High biodiversity in Polychelida crustaceans from the Jurassic La Voulte-sur-Rhône Lagerstätte

Geodiversitas

Jean-Paul Saint Martin¹  Denis Audo¹  Günter Schweigert¹  Sylvain Charbonnier¹ 

关键词: Eryonidae;    Polychelidae;    Coleiidae;    Callovian;    palaeoecology;    bathyal;    palaeoenvironment;    nodule;    new genera;    new species;    Eryonidae;    Polychelidae;    Coleiidae;    Callovien;    paléoécologie;    bathyal;    paléoenvironnement;    nodule;    genres nouveaux;    espèces nouvelles;   

DOI  :  10.5252/g2014n4a1

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

TheMiddleJurassicLaVoulte-sur-RhôneLagerstättepreserveswithremarkabledetailsahighlydiversifiedbathyalpalaeocommunitydominatedbyarthropods.PolychelidaScholtzamp;Richter,1995areparticularlyabundantandarecurrentlyrepresentedbyEryonellipticusVanStraelen,1923,Proeryongiganteus(VanStraelen,1923),Hellerocarisfalloti(VanStraelen,1923),andWillemoesiocarisovalis(VanStraelen,1923).Thisnewinvestigationrevealsthepresenceoftwonewgeneraandthreenewspeciesinthiscrustaceancommunity:Voulteryonparvulusn.gen.,n.sp.,Cycleryonromanin.sp.,whichistheoldestoccurrenceofthegenus,andAdamanteryonfournetin.gen.,n.sp.,anenigmaticpolychelidanofuncertainaffinities.ThegenusProeryonBeurlen,1928isalsorevisedtosolveproblemsofhomonymy,andasaconsequencewehereproposethereplacementnameProeryonzehentbaueriproProeryongiganteusBeurlen,1930,nonProeryongiganteus(VanStraelen,1923).ThesenewresultsplacetheLaVoultepolychelidanlobstercommunityatthefirstrankintermsoffamilialandgenericdiversity(threefamilies,sevengenera)andatthesecondrankintermsofspeciesdiversity(sevenspecies)justaftertheLateJurassicEichstättLagerstätte(eightspecies).Thankstomoderntechniques,suchasX-raytomography,thisstudyalsodocumentsstructuresneverobservedbeforesuchasthoracicappendagesofProeryongiganteusandHellerocarisfalloti.InthecaseofHellerocarisfalloti,thesenewobservationssuggestitisoneoftheclosestfossilrelativestoextantpolychelids.

【 授权许可】

Unknown