. Coronodon planifrons n.sp. further differs from Coronodon newtonorum n. sp. in possessing a straight ventral margin of the mandible, a mandibular condyle not elevated above the toothrow, and absolutely larger teeth and periotic. Coronodon planifrons further differs from Coronodon havensteini in possessing a larger lateral tuberosity of the periotic, with rectangular outline, and projecting beyond lateral margin of periotic (shared with Coronodon newtonorum n. sp.). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||