Ordosemys liaoxiensis ( Ji 1995 )

Zhou, Chang-Fu, Wu, Wen-Hao & Rabi, MAErton, 2019, Presence of the Jehol Biota turtle Ordosemys liaoxiensis in the Early Cretaceous Hengtongshan Formation of southern Jilin Province, China, Fossil Record 22 (2), pp. 57-64 : 58

Ordosemys liaoxiensis ( Ji 1995)

( Figs. 2–4 )

Specimens

XL-007 ( Fig. 3 ), a subadult specimen with most of the shell; XL-008 ( Fig. 4 ), a juvenile skeleton including a partial skull, cervicals, shell and forelimbs; XL-009 ( Fig. 2 ), an adult skeleton including a partial carapace, much of the plastron, and some appendicular bones. These fossils are deposited in the Paleontological Collection of Xingling Town (XL).

Locality and horizon

A quarry (GPS: 42 ◦ 24 Į 54.52 ĮĮ N, 125 ◦ 51 Į 02.21 ĮĮ E) near Shuanghe Village, Xingling Town, Meihekou City, southern Jilin Province, China ( Fig. 1 ); the Early Cretaceous Hengtongshan Formation (119–123 Myr).

Figures

Figure 1. (a) Fossil locality (asterisk; 42◦24Į54.52ĮĮ N, 125◦51Į02.21ĮĮ E) of Ordosemys liaoxiensis from the Early Cretaceous Hengtongshan Formation of Shuanghe Village, Xingling Town, Meihekou City, Jilin Province, northeastern China. (b) Outcrop of the fossil site showing five fossil-bearing layers; the turtle specimens described in this study are from the lower layer.

Figure 2. Ordosemys liaoxiensis (XL-009; most in visceral view) from the Early Cretaceous Hengtongshan Formation of Shuanghe Village, Xingling Town, Meihekou City, Jilin Province, northeastern China. (a, b) Carapace before preparation; (c, d) plastron and appendicular elements after preparation. Abbreviations: 1–2, neural plates 1–2; c1–c6, costal plates 1–6; cf, central plastral fenestra; co, coracoid; d2–d6, dorsal vertebrae 2–6; fe, femur; fi, fibula; hyo, hyoplastron; hyp, hypoplastron; is, ischium; lf, lateral plastral fenestra; pe, peripheral plate; pf, posterior medial plastral fenestra; pu, pubis; ti, tibia; v1–v2, vertebral scales 1–2; xi, xiphiplastron.

Figure 3. Ordosemys liaoxiensis (XL-007; in dorsal view) from the Early Cretaceous Hengtongshan Formation of Shuanghe Village, Xingling Town, Meihekou City, Jilin Province, northeastern China. Abbreviations:3–4, neural plates 3–4; c2–c8, costal plates 2–8; ib, inguinal buttress of the hypoplastron; p4–p9, peripheral plates 4–9; v3, vertebral scale 3.

Figure 4. Ordosemys liaoxiensis (XL-008; in dorsal view) from the Early Cretaceous Hengtongshan Formation of Shuanghe Village, Xingling Town, Meihekou City, Jilin Province, northeastern China. Abbreviations: 6, neural plate 6; c1–c8, costal plates 1–8; cf, central plastral fenestra; cs, cervical scale; cv, cervical vertebrae; hu, humerus; hyo, hyoplastron; hyp, hypoplastron; lf, lateral plastral fenestra; pe, peripheral plates; ul, ulna.