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Emarginachelys
Taxonomy
Emarginachelys was named by Whetstone (1978). Its type is Emarginachelys cretacea.
It was corrected as Emarginochelys by Bryant (1989); it was misspelled as Emarginochelys by Holroyd and Hutchison (2002), Danilov and Parham (2008), Knauss et al. (2011) and Joyce and Bourque (2016).
It was assigned to Durocryptodira by Danilov and Parham (2008); to Chelydridae by Whetstone (1978), Carroll (1988), Bryant (1989), Holroyd and Hutchison (2002) and Knauss et al. (2011); and to Pankinosternoidea by Joyce and Bourque (2016).
It was corrected as Emarginochelys by Bryant (1989); it was misspelled as Emarginochelys by Holroyd and Hutchison (2002), Danilov and Parham (2008), Knauss et al. (2011) and Joyce and Bourque (2016).
It was assigned to Durocryptodira by Danilov and Parham (2008); to Chelydridae by Whetstone (1978), Carroll (1988), Bryant (1989), Holroyd and Hutchison (2002) and Knauss et al. (2011); and to Pankinosternoidea by Joyce and Bourque (2016).
Species
E. cretacea (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Emarginachelys Whetstone p. 544 figs. 5-19 |
| 1988 | Emarginachelys Carroll |
| 1989 | Emarginochelys Bryant p. 37 |
| 2002 | Emarginochelys Holroyd and Hutchison |
| 2008 | Emarginachelys Danilov and Parham |
| 2011 | Emarginachelys Knauss et al. |
| 2016 | Emarginachelys Joyce and Bourque |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. N. Whetstone 1978 | Cryptodiran turtle with processus trochlearis oticum and pterygoid brace to the braincase; foramen stapedio-temporale not reduced; nasal bones absent; prefrontals downturned anteriorly; frontals bordering the orbits; the skull roof narrowed above the orbits; otic bridge broad; supraoccipital crest long and low; jugal and postorbital bones elongate; premaxillary "hook" absent; quadrate open behind the stapes; cheek region with some lateral emargination; foramen posterior canalis carotici interni not bordered by basisphenoid; foramen carotico-pharyngeale not enlarged; fossa for attachment of the pterygoideus musculature not extending far anteriorly; triturating surface of maxilla narrow, with a prominent secondary ridge; pterygoid "waist" neither broad, as in Chelydra, nor greatly constricted, as in Macroclemys temmincl{ii; vomer contacting palatines posteriorly; foramen nervi trigemini and foramen cavernosum small, situated anterior to the dorsum sellae; prootic contacting processus clinoideus laterally; epipterygoid (?) absent; dorsum sellae low, overhanging the sellae turcica; neither foramen caroticum laterale nor foramen anterior canalis carotici interni enlarged; one biconvex cervical vertebra; costal bones not meeting behind the neurals; no serration of the carapace posteriorly; supramarginal scutes absent; carapace weakly keeled medially, costals with parallel ridges; peripherals unsculptured; no carapacial fontanelles; nuchal bone with long, costiform processes; plastron cruciform, ligamentously attached to the carapace; entoplastron reduced, but not "T" shaped; right and left sides of plastron in contact, but not sutured together; thecal process on the ilium; pectineal processes of the pubis not laterally expanded; pubis and ischium separated medially. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Uetz 2005 | |||||
Age range: Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lancian | USA (Wyoming) | Emarginochelys sp. (14519) | |
| Lancian | USA (Montana) | Emarginochelys cretacea (14616) Emarginochelys sp. (14512 14568) | |
| Lancian | USA (North Dakota) | Emarginochelys cretacea (137715) | |
| Late/Upper Maastrichtian | USA (Montana) | E. cretacea (131973) | |
| Late/Upper Maastrichtian | USA (North Dakota) | Emarginochelys cretacea (137718) |