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Squaloziphiidae
Taxonomy
Squaloziphiinae was named by Muizon (1990). It is not extant. Its type is Squaloziphius.
It was reranked as the family Squaloziphiidae by Lambert et al. (2019), Boessenecker and Geisler (2023), Gaetán et al. (2023).
It was assigned to Ziphiidae by Muizon (1990), Fordyce and de Muizon (2001), Bianucci and Landini (2007), Foekens (2008); to Odontoceti by Lambert et al. (2019); to Stegoceti by Boessenecker and Geisler (2023); and to Odontoceti by Gaetán et al. (2023).
It was reranked as the family Squaloziphiidae by Lambert et al. (2019), Boessenecker and Geisler (2023), Gaetán et al. (2023).
It was assigned to Ziphiidae by Muizon (1990), Fordyce and de Muizon (2001), Bianucci and Landini (2007), Foekens (2008); to Odontoceti by Lambert et al. (2019); to Stegoceti by Boessenecker and Geisler (2023); and to Odontoceti by Gaetán et al. (2023).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Squaloziphiinae Muizon p. 282 |
| 2001 | Squaloziphiinae Fordyce and de Muizon p. 179 |
| 2007 | Squaloziphiinae Bianucci and Landini p. 45 figs. Table 2.1 |
| 2008 | Squaloziphiinae Foekens p. 7 figs. Table 1 |
| 2019 | Squaloziphiidae Lambert et al. |
| 2023 | Squaloziphiidae Boessenecker and Geisler p. 152 |
| 2023 | Squaloziphiidae Gaetán et al. p. 2 |
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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.
Fm. †Squaloziphiidae Muizon 1990
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Lambert et al. 2019 | Members of family Squaloziphiidae differ from
other odontocetes, including archaic homodont species (e.g., ‘Argyrocetus’ bakersfieldensis, ‘Argyrocetus’ joaquinensis, Chilca- cetus cavirhinus, Macrodelphinus kelloggi, and Papahu taitapu) in sharing the following unique combination of characters: trans- versely wide dorsal opening of mesorostral groove at base of rostrum, followed posteriorly by abrupt narrowing toward anterior margin of bony nares (synapomorphy); premaxillary foramen posterior to level of antorbital notch; lateral margin of premaxilla making a straight line from base of rostrum to pos- terior end of premaxillary sac fossa; thickened lateral margin of maxilla in antorbital region making a long and laterally concave crest; massive postglenoid process of squamosal, being longer ventrally than posttympanic process and exoccipital; apex of post- glenoid process anteroposteriorly longer than transversely thick (synapomorphy); and prominent anterodorsal angle of periotic laterally shifted compared with anterior tip of anterior process (unknown in Squaloziphius emlongi). Although Squaloziphiidae share several derived characters with Ziphiidae (presence of transverse premaxillary crests on vertex, also present in several eurhinodelphinids and delphinidans, and transversely wide ptery- goid sinus fossa), they further differ from the latter in pterygoid sinus fossa anteriorly not reaching the level of antorbital notch and ventrally distant from ventral-most level of basicranium; aperture for endolymphatic duct being dorsolateral to dorsal margin of spiral cribriform tract (unknown in S. emlongi); tuber- cule of malleus being less reduced (unknown in S. emlongi); and lacking a pair of enlarged alveoli for mandibular tusks (unknown in S. emlongi). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: base of the Aquitanian to the top of the Burdigalian or 23.04000 to 15.98000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chattian - Burdigalian | USA (Oregon) | Yaquinacetus meadi (200274) | |
| Aquitanian | USA (Washington) | Squaloziphius emlongi (45481) | |
| Burdigalian | Argentina (Chubut) | Crisocetus lydekkeri (203129) |