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A NEW SPECIMEN OF THE TRIASSIC PISTOSAUROID YUNGUISAURUS, WITH IMPLICATIONS FOR THE ORIGIN OF PLESIOSAURIA (REPTILIA,
SAUROPTERYGIA)
by TAMAKI SATO, LI-JUN ZHAO, XIAO-CHUN WU and CHUN LI

[Palaeontology, Vol. 57, Part 1, 2014, pp. 55–76]

satochunlipalassauropyunguistriasspistosaurpala.12048.pdf

satyungslesoth1 (9).jpg

 

" Revised diagnosis. Differing from known pistosauroids in the combination of the following characters: single interpterygoid vacuity with a narrow anterior extension, anterior
extension of parasphenoid, at least six premaxillary teeth,elongate snout with slender teeth, pineal foramen reachingfrontal/parietal suture, nasal present, longitudinal ridge on
temporal bar, sharp parietal crest, lack of squamosal bulbat posterior end of skull table, long mandibular symphysis,prominent coronoid process, constriction of snout and
mandible (in adult individuals), about 50 cervical vertebrae with short neural arch and accessory articulation (zygosphene/zygantrum), rod-shaped chevrons not united
medially, sickle-shaped clavicle, small scapula withoutventral plate, dorsal process of scapula slightly widen,absence of interglenoidal thickening of coracoids, semicircular
pubis, long shaft of ilium, slender humerus and epipodials, hourglass-shaped ulna, at least 11 carpals and 8 tarsals (in adult individuals), hyperphalangy in manus"

 

 

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