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Taxonomy
Thescelus was named by Hay (1908). Its type is Thescelus insiliens.
It was assigned to Neurankylidae by Carroll (1988); to Baeninae by Holroyd and Hutchison (2002); to Baenidae by Hay (1908), Hay (1930), Gilmore (1935), Gaffney (1972), Bryant (1989), Lyson and Joyce (2010) and Sullivan et al. (2012); and to Baenidae by Joyce and Lyson (2015).
It was assigned to Neurankylidae by Carroll (1988); to Baeninae by Holroyd and Hutchison (2002); to Baenidae by Hay (1908), Hay (1930), Gilmore (1935), Gaffney (1972), Bryant (1989), Lyson and Joyce (2010) and Sullivan et al. (2012); and to Baenidae by Joyce and Lyson (2015).
Species
T. insiliens (syn. Baena longicauda) (type species), T. rapiens
Synonymy list
| Year | Name and author |
|---|---|
| 1908 | Thescelus Hay p. 94 |
| 1930 | Thescelus Hay p. 73 |
| 1935 | Thescelus Gilmore p. 174 |
| 1972 | Thescelus Gaffney pp. 249, 297 fig. 42 |
| 1988 | Thescelus Carroll |
| 1989 | Thescelus Bryant p. 37 |
| 2002 | Thescelus Holroyd and Hutchison p. 181 |
| 2010 | Thescelus Lyson and Joyce |
| 2012 | Thescelus Sullivan et al. p. 343 |
| 2015 | Thescelus Joyce and Lyson |
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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 | |
|---|---|---|
| O. P. Hay 1908 | Carapace with an enamel-like surface, which is sculptured into raised dots and lines, the latter irregular in length and direction, with intervening pits and valleys. The front of the carapace shortened and excavated in the midline; the rear somewhat pointed. The plastron like that of Baena. Bridges broad, extending far forward. The buttresses feebly developt. | |
| E. S. Gaffney 1972 | 1) shell shape roughly round, sides not parallel; 2) ornamentation "an enamellike surface, which is sculptured into raised dots and lines, the latter irregular in length and direction, with intervening pits and valleys" (Hay, 1908, p. 94); 3) nuchal scute very narrow anteroposteriorly but wide laterally, bordered by small first marginals curving around emargination; 4) anterior of carapace broadly emarginated, peripherals not meeting in front of nuchal scute; 5) preneural bone absent; 6) first vertebral rectangular, supracostal scutes present or absent; 7) supramarginal scutes absent; 8) last vertebral scute not open posteriorly, last pair of marginals meeting medially behind vertebral; last marginals rectangular; 9) posterior edge of carapace not emarginated; 10) posterior edge of carapace not scalloped; 11) xiphiplastral notch absent; 12) paired intergulars present or absent, when present meeting medially as do gulars in all cases. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Late/Upper Campanian to the top of the Late/Upper Maastrichtian or 83.50000 to 66.00000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Utah) | T. insiliens (128462) T. sp. (187674) | |
| Late/Upper Campanian | USA (New Mexico) | T. rapiens (35518 154602) T. sp. (154379) | |
| Lancian | USA (Wyoming) | T. insiliens (128558) | |
| Lancian | Canada (Saskatchewan) | Baena longicauda (128461) | |
| Lancian | USA (Montana) | T. insiliens (14534) | |
| Late/Upper Maastrichtian | USA (Wyoming) | T. insiliens (45878) | |
| Late/Upper Maastrichtian | Canada (Saskatchewan) | T. sp. (45675) |