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Jimemys glaebosus

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Journal Article

A new plastomenid trionychid (Testudines: Pan-Trionychidae) from Milk River Formation of southern Alberta (Cretaceous: Santonian)

Shauna C. Edgar, Don B. Brinkman, Michael J. Ryan, David C. Evans
Published: 11 March 2022
Canadian Journal of Earth Sciences (2022) 59 (4): 205–215.
DOI: https://doi.org/10.1139/cjes-2021-0040
... costal) and apomorphies (an emarginate nuchal, enlarged tubercles on the carapace, a wide pygal notch with a straight anterior edge, and a fused hyo-hypoplastron) that allows us to identify it as a new taxon, Jimemys glaebosus gen. et sp. nov. Phylogenetic analysis places J. glaebosus within...
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View PDF for article title, A new plastomenid trionychid (Testudines: Pan-Trionychidae) from Milk River Formation of southern Alberta (Cretaceous: Santonian)
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Image
Jimemys glaebosus (ROM 56647) neural fragments in dorsal view. Scale bar = 10 cm. [Colour online.]

Jimemys glaebosus (ROM 56647) neural fragments in dorsal view. Scale bar =...

Published: 11 March 2022
Fig. 3. Jimemys glaebosus (ROM 56647) neural fragments in dorsal view. Scale bar = 10 cm. [Colour online.]
Image
Jimemys glaebosus (ROM 56647) plastron with reconstruction. Shaded area indicates preserved material. (A) ventral view, (B) dorsal view. hy, hyoplastron; hyp, hypoplastron; xi, xiphiplastron. Scale bar = 10 cm. [Colour online.]

Jimemys glaebosus (ROM 56647) plastron with reconstruction. Shaded area in...

Published: 11 March 2022
Fig. 4. Jimemys glaebosus (ROM 56647) plastron with reconstruction. Shaded area indicates preserved material. (A) ventral view, (B) dorsal view. hy, hyoplastron; hyp, hypoplastron; xi, xiphiplastron. Scale bar = 10 cm. [Colour online.]
Image
Jimemys glaebosus (ROM 56647) carapacial elements with corresponding line drawings. (A) dorsal view of nuchal, (B) dorsal view of posterior portion of carapace, (C) ventral view of nuchal, (D) ventral view of posterior portion of carapace. Scale bar = 10 cm. (E) dorsal view of carapace texture under low angle light, (F) dorsal view of carapace tubercles. [Colour online.]

Jimemys glaebosus (ROM 56647) carapacial elements with corresponding line ...

Published: 11 March 2022
Fig. 2. Jimemys glaebosus (ROM 56647) carapacial elements with corresponding line drawings. (A) dorsal view of nuchal, (B) dorsal view of posterior portion of carapace, (C) ventral view of nuchal, (D) ventral view of posterior portion of carapace. Scale bar = 10 cm. (E) dorsal view of carapace
Image
(A) Carapace and (B) plastron of Atoposemys superstes (UCMP 133900, modified from Hutchison 2013); (C) carapace and (D) plastron of Aspideretoides foveatus (UALVP 33389, modified from Gardner et al. 1995); (E) carapace (MRF 525, modified from Joyce and Lyson 2011), (F) hyo-hypoplastra (MRF 467, 516, 534, 565), and xiphiplastra (MRF 549, 575) of Gilmoremys lancensis; (G) carapace and (H) plastron of Jimemys glaebosus (ROM 56647); (I) carapace and (J) plastron of Plastomenus thomasii (UCMP 158800); (K) carapace (NDGS 353, modified from Joyce and Lyson 2017) and (L) plastron (DMNH 125900, modified from Joyce and Lyson 2017) of Helopanoplia distincta; (M) carapace and (N) plastron of Hutchemys sterea (UCMP 130000); (O) carapace and (P) plastron of Hutchemys tetanetron (UCMP 125800); (Q) carapace (USNM 8538, modified from Sullivan et al. 2013) and (R) plastron (SMP VP-1667) of “Trionyx” robustus; (S) plastron of “Trionyx” austerus (PMU.R31, modified from Sullivan et al. 2013). Reconstruction of Jimemys glaebosus based on closely related Plastomenus thomasii UCMP 158800 and original ROM 56647 material. Scale bars = 10 cm.

(A) Carapace and (B) plastron of Atoposemys superstes (UCMP 133900, modif...

Published: 11 March 2022
-hypoplastra (MRF 467, 516, 534, 565), and xiphiplastra (MRF 549, 575) of Gilmoremys lancensis ; (G) carapace and (H) plastron of Jimemys glaebosus (ROM 56647); (I) carapace and (J) plastron of Plastomenus thomasii (UCMP 158800); (K) carapace (NDGS 353, modified from Joyce and Lyson 2017 ) and (L
Image
Strict consensus tree of five most parsimonious trees with implied weighting places Jimemys glaebosus (ROM 56647) as sister to a clade containing Plastomenus, Helopanoplia, and Hutchemys. Tick marks in Campanian delineate between early, middle, and late Campanian. S, Santonian; C, Campanian; M, Maastrichtian; D, Danian; Se, Selandian; T, Thanetian. Date ranges based on Gale et al. (2020).

Strict consensus tree of five most parsimonious trees with implied weightin...

Published: 11 March 2022
Fig. 6. Strict consensus tree of five most parsimonious trees with implied weighting places Jimemys glaebosus (ROM 56647) as sister to a clade containing Plastomenus , Helopanoplia , and Hutchemys . Tick marks in Campanian delineate between early, middle, and late Campanian. S, Santonian; C