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A New Specimen of the Triassic Pistosauroid Yunguisaurus, With

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A New Specimen of the Triassic Pistosauroid Yunguisaurus, With [Palaeontology, 2013, pp. 1–22] A NEW SPECIMEN OF THE TRIASSIC PISTOSAUROID YUNGUISAURUS, WITH IMPLICATIONS FOR THE ORIGIN OF PLESIOSAURIA (REPTILIA, SAUROPTERYGIA) by TAMAKI SATO1,2*, LI-JUN ZHAO3,XIAO-CHUNWU2 and CHUN LI4 1Tokyo Gakugei University, 4-1-1 Nukui-Kita-Machi, Koganei City, Tokyo 184-8501, Japan; e-mail: [email protected] 2Canadian Museum of Nature, PO Box 3443 STN ‘D’, Ottawa, ON Canada, K1P 6P4; e-mail: [email protected] 3Zhejiang Museum of Natural History, 6 Westlake Cultural Plaza, Hangzhou 310014, China; e-mail: [email protected] 4Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing, 10004, China; e-mail: [email protected] *Corresponding author. Typescript received 19 March 2012; accepted in revised form 24 March 2013 Abstract: An adult skeleton of the pistosauroid sauroptery- marine reptiles and does not serve as a precursor of the plesio- gian Yunguisaurus liae reveals a number of morphological fea- saurian pattern with fewer mesopodia of different topology; it tures not observed in the holotype, such as the complete demonstrates variability of the limb morphology among the morphology of the skull roof, stapes, atlas and axis, ventral Triassic pistosauroids. The pectoral girdles of Corosaurus, view of the postcranium, and nearly complete limbs and tail. Augustasaurus and Yunguisaurus may indicate early stages of Size and morphological differences between the two specimens the adaptation towards the plesiosaurian style of paraxial limb are mostly regarded as ontogenetic variation, and newly added movements with ventroposterior power stroke. data did not affect the phylogenetic relationships with other pistosauroids significantly. The number of mesopodia (11 car- Key words: pistosauroids, origin of Plesiosauria, Yungui- pals and 8 tarsals) exceeds that known in any other Triassic saurus liae, Triassic. YUNGUISAURUS LIAE Cheng et al., 2006 is a pistosauroid and the ventral structure of the girdles. In this study, we sauropterygian recently discovered in the Middle Triassic describe Zhao’s specimen on characteristics not available in of China. The holotype specimen is a nearly complete the holotype, assess the differences between the two speci- juvenile skeleton, and a full description with a phyloge- mens, re-evaluate the phylogeny and discuss the morpho- netic analysis (Sato et al. 2010) demonstrated a mosaic of logical and functional evolution of the girdle and limbs of primitive (i.e. shared with basal sauropterygians) and Triassic pistosauroids and the accumulation of the features derived (i.e. more plesiosaurian) features, as well as its towards the unique mode of locomotion in the Plesiosauria. relationship with other pistosauroid taxa and relevance to the origin of plesiosaurian body plan. Despite its superfi- Institutional abbreviations. NMNS: National Museum of Natural cial similarity to the plesiosaurian body plan, it was dem- Science, Taichung, Taiwan, China; ZMNH: Zhejiang Museum of onstrated that other pistosauroids such as Pistosaurus and Natural History, Hangzhou, Zhejiang, China. Augustasaurus are more closely related to the Plesiosauria. Meanwhile, possible phylogenetic effects of ontogenetic changes to the juvenile skeleton remained unknown, and SYSTEMATIC PALAEONTOLOGY interpretation of certain characteristics, such as those of posterior portion of skull roof, coracoid and limb bones, SAUROPTERYGIA Owen, 1860 requires additional specimen(s) for morphological clarifica- PISTOSAUROIDEA Baur, 1890 tion (Sato et al. 2010). YUNGUISAURUS Cheng, Sato, Wu and Li, 2006 Another, mostly complete but much larger pistosauroid skeleton was briefly reported by Zhao et al. (2008a) and Yunguisaurus liae Cheng, Sato, Wu and Li, 2006 tentatively referred to Yunguisaurus cf. liae. Further prepa- Figures 1–9 ration and subsequent studies confirm this referral and reveal a number of features wanting in the holotype skele- 2008 Yunguisaurus cf. liae Zhao, Sato, Wu and Li, ton, including a complete skull roof, tail, limb extremities pp. 283–286, figs 1–2. © The Palaeontological Association doi: 10.1111/pala.12048 1 2 PALAEONTOLOGY Holotype. NMNS 004529/F003862; articulated specimen in dor- sixth dentary tooth (Fig. 2B), but not in the holotype. The snout sal view, missing most of the tail and tips of the limbs. length (anterior tip of the skull to the anterior edge of the orbit) is <45 per cent of the skull length (anterior tip of the skull to Referred material. ZMNH M8738; a nearly complete and articu- the posterior end of the occipital condyle), and this proportion lated skeleton in ventral view, with its skull prepared on both is approximately same as in the holotype (46 per cent). sides. The premaxilla–maxillary sutures are not exactly symmetrical but clearly marked on both sides, and there are six premaxillary Locality and horizon. Zhuganpo Member of Falang Formation teeth on both sides (uncertain but estimated to be up to seven in (Ladinian, upper Middle Triassic) in Fuyuan County, Yunnan the holotype: Sato et al. 2010). The frontals are mostly fused, and Province, China (Wang et al. 2008; Zhao et al. 2008a, b). the midline suture is closed and raised, indicating an advanced stage of ossification. A short suture and an obvious change in the texture mark the postfrontal/postorbital contact at the junction of Revised diagnosis. Differing from known pistosauroids in the postorbital bar and the temporal arch (Fig. 4). The postorbital the combination of the following characters: single interp- reaches nearly the posterior end of the temporal arch, and it later- terygoid vacuity with a narrow anterior extension, anterior ally overlies the squamosal at the ventral edge of the supratempo- extension of parasphenoid, at least six premaxillary teeth, ral fenestra as in Pistosaurus; the posterior extension is not so long elongate snout with slender teeth, pineal foramen reaching in Augustasaurus (Rieppel et al. 2002) and basal plesiosaurs such frontal/parietal suture, nasal present, longitudinal ridge on as Stratesaurus and Avalonnectes (Benson et al. 2012), in which temporal bar, sharp parietal crest, lack of squamosal bulb the extension remains anterior one- to two-thirds. The longitudi- at posterior end of skull table, long mandibular symphysis, nal ridge on the lateral surface of the temporal arch is present but prominent coronoid process, constriction of snout and less pronounced in the referred specimen than in the holotype. The jugal–postorbital suture is traceable on both sides of the skull mandible (in adult individuals), about 50 cervical verte- but unclear in places. brae with short neural arch and accessory articulation ZMNH M8738 reveals the complete morphology of the skull (zygosphene/zygantrum), rod-shaped chevrons not united roof for the first time (Fig. 4). The anterior ends of the parietals medially, sickle-shaped clavicle, small scapula without are separated by the pineal foramen, and the midline suture is ventral plate, dorsal process of scapula slightly widen, traceable along the entire parietal crest, which is widest behind absence of interglenoidal thickening of coracoids, semicir- the pineal foramen and gradually thins posteriorly. The antero- cular pubis, long shaft of ilium, slender humerus and lateral portion of the parietal forms much of the anterior wall of epipodials, hourglass-shaped ulna, at least 11 carpals and the temporal fossa. The paired parietals roof the braincase; the 8 tarsals (in adult individuals), hyperphalangy in manus roof narrows posteriorly and is constricted in the posterior one- (1-5-8/9-7-4; revised from Cheng et al. 2006). third and then gradually widens again to meet the squamosals at the posterior edge of the temporal fossa. Such a posterior expan- sion is likely plesiomorphic for the Pistosauroidea, because it variably develops among the Triassic forms (e.g. Cymatosaurus, Description Augustasaurus) and plesiosaurs such as rhomaleosaurids (sensu Benson et al. 2012), which later develops into the large ‘parietal The following description focuses on the morphological differ- wing’ consisting of the parietal and squamosal in some Creta- ences between the holotype (NMNS 004529/F003862; Cheng ceous plesiosaurs (e.g. Nichollssaura and Dolichorhynchops: Sato et al. 2006, Sato et al. 2010) and the referred specimen ZMNH 2002, 2005; Druckenmiller and Russell 2008), whereas such a M8738, as well as the parts missing in the former (for skeletal structure is absent in most Jurassic plesiosaurs such as Plesiosau- measurements, see Table 1). rus and Cretaceous elasmosaurids (Storrs 1997; Sato 2003). The Total length of ZMNH M8738, including estimated length for squamosals meet at the midline and form the posterior edge of the missing distal end of the tail (10 cm), is about 4.2 m the skull roof, and the midline union has a short anterior pro- (Fig. 1). The juvenile holotype is missing the tail after the 91st cess that wedges between the parietals. On the posterior edge of = vertebra ( the 16th caudal) and measures about 1.7 m long the skull roof, the united squamosals form a shallow V-shaped from the tip of the premaxilla to the end of preserved tail; the embayment; they lack the squamosal bulb, contrasting with the corresponding length (the tip of the premaxilla to the 91st verte- situation in Augustasaurus and many short-necked plesiosaurs bra) in the ZMNH specimen is just over 3 m and thus 1.8 times (O’Keefe 2001; Benson et al. 2012). The suspensorium is dorso- longer than the holotype. The ZMNH skull is 1.7 times longer ventrally compressed postdepositionally, but it appears that the than that of the holotype. quadrate would have reached at least to the height of the lower edge of temporal opening in life. Skull. The skull, mandible and a few attached vertebrae were Incomplete epipterygoids are preserved on both sides. The left removed from the slab and prepared separately. As in the exoccipital-opisthotic (Fig. 2C) is in or near life position, as the holotype, the skull was compressed dorsoventrally. An obvious long and flat paroccipital process maintains contact with the sus- difference between the two specimens is the outline of the snout pensorium.
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