Biodiversity across the Guadalupian-Lopingian Boundary: first results on the ostracod (Crustacea) fauna, Chaotian section (Sichuan Province, South China)

Geodiversitas

Jean-François Deconinck¹  Qinglai Feng¹  Sindbad Zazzali¹  Sylvie Crasquin¹ 

关键词: Crustacea;    Ostracods;    South China;    Biodiversity;    Middle-Late Permian;    Guadalupian-Lopingian boundary;    Capitanian-Wuchiapingian;    new species;    Crustacea;    Ostracodes;    Chine du Sud;    Biodiversité;    Permien moyen et supérieur;    Limite Guadalupien-Lopingien;    Capitanien-Wuchiapingien;    espèces nouvelles;   

DOI  :  10.5252/g2015n3a1

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

TheMiddlePermian-LatePermianboundary(Guadalupian-Lopingianboundary,GLB)intervalischaracterisedbyimportantfaunalassemblagechanges.Thisextinction-turnoverepisodeisconsideredbysomeauthorstobethefirststepoftheend-Permianbiodiversitydrop.Theforty-fivemetersthicknessofsedimentencompassingtheGLBinChaotiansection(SichuanProvince,SouthChina)wassampledandprocessedforostracodstudy.ThisstudypresentsthefirstanalysisofostracodfaunasintheGLBinterval.Atotalof154speciesbelongingto29generaareidentified.Threespeciesaredescribedasnew:BairdiachaotianensisZazzali,n.sp.,MicrocheilinellawujiapingensisZazzali,n.sp.,MicrocheilinellapagodaensisZazzali,n.sp.Alltheostracodsdiscoveredinthesectionbelongtoshallowmarinetaxa.Sotheseresultsarenotconsistentwithpreviousinterpretations(lagoonalenvironmentordeepwatersetting)basedonotherevidences.AbundanceanddiversitypresentarapidandnoticeabledeclineintheEarlyCapitanian.RecoveryisthenrecordedaboutthreemetersabovetheGLB.Atspecificlevel,a93%extinctionrateanda96%turnoverratearerecordedattheGLB.Moreover,Palaeocopida,straightdorsalborderostracodsknowntoprogressivelydisappearfromtheLatePermiantothebasalMiddle-Triassic,areherelessabundantanddiversifiedaftertheGLB.ThiscouldreflectthefirststepoftheirdisappearanceattheendofthePalaeozoic.

【 授权许可】

Unknown