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Tohoraata
Taxonomy
Tohoraata was named by Boessenecker and Fordyce (2015).
It was assigned to Eomysticetidae by Boessenecker and Fordyce (2015), Boessenecker and Fordyce (2015), Marx et al. (2016), Boessenecker and Fordyce (2017), Tsai and Kohno (2017) and Berta (2017); and to Aetiocetidae by Fordyce and Marx (2018).
It was assigned to Eomysticetidae by Boessenecker and Fordyce (2015), Boessenecker and Fordyce (2015), Marx et al. (2016), Boessenecker and Fordyce (2017), Tsai and Kohno (2017) and Berta (2017); and to Aetiocetidae by Fordyce and Marx (2018).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Tohoraata Boessenecker and Fordyce |
| 2016 | Tohoraata Marx et al. p. 107 |
| 2017 | Tohoraata Berta p. 167 |
| 2017 | Tohoraata Boessenecker and Fordyce |
| 2017 | Tohoraata Tsai and Kohno |
| 2018 | Tohoraata Fordyce and Marx p. 5 figs. Fig. 4 |
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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.
G. †Tohoraata Boessenecker and Fordyce 2015
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†Tohoraata raekohao Boessenecker and Fordyce 2015
†Tohoraata waitakiensis Marples 1956
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. W. Boessenecker and R. E. Fordyce 2015 | Tohoraata raekohao is a relatively small-bodied mysticete (5 m estimated body length) with archaic fea- tures differing from crown Mysticeti including anteropos- teriorly thickened paroccipital process, narrower exposure of the squamosal lateral to the exoccipital in posterior view, temporal fossa longer anteroposteriorly than wide transversely, an unfused anterior pedicle of the tympano- periotic, vertically directed falciform process of the squa- mosal, short posterior process of the periotic, deep lateral pit on base of anterior process, unfused posterior pro- cesses of the periotic and tympanic bulla, well-differenti- ated medial and lateral lobes of the tympanic bulla, horizontal crest present on posterior surface of medial lobe, tympanic cavity divided by transverse ridge, well- developed horizontal cleft of sigmoid fissure, prominently
incised elliptical foramen and separated inner and outer posterior pedicles, a distinct glenoid fossa, and delicate angular process of the mandible. Tohoraata raekohao differs from toothed mysticetes and archaeocetes in possessing an orbitotemporal crest that is positioned entirely on the dorsal surface of the frontal, and subrect- angular supraorbital process that is wider than anteropos- teriorly long and at the same level as the nasals; from Basilosauridae in possessing an anteroposteriorly narrow and transversely elongate supraorbital process of the fron- tal, vertical nuchal crests that do not dorsally overhang the posterior margin of the skull, transversely thickened basioccipital crests, a rounded anteromedial corner of the pars cochlearis, pars cochlearis lacking longitudinal ventral ridge, mallear fossa positioned medial to lateral tuberosity, superior process of the periotic reduced to low ridge with anterior and posterior triangular apices, and posterior process of the periotic that does not extend to the lateral margin of the braincase; from Mammalodontidae and Chonecetus in exhibiting a transverse frontoparietal suture; from other Eomysticetidae in exhibiting numerous foram- ina on the dorsal surface of the frontal, anterolaterally directed exoccipital, a flat junction of the occipital shield and interorbital region (<10 degree angle), anterodorsal angle of the periotic positioned in posterior part of ante- rior process, flat posterior bullar facet lacking numerous longitudinal ridges, and posterior and dorsal margins of periotic body forming posterodorsal corner in medial or lateral view under 90 degrees; from all other Mysticeti in exhibiting a dorsoventrally flattened supraorbital process of the frontal lacking an obvious trough-like optic canal and an oval-shaped flange of bone closely appressed to the anterolateral margin of the pars cochlearis; from all other Cetacea in possessing a hook-like secondary tuber- osity on the lateral side of the anterior process of the peri- otic that forms an anteroposteriorly narrow notch for the transverse sulcus with the lateral tuberosity. Tohoraata raekohao shares with Aetiocetidae and Eo- mysticetidae an extensive anterior meatal crest that extends dorsally along 75% of the dorsoventral depth of the squamosal posterior to the postglenoid process. Tohoraata raekohao shares with other Eomysticetidae numerous aforementioned archaic features and, to the exclusion of all other Mysticeti, an inflated and tubular zygomatic pro- cess lacking a supramastoid crest, a secondary squamosal fossa, and superior process of periotic reduced to a low ridge with anterior and posterior apices. Tohoraata raeko- hao shares with Eomysticetidae and Cetotheriidae sensu stricto a transversely flattened and blade-like anterior pro- cess and an aperture for the cochlear aqueduct aligned with the spiral cribriform tract and foramen singulare. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: Duntroonian or 27.30000 to 25.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Duntroonian | New Zealand (North Otago) | Mauicetus waitakiensis (45660 63049) | |
| Duntroonian | New Zealand | T. raekohao (163849) |