15094.貴州興義中三疊世黔魚龍(qianichthyosaurus)形態(tài)學及分支系統(tǒng)學研究

1、鹺版權(quán)聲明任何收存和保管本論文各種版本的單位和個人，未經(jīng)本論文作者同意，不得將本論文轉(zhuǎn)借他人，亦不得隨意復制、抄錄、拍照或以任何方式傳播。否則，引起有礙作者著作權(quán)之問題，將可能承擔法律責任。ASTUDYONTHEMOIU’HoRLoGYANDPHYLOGENYOFTHEQIANICHTHOSAURUS(REPTILIA：ICHTHYOSAURIA)FROMTHEMIDDLE1ⅪASSICOFXINGⅥ，GUIZHOUXingyiandi

2、tsadjacentareasarefamousfortheirMiddleTriassicFaunawhichhasyieldedagreatmanykindsofexquisitelypreservedmarinereptilesfossilsinthepastseveraldecades，includingmainlyKeichousaurus，aswellasNothorsaurusLariosaurus，Placodonts，

3、ichthyosaurs，thalattosaursandprotorosaursAlongwiththesereptiles，therealsohasbeenfoundnumerousspecimensoffishesandothertypesoforganisms，egarthropods，echinoids，ammonoidsandbivalvesIchthyosaurshavetakenanimportantpartinthec

4、ompositionoftheXingyiFauna，atleasttwogenera，GuizhousaurusandQianiththyosaurushavebeendocumentedThisstudyhasgivenadetailedredescriptionofthenewspecimenofQianichthyosaurufromtheZhuganpoMemberoftheFalangFormation(Ladinian，M

5、iddleTriassic)，WushaTown，XingyiCountyofGuizhouThediagnosisofthegenushasbeenrevised：toothsizerelativetotheskullwidthunderO1；ulnaperipheral‘shaft’notchedorlargelyreduced；femurnearlyequalorlongerthanhumerus；premaxillarposte

6、riorlypointed，scarecelyenteringtheanterioredgeofnarisThenewspecimendiffersfromthetypespecies，Qzhouiinhavingrelativelylongersnout(snoutlength／skulllengthbiggerthan60％)；humerusradialfacetbeingprominentlylargerthanulnarface

7、t；unenclosedobturatorforamenonpubis；posteriorprocessofthefibularandthesubtriangularischiumlackingshaftAncomprehensivecomparisonbetweenthetwogeneraQianichthyosaurusandToretocnemushasshowedagreatmanysimilaritiesintheskull，

8、pelvicgirdleandlimbs，whichinturnsuggeststheremaybesomeaffinitiesbetweenthem，andmorphologicallysupportsthevalidityofthefamilyToretocnemidae，erectedbyMaischeta1，(2000)basedononlyfewcharactersbecauseinformationonQianichthyo

9、sauruswasscarcethenPhylogeneticanalysishasconfirmedtheanticipatedsistergrouprelationshipofQzhouiandthenewspecimenofQianichthyosaurusAlsothepositionofthegenusQianichthyosaurusamongsuperorderIchthyopterygiahasbeenprelimina