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Fucaia
Taxonomy
Fucaia was named by Marx et al. (2015).
It was assigned to Aetiocetidae by Marx et al. (2015), Fordyce and Marx (2016), Marx et al. (2016), Tsai and Kohno (2017), Berta (2017), Fordyce and Marx (2018), Hernández Cisneros and Velez-Juarbe (2024), Tsai et al. (2024).
It was assigned to Aetiocetidae by Marx et al. (2015), Fordyce and Marx (2016), Marx et al. (2016), Tsai and Kohno (2017), Berta (2017), Fordyce and Marx (2018), Hernández Cisneros and Velez-Juarbe (2024), Tsai et al. (2024).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Fucaia Marx et al. p. 3 |
| 2016 | Fucaia Fordyce and Marx p. 114 figs. Fig. 4 |
| 2016 | Fucaia Marx et al. p. 105 |
| 2017 | Fucaia Berta p. 166 |
| 2017 | Fucaia Tsai and Kohno |
| 2018 | Fucaia Fordyce and Marx p. 5 figs. Fig. 4 |
| 2024 | Fucaia Hernández Cisneros and Velez-Juarbe p. 3 |
| 2024 | Fucaia Tsai 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.
G. †Fucaia Marx et al. 2015
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†Fucaia buelli Marx et al. 2015
†Fucaia goedertorum Barnes et al. 1995
†Fucaia humilis Tsai et al. 2024
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. E. Hernández Cisneros and J. Velez-Juarbe 2024 | Fucaia is distinguished by the following combination of characters: small body size (∼1.8 m length); dorsally flattened braincase (in lateral view); exposed ‘interparietal bone’; dorsal surface of the skull flattened to slightly convex with parasagittal crests and without parasagittal clefts over the posterior half of the intertemporal region; V-shape fronto-parietal suture; broad frontal with a supraorbital process nearly equal in length and width (distances from the postorbital process tip to
the anterior edge of the supraorbital process, and from the postorbital process tip to the sagittal line of the skull); thin postorbital process (nearly bulbous shaped, in lateral view); elongated lacrimal with a near elliptical outline; and heterodont dentition. Fucaia is distinct from Chonecetus by lacking: transversally broad supraoccipital; parasagittal cleft; slender, cylindrical, and short posterior process. From Kaaucetus by lacking: pronounced squamosal prominence; zygomatic process as a continuous arch with a tapering end; and very narrow and converging posterior nasal end. From Aetiocetus by lacking: anteroposteriorly narrow frontal; large and prominent postorbital process; thick apex of the postorbital process; deeply concave orbital rim (in dorsal view); long and narrow lacrimal protruding laterally in the preorbital region; broad intertemporal region; smaller and weak heterodont dentition (incipient homodonty); posterior edge of the nasal bones over the posterior half of the frontal (except in Aetiocetus cotylalveus). From Morawanocetus by lacking: short intertemporal region; frontal wider than long; postorbital process long and dorsoventrally slender; transversally expanded zygomatic process with the tapered end (acute tip); glenoid fossa with a rectangular profile. From Salishicetus by lacking: ≥ 14 teeth set in the lower jaw; blunt mandibular terminus (lateral view); nine mental foramina; periotic bone without pyramidal process and slender and cylindrical posterior process. From Borealodon by lacking: postorbital process in an angle near 90° with respect to the sagittal plane; periotic bone with the anterior process with an irregular keel. From Willungacetus aldigensis Pledge, 2005 (incertae sedis; Fitzgerald, 2010) by lacking: broad supraoccipital; nuchal crest projected anteriorly; and broad intertemporal region. From ‘Ashorocetus’ (nomen dubium; Fitzgerald, 2010) by lacking: anterior inclined nuchal crest and transversally thickened basioccipital crest with a square-rectangular profile. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Priabonian to the top of the Chattian or 37.71000 to 23.04000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Priabonian | USA (Washington) | F. humilis (205032) | |
| Rupelian | USA (Washington) | F. buelli (120368) | |
| Chattian | USA (Washington) | Chonecetus goedertorum (45784) |