Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ctenochelyidae
The existence of this taxon has been hypothesized for more than 20 years (Hirayama, 1997) and is supported by phylogenetic evidence in the present study and in other cladistic studies of marine turtles incorporating multiple species of Late Cretaceous pan-cheloniid (Gentry et al., 2018). I propose the formal naming of this group as Ctenochelyidae after the stratigraphically oldest member of the group, C. stenoporus.
It was assigned to Pancheloniidae by Gentry (2018).
Year | Name and author |
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2018 | Ctenochelyidae Gentry |
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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.
Reference | Diagnosis | |
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A. D. Gentry 2018 | Members of Ctenochelyidae can be diagnosed relative to other turtles by the following combination of derived characters: the presence of an incipient secondary palate involving minor contributions from the palatine and vomer (ch. 40/1), a domed contribution of the anteroventral portion of the vomer to the palate roof (ch. 49/1), the presence of a rod-like rostrum basisphenoidale (ch. 86/1), posteromedial nuchal fontanelles (ch. 123/1), epineural ossifications (ch. 127/1), a high degree of shell and plastral fenestration (ch. 133/3), and a pronounced metischial process (ch. 234/1). |
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Source: subo = suborder, c = class, subp = subphylum | |||||
References: Uetz 2005, Carroll 1988, Hendy et al. 2009 |
Age range
Minimum age of oldest fossil (stem group age): 83.6 Ma
Collections (13 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Turonian - Santonian | USA (Kansas) | Toxochelys bauri (38721) | |
Late/Upper Coniacian - Early/Lower Santonian | USA (Kansas) | Ctenochelys stenoporus (123574) | |
Late/Upper Santonian - Early/Lower Campanian | Germany (Schleswig-Holstein) | Ctenochelys stenoporus (138296) | |
Late/Upper Santonian - Early/Lower Campanian | USA (Alabama) | Ctenochelys tenuitesta (81972) Ctenochelys tenuitesta, Ctenochelys acris (81927) | |
Early/Lower Campanian | USA (Alabama) | Ctenochelys acris (181623 181624) | |
Early/Lower Campanian - Middle Campanian | USA (Alabama) | Ctenochelys acris (80890) | |
Late/Upper Campanian | USA (Mississippi) | Asmodochelys parhami (207339) | |
Late/Upper Campanian | USA (Alabama) | Asmodochelys parhami (207057 207338) | |
Late/Upper Maastrichtian | Netherlands (Limburg) | Ctenochelys sp. (142084) | |
Selandian | Denmark (Fyn) | Ctenochelys stenoporus (196766) |