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Taxonomy
Tiucetus rosae was named by Marx et al. (2017). Its type specimen is MNHN.F. PPI261, a partial skull (partial cranium preserving most of the braincase, the bases of both supraorbital processes, both periotics and tympanic bullae, both mallei and stapes, and the ), and it is a 3D body fossil. Its type locality is Santa Rosa, which is in a Serravallian/Tortonian marine horizon in the Pisco Formation of Peru. It is the type species of Tiucetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Tiucetus rosae Marx et al. p. 2 figs. Figs. 2-9 |
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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.
†Tiucetus rosae Marx et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. G. Marx et al. 2017 | Small-sized baleen whale differing from all other chaeomysticetes except cetotheriids in having a distally expanded compound posterior process of the tympanoperiotic (hereafter: posterior process) with a well-defined external surface and a partially floored facial sulcus; further differs from eomysticetids, balaenids, Diorocetus, and the cetotheriids Brandtocetus, Cetotherium, Herpetocetus and Piscobalaena in having a squamosal cleft; from eomysticetids in having comparatively short nasals, a more anteriorly projected supraoccipital and parietal, and a tympanic bulla that is rotated so that the inner posterior prominence faces dorsally; from balaenids in having a transversely compressed anterior process of the periotic that is underlapped by the lateral lamina of the pterygoid, and in lacking an arched rostrum; from balaenopterids and eschrichtiids in having a supraorbital process that gradually descends from the skull vertex, a broadly triangular ascending process of the maxilla, and a pars cochlearis that is not cranially elongated; from Isanacetus, Parietobalaena and ‘Diorocetus’ chichibuensis in having a narrow body of the periotic with no sign of lateral inflation, and a more prominent inner posterior prominence of the tympanic bulla that is not medially and anteriorly retracted; from Diorocetus in having the inner posterior prominence of the tympanic bulla developed as a bulbous dorsal projection on the involucrum, and in lacking a ridge posteriorly bordering the facial sulcus on the posterior process; from all cetotheriids and Titanocetus in having a broadly triangular ascending process of the maxilla, a well- developed ascending process of the premaxilla extending posteriorly as far as the maxilla, and a nasal that only moderately tapers posteriorly; and from all cetotheriids except Cephalotropis and Joumocetus in having parietals that are well exposed on the skull vertex.
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Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Serravallian to the top of the Tortonian or 13.82000 to 7.24600 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Serravallian - Tortonian | Peru | Tiucetus rosae (type locality: 188740) |