Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Neurankylus eximius was named by Lambe (1902). Its type specimen is CMN 1504, a partial shell (left costals 3, 5-9 (9 is anomalous); right costals 3, 4; 8th neural; and suprapygal), and it is a 3D body fossil. Its type locality is Neurankylus eximius type locality, which is in a Campanian terrestrial horizon in the Dinosaur Park? Formation of Canada. It is the type species of Neurankylus.
Synonyms
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Synonymy list
Year | Name and author |
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1902 | Neurankylus eximius Lambe p. 42 fig. 7 |
1908 | Neurankylus eximius Hay p. 94 |
1908 | Charitemys captans Hay p. 98 figs. Telt-figs. 93-95 |
1930 | Neurankylus eximius Hay p. 70 |
1930 | Charitemys captans Hay p. 73 |
1933 | Baena fluviatilis Parks p. 19 figs. 1-2, Pl. 7: 1-2 |
1935 | Thescelus fluviatilis Gilmore p. 177 |
1972 | Neurankylus eximius Gaffney pp. 249, 291 figs. 38-39 |
1981 | Neurankylus eximius Mateer p. 63 |
1988 | Neurankylus eximius Sullivan et al. p. 2 |
1989 | Neurankylus eximius Bryant pp. 36-37 |
2002 | Neurankylus eximius Holroyd and Hutchison p. 181 |
2003 | Neurankylus eximius Hutchison and Holroyd |
2012 | Neurankylus eximius Sullivan et al. |
2013 | Neurankylus eximius Larson et al. |
2014 | Neurankylus eximius Perea et al. |
2015 | Neurankylus eximius Joyce and Lyson p. 161 |
2016 | Neurankylus eximius 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.
†Neurankylus eximius Lambe 1902
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Invalid names: Baena fluviatilis Parks 1933 [synonym], Charitemys captans Hay 1908 [synonym]
Diagnosis
Reference | Diagnosis | |
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E. S. Gaffney 1972 | [same as for genus Neurankylus] | |
D. W. Larson et al. 2013 | Neurankylus eximius is here rediagnosed
on the basis of the following autapomorphies: eighth neural and first suprapygal fused even when other carapacial sutures are open; coincidence of the fourth–fifth vertebral sulcus along the aforementioned fused suture; plastron length exceeding carapace width; intergulars only barely separating gulars and having little or no shared sulcus with humerals; and sigmoid intergular–gular sulcus oriented anterolaterally to posteromedially, creating a heart shape (Figs. 21.1b, 21.3). The species differs further from N. baueri in that the first–second costal suture is oriented anterolaterally, the posterior neurals are hexagonal with short sides anteriorly, the fifth vertebral is wider than second suprapygal, and the posterior margin of the carapace is smooth and not scalloped. It differs from both N. baueri and N. lithographicus in that its fourth marginals widen halfway along their length. N. eximius differs from N. baueri, N. lithographicus, and the Lance Formation Neurankylus in that the anterior margin of the carapace is squared off, but the carapace possesses a dorsal median keel as in N. baueri. The skull differs from that of N. lithographicus in being broadly wedge-shaped, with the opisthotic posterior width exceeding 1.5 times the dorsoventral height, the stapedial foramen is more than half of the anteroposterior length of the otic region away from the quadrate-squamosal suture, and the foramen nervi hypoglossi is directed posteriorly. | |
W. G. Joyce and T. R. Lyson 2015 | Neurankylus eximius is currently diagnosed as a baenid by the full list of characters listed above for that clade, and as a representative of Neurankylus by its large size, smooth shell that lacks both anterior and posterior notches, complete ring of marginals, wide vertebrals, small, undivided cervical that is taller than wide, lack of contact between the extragulars, large exposure of the prefrontal on the dorsal skull roof and small and triangular basisphenoid. Neurankylus eximius is currently differentiated from other Neurankylus by a wide vertebral V, no scalloping on the posterior edge of the shell, hexagonal posterior neural bones, the development of a weak, disrupted median keel on the carapace and moderate upper temporal emargination in the skull. |
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 (9 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Campanian | Canada (Alberta) | Baena fluviatilis (128457) | |
Late/Upper Campanian | Canada (Alberta) | Neurankylus eximius (22697 45261 46953 type locality: 128454 187581) | |
Middle Campanian - Late/Upper Campanian | USA (Montana) | Charitemys captans (128455) | |
Lancian | USA (Montana) | Neurankylus eximius (14639) | |
Late/Upper Maastrichtian | USA (Montana) | Neurankylus eximius (128458) |