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Figure 4 | BMC Evolutionary Biology

Figure 4

From: A new xinjiangchelyid turtle from the Middle Jurassic of Xinjiang, China and the evolution of the basipterygoid process in Mesozoic turtles

Figure 4

Skulls and partial neck of Xinjiangchelys wusu , Middle Jurassic, ?Qigu Formation, "Turtle Cliff", Shanshan area, Turpan Basin, Xinjiang Autonomous Province, China. A, PMOL-SGP A0100-1 (holotype), photograph and line drawing of skull and anterior cervical vertebrae in dorsal view; B, PMOL-SGP A0100-3, photograph and line drawing of skull, mandible and hyoid apparatus in ventral view. Abbreviations: ang: angular, bo: basioccipital, bpt: basipterygoid process, bs: basisphenoid, cb I.: cornu branchiale I, cor: coronoid, cv: cervical vertebra, de: dentary, ex: exoccipital, fcl: foramen caroticum laterale, fpccc: foramen posterius canalis carotici cerebralis, fpcci: foramen posterius canalis carotici interni, fpo: fenestra postotica, fpp: foramen palatinum posterius, fr: frontal, fst: foramen stapedio-temporale, ica: incisura columella auris, ipv: interpterygoid vacuity, ju: jugal, mx: maxilla, na: nasal, op: opisthotic, pa: parietal, pal: palatine, pfr: prefrontal, pmx: premaxilla, po: postorbital, pt: pterygoid, qj: quadratojugal, qu: quadrate, rs: rugose surface of processus trochlearis oticum, so: supraoccipital, sq: squamosal, sur: surangular, vo: vomer, * refers to fossa pterygoidea. A, X, G, H, Y refer to scales after Sterli and de la Fuente [16].

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