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Cetorhinus
Taxonomy
Cetorhinus was named by de Blainville (1816) [Sepkoski's age data: T Ol-l R Sepkoski's reference number: 1066]. It is extant. Its type is Squalus maximus.
It was assigned to Lamnidae by Woodward (1889); to Alopiidae by Jordan (1963); to Lamniformes by Sepkoski (2002); and to Cetorhinidae by Ciobanu (1977), Schultz (1978), Bendix-Almgreen (1983), Cione and Reguero (1998), Purdy et al. (2001), Compagno (2005), Cicimurri and Knight (2009), Welton (2013), Welton (2014), Welton (2015), Welton (2015) and Kent (2018).
It was assigned to Lamnidae by Woodward (1889); to Alopiidae by Jordan (1963); to Lamniformes by Sepkoski (2002); and to Cetorhinidae by Ciobanu (1977), Schultz (1978), Bendix-Almgreen (1983), Cione and Reguero (1998), Purdy et al. (2001), Compagno (2005), Cicimurri and Knight (2009), Welton (2013), Welton (2014), Welton (2015), Welton (2015) and Kent (2018).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1810 | Tetroras Rafinesque |
| 1816 | Cetorhinus de Blainville |
| 1817 | Selache Cuvier |
| 1863 | Polyprosopus Couch |
| 1871 | Hannovera Van Beneden p. 504 |
| 1876 | Selache (Hannovera) Van Beneden p. 299 |
| 1889 | Cetorhinus Woodward p. 429 |
| 1963 | Cetorhinus Jordan p. 599 |
| 1963 | Hannovera Jordan p. 599 |
| 1963 | Polyprosopus Jordan p. 599 |
| 1963 | Selache Jordan p. 599 |
| 1963 | Tetroras Jordan p. 599 |
| 1977 | Cetorhinus Ciobanu p. 43 |
| 1978 | Cetorhinus Schultz p. 204 |
| 1983 | Cetorhinus Bendix-Almgreen p. 2 |
| 1998 | Cetorhinus Cione and Reguero p. 84 |
| 2001 | Cetorhinus Purdy et al. p. 109 |
| 2002 | Cetorhinus Sepkoski |
| 2005 | Cetorhinus Compagno |
| 2009 | Cetorhinus Cicimurri and Knight p. 631 |
| 2013 | Cetorhinus Welton p. 5 |
| 2014 | Cetorhinus Welton p. 32 |
| 2015 | Cetorhinus Welton p. 8 |
| 2018 | Cetorhinus Kent p. 102 |
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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. Cetorhinus de Blainville 1816
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†Cetorhinus duponti Hasse 1882
†Cetorhinus huddlestoni Welton 2014
Cetorhinus maximus Gunner 1765
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Invalid names: Hannovera aurata Van Beneden 1871 [synonym], Selache duponti Hasse 1882 [synonym]
†Cetorhinus piersoni Welton 2015
Invalid names: Hannovera Van Beneden 1871 [synonym], Polyprosopus Couch 1863 [synonym], Selache Cuvier 1817 [synonym], Tetroras Rafinesque 1810 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. J. Welton 2015 | A genus of Cetorhinidae differing from Keasius Welton, 2013a, by having a nearly homodont dentition; weak gradient monognathic heterodonty in both jaws; weak dignathic heterodonty with largest teeth in the lower jaw; strong ontogenetic heterodonty with erect to nearly horizontal cusps in juvenile individuals, and more erect, narrow to broad cusps in adults of both sexes; sexual dimorphism unknown; dental series on either side of symphysis in upper and lower jaws with 100 or more rows; tooth size largest about the center of the dental band in both jaws, decreasing in size mesially and distally; crown with a single narrow to wide cusp, with straight to weakly concave or convex mesial and distal margins that are continuous with the crown base; cusp apex moderately sharp in juvenile individuals, rounded or acute in adults; cusplets generally absent, but when present are most commonly found in juvenile teeth, less frequently in adult teeth, and usually restricted to one cusplet at the mesial crown foot, or developed on a low blade just above the mesial crown foot; lingual crown face weakly convex and smooth, or finely ornamented with irregular fine to coarse ridges and enameloid folds; labial face moderately to strongly convex, smooth or ornamented with numerous, fine, subparallel longitu- dinal ridges that may develop anywhere on the crown face; lingual crown foot with or without a slight basal ledge; teeth of juvenile individuals have erect to hook-shaped, nearly horizontal cusps relative to the base; cusps almost erect in adults of both sexes; mesial and distal cutting edges in juvenile individuals continuous to near crown foot; cutting edges in adult individuals generally do not reach the crown foot; labial crown foot smooth or with numerous deep, short enameloid folds that are covered with irregular pits and short enameloid ridges in some juvenile teeth; enameloid folds at labial crown foot reduced or absent in adults; root usually weakly convex to strongly rounded lingually in mesial or distal view, with horizontal to strongly convex basal attachment surface; root lobes widely separated and well developed, reduced, or absent; lingual protuberance weakly convex to strongly convex, and reduced in size toward mesial and distal ends of the dental series; apex of cusp extends beyond lingual face of root in mesial or distal view; vertebrae anteroposteriorly long; radial calcifications of intermedialia external to concentric lamellae in precaudal vertebrae, and replace concentric lamellae in some caudal centra, or absent entirely in some vertebrae; radial calcifications reach dorsal, ventral, and lateral margins of centra; concentric lamella walls perforated by numerous radiating calcified tubes; diagonal lamellae absent. |