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Taxonomy
Stygiochelys was named by Gaffney and Hiatt (1971). Its type is Stygiochelys estesi.
It was assigned to Baeninae by Holroyd and Hutchison (2002); to Eubaenina by Hutchison and Holroyd (2003); to Baenodda by Lyson and Joyce (2010); to Baenidae by Gaffney and Hiatt (1971), Carroll (1988), Bryant (1989) and Lyson and Joyce (2011); to Eubaeninae by Joyce and Lyson (2015); and to Eubaeninae by Gaffney (1972) and Lyson et al. (2016).
It was assigned to Baeninae by Holroyd and Hutchison (2002); to Eubaenina by Hutchison and Holroyd (2003); to Baenodda by Lyson and Joyce (2010); to Baenidae by Gaffney and Hiatt (1971), Carroll (1988), Bryant (1989) and Lyson and Joyce (2011); to Eubaeninae by Joyce and Lyson (2015); and to Eubaeninae by Gaffney (1972) and Lyson et al. (2016).
Species
S. estesi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1971 | Stygiochelys Gaffney and Hiatt p. 2 |
| 1972 | Stygiochelys Gaffney pp. 248, 266-269 fig. 20,21,58 |
| 1988 | Stygichelys Carroll |
| 1989 | Stygiochelys Bryant p. 36 |
| 2002 | Stygiochelys Holroyd and Hutchison p. 181 |
| 2003 | Stygiochelys Hutchison and Holroyd |
| 2010 | Stygiochelys Lyson and Joyce |
| 2011 | Stygiochelys Lyson and Joyce p. 792 |
| 2015 | Stygiochelys Joyce and Lyson |
| 2016 | Stygiochelys Lyson 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. †Stygiochelys Gaffney and Hiatt 1971
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†Stygiochelys estesi Gaffney and Hiatt 1971
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. S. Gaffney and R. Hiatt 1971 | Skull wedge-shaped, width equal to length; temporal emargination deep; nasals not expanded laterally; prefrontals with small dorsal lappet; no squamosal parietal contact; parietal larger than frontal; frontoparietal suture tends to be curved, concave posteriorly; quadratojugal C-shaped with dorsal process but without anterior expansion; orbits opening laterally; triturating surface smoothly convex without a high tomial ridge, as in Eubaena, but incipient secondary palate absent; cheek emargination not reaching lower level of orbit; maxillae laterally constricted; skull roof terminating in point over crista supraoccipitalis; jugal entering orbital margin. | |
| E. S. Gaffney 1972 | Eubaenine with Eubaena-like triturating surface, smoothly convex, no high tomial ridge, but without development of incipient secondary palate as in Eubaena; preorbital skull length intermediate between Eubaena and Plesiobaena; cheek emargination not reaching lower level of orbit; lateral constriction of maxillae present; skull roof overlying CRISTA SUPRAOCCIPITALIs ending in point; jugal entering orbital margin; fronto-parietal suture tending to be curved. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | USA (Montana) | S. estesi (123100) | |
| Lancian | USA (Montana) | S. estesi (14654) | |
| Lancian | USA (Wyoming) | S. sp. (14505) | |
| Puercan | USA (Colorado) | S. estesi (14678 168453) S. sp. (206185) |