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Llanocetus denticrenatus
Taxonomy
Llanocetus denticrenatus was named by Mitchell (1989). Its type specimen is USNM 183022, a partial skull, and it is a 3D body fossil. Its type locality is La Meseta Seymour Island, Unit III, which is in a Priabonian lagoonal sandstone in the La Meseta Formation of Antarctica. It is the type species of Llanocetus.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Llanocetus denticrenatus Mitchell |
| 1996 | Llanocetus denticrenatus Cozzuol p. 324 |
| 2010 | Llanocetus denticrenatus Fitzgerald p. 370 figs. Table 1 |
| 2015 | Llanocetus denticrenatus Marx and Fordyce p. 4 figs. Figure 2 |
| 2016 | Llanocetus denticrenatus Fordyce and Marx p. 114 figs. Fig. 4 |
| 2017 | Llanocetus denticrenatus Tsai and Kohno figs. Table 1 |
| 2018 | Llanocetus denticrenatus Fordyce and Marx p. 1 |
| 2019 | Llanocetus denticrenatus Buono et al. |
| 2019 | Llanocetus denticrenatus Marx et al. p. 99 |
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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.
†Llanocetus denticrenatus Mitchell 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. E. Fordyce and F. G. Marx 2018 | Differs from all known cetaceans in having markedly palmate- denticulate, widely spaced teeth, and a robust mandibular crest (new term) immediately lateral to the lower tooth row. Differs from archaeocetes, Mystacodon, and mammalodontids in hav- ing a supraoccipital that projects anteriorly well beyond the ante- rior border of the squamosal fossa. Shares with mysticetes, but not archaeocetes or odontocetes, the presence of a dorsoven- trally flattened and laterally expanded maxilla and of a trans- versely thickened basioccipital crest. Differs from all known mysticetes in having palatal sulci that converge on the alveoli. Further differs from all mysticetes except Mystacodon in having a sagittal trough on the parietals; from all mysticetes except mammalodontids, Mystacodon, and Morawanocetus in having teeth with strong enamel ornament both lingually and labially; from all mysticetes except Mystacodon and eomysticetids in having extremely elongate nasals; from all chaeomysticetes in retaining a functional dentition and unfused basi- and thyrohyals; and from Mystacodon, mammalodontids, and aetiocetids in its larger size and in having a lateral lamina of the pterygoid that underlies the anterior process of the periotic.
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| F. G. Marx et al. 2019 | Large-sized llanocetid sharing with other members of the family the presence of elongated nasals, low, elongate premolar crowns bearing strong labial and lingual enamel ornaments, and a broad sagittal trough on the parietals lacking a distinct sagittal crest. Differs from Mystacodon in its larger size, and from OU GS10897 in having apically curved accessory denticles and an abruptly depressed anterior entocingulum on the upper premolars. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: Priabonian or 38.00000 to 33.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Priabonian | Antarctica (Seymour Island) | Llanocetus denticrenatus (100290) | |
| Priabonian | Antarctica | Zeuglodon sp. (type locality: 45723) |