中国辽西早白垩世义县组—新的美颌龙类

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1、第40卷第2期2016年6月地质学刊JournalofGeologyV01．40No．2Jun．，2016doi：10．3969／j．issn．1674—3636．2016．02．191AnewspeciesofcompsognathidfromtheEarlyCretaceousYixianFormationofwesternLiaoning，ChinaItUYuanchao1，WANGXuri2，HUANGJiandong(1．GeologicalMuseumofAnhuiProvince，Hefei230031，Anhui，China；2．Institu

2、teofGeology，ChineseAcademyofGeologicalSci-ences，Beijing100037，China)Abstract：Thepaperreportsanewgenusandspeciesofeompsognathids：Beipiaognathusjii(gen．etsp．nov．)．ItpossessesnotonlythediagnosticcharactersofCompsognathidae，suchasthefan-shapeddorsalneuralspinesandrobustphalanxI-1，butals

3、osomeuniquecharacteristicsdifferentfromothereompsognathids，includingtheun—serratedconical-shapedteeth，relativelylongulna，robustandlongphalanxⅡ·1．andrelativelyshorttail．ThediscoveryfurtherrevealsthegreatdiversityofCompsognathidaeandprovidesmoreinformationforunderstandingtheanatomical

4、charactersofeompsognathids．Keywords：Coelurosauria；Compsognathid；EarlyCretaceous；YixianFormation；WesternLiaoning0IntroductionCompsognathidsareasmallgroupofmoderatelyprimitivetheropods，commonlyplacedatthebasalpo·sitionwithinCoelurosauria(Sereno，1999；Rauhut，2003；Hohzeta1．，2004；Norellet

5、a1．，2005)．Comp-sognathidae，originallynamedbyCope(1871)，isde—finedasCompsognathuslongipesandalltaxasharingamorerecentcommonancestorwithitthanwithPasserdomesticas．CompsognathidsarecurrentlyknownfromEurope，SouthAmericaandChina，rangingfromtheLateJurassictotheEarlyCretaceous(Peyer，2006)．

6、InformationaboutcompsognathidhasbeenknownonlyfromCompsognathasforalongtime．ButthediscoveryofSinosauropteryx(Jieta1．，1996；Cheneta1．，1998；Currieeta1．，2001)，Huaxiagnathus(Hwangeta1．，2004)andSinocalliopteryx(Jieta1．，2007)fromtheEadyCretaceousYixianFormationofChinahasgreatlyaidedourunder

7、standingoftheiranatomy．Compsognathidaecurrentlyconsistsof8taxa：Comp—sognathuslongipes，Aristosuchuspusillas(Owen，1876)，Sinosauropteryxprima(Jieta1．，1996)，Scip-ionyxsamniticus(Daleta1．，1998)，Huaxiagnathusorientalis(Hwangeta1．，2004)，Mirischiaasymmetrica(Naisheta1．，2004)，Juravenatorstar

8、ki(Gtihlicheta1．，20