A new Pennsylvanian Oriocrassatellinae from Brazil and the distribution of the genus Oriocrassatella in space and time

Geodiversitas

Marcello G. Simões¹  Paulo A. Souza¹  Luiz E. Anelli¹  Carlos Roberto González¹ 

关键词: Oriocrassatella;    bivalve;    Gondwana;    Upper Paleozoic;    glaciation;    paleobiogeography;    new species;    Oriocrassatella;    bivalve;    Gondwana;    Paléozoïque supérieur;    glaciation;    paléo biogéographie;    espèce nouvelle;   

DOI  :  10.5252/g2012n3a2

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

OriocrassatellaEtheridgeJr.,1907isalongrangecrassatellidbivalvegenuswellrecognizedinshallowwatersofepeiricseasthroughouttheupperpartofPaleozoic.ThefirstoccurrencesofthisgenusarerecordedinthesedimentarysuccessionsoftheGondwana,bothinAustraliaandSouthAmerica.However,thegeographicandagedistributionofOriocrassatellainLateMississippiandepositsofAustraliaandArgentinamayindicateanearliestViseanorevenapre-Viseanoriginforthegenus.FollowingitsorigininEarlyCarboniferousacomplexpaleobiogeographichistoryfromSoutherntoNorthernHemispheretookplaceinthePermian.DuringitsinitialdispersalphasefromLateCarboniferoustotheEarlyPermianthegenusthrivedincoldwaterenvironmentsassociatedtotheLatePaleozoicGondwanaglaciation.Shallow-waterbottomsofthewarmwatersofthecentralGondwanafringeandLaurussiawerecolonizedbyOriocrassatellaonlyduringEarlyPermiantimeswhenthegenusbecamecosmopolitan.Anewspeciesofthisgenusisdescribedherein,Oriocrassatellapiauiensisn.sp.,recordedfromthePiauíFormation,PennsylvanianoftheParnaíbaBasin.Thisnewspeciesmayrepresentanearlyadaptationtowarmwaters.However,basedonavailabledata,speciesofthisgenusseemtohaveadapteddefinitelytowarmwaterenvironmentsprobablyrelatedtheLatePennsylvanianinterglacialphases.Inthesephases,climaticbarrierwereinterruptedallowingthefaunalinterchangeandlarvaldispersionfollowingaSouthtoNorthmigrationroutethroughtheeasternmarginsofGondwanaandtheeasternPaleotethys.

【 授权许可】

Unknown