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Trachemys haugrudi
Taxonomy
Trachemys haugrudi was named by Jasinski (2018). Its type specimen is ETMNH-8549, a partial skeleton (Nearly complete carapace missing portions of neural I, left costal VI, right peripherals VI and VII and a few other small carapace fragments, nearly complete pl), and it is a 3D body fossil. Its type locality is Gray Fossil Site, which is in a Hemphillian/Blancan sinkhole siltstone/conglomerate in Tennessee.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Trachemys haugrudi Jasinski p. 5 |
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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.
†Trachemys haugrudi Jasinski 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. E. Jasinski 2018 | Trachemys haugrudi is placed in the Emydidae due to the absence of musk ducts, inframarginals reduced to two, normal hexagonal neurals 2–8 (also occurs in a few batagurids (=geoemydids); e.g., Mauremys), and costal-inguinal buttress confined to C5. It is placed in the Deirochelyinae due to distinct lack of pectoral overlap of the entoplastron and lack of a hingable plastral lobe with ligamentous bridge connection (also present in some emydines). Diagnosed as a member of the genus Trachemys by features discussed by Seidel & Jackson (1990), including the combination of: a posteriorly strongly serrated oval carapace; a vertebral keel; low longitudinal ridges (mainly on pleurals (and costals)); alternating seams of the vertebral and pleural scutes that do not align; broad plastron this is notched posteriorly, lacks plastral hinge but possesses well-developed bridge; relatively shallow cranium rostral to the basisphenoid; relatively narrow zygomatic arch and narial openings; orbits located anterolaterally; broad triturating surface of the maxilla, with a medial ridge lacking tuberculate denticles; lacks cusps or serrations on outer cutting edges of jaws; narrow triturating surface of lower jaws; and ventral (lower) surface of the dentary is rounded when viewed anteriorly. T. haugrudi is distinct from all other fossil emydids by possession of the following suite of characters: (1) a notch between nuchal and peripherals I, at the anterior-most point of anterolateral surfaces of nuchal; (2) cervical region of nuchal may project anterior to the anterior-most points of the marginals I region, with significant notching between cervical and marginal I; (3) anteromedial border of epiplastra form “right angle” with medial border of epiplastron where it is sutured with opposite epiplastron; (4) more pronounced rugosity in T. haugrudi; (5) entoplastron projects anteriorly at humeral–gular sulcus (anteroposteriorly) in T. inflata, while in T. haugrudi it remains angled; (6) more pronounced notching of carapace in T. haugrudi (e.g., >34% notching (T. haugrudi) versus 20–33% notching on posterior peripherals (T. inflata)). The combination of the first four characters differentiate
T. haugrudi from all other species of Trachemys, while characters 5 and 6 further differentiate it from the closely related T. inflata. Additionally, T. haugrudi is further differentiated from T. inflata by; (1) T. haugrudi is less inflated (still more inflated than other Trachemys) than T. inflata (suggested by Parmalee et al., 2002); (2) anteroposterior length of nuchal under marginal I is the same length or longer than distance from posterior margin to vertebral I–pleural I–marginal I point in T. haugrudi versus less than to subequal to in T. inflata; and (3) anterior margin of pygal slightly concave posteriorly in T. inflata, while flat in T. haugrudi. Further comparisons follow in Remarks section. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Kiessling 2004, Carroll 1988, Uetz 2005 | |||||
Age range: base of the Late/Upper Hemphillian to the top of the Blancan or 9.40000 to 1.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hemphillian - Blancan | USA (Tennessee) | Trachemys sp. (type locality: 26574) |