Micromorph brachiopods from the late Asbian (Mississippian, Visean) from northwest Ireland (Gleniff, County Sligo)

Bulletin of geosciences

Simon E¹  Sevastopulo G¹  Mottequin B¹ 

关键词: Carboniferous;    Asbian;    Meenymore Formation;    Brachiopoda;    micromorph;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

AdiverseassemblageofminutebrachiopodsisreportedfromtheVisean(lateAsbian)MeenymoreFormationexposedintheGleniffoutlier,CountySligo,northwestIreland.Theassemblageincludes14micromorphspeciesandjuvenilesoflargerspecies,inwhichspire-bearers(Athyridida,SpiriferidaandSpiriferinida)arethemostdiverse.Mostofthespeciesareleftinopennomenclatureasonlyfewspecimensshowinternalfeatures.However,anewspeciesoftheuncommonorthotetideDrahanorhynchus(D.gleniffensissp.nov.),previouslyknownfromtheMississippianoftheCzechRepublic,SpainandGermany,isdescribed.Inaddition,thelectotypeoftheathyridideHustediamultiplicata(deKoninck,1887),fromtheTournaisianofTournai(Belgium)isselectedandillustratedphotographicallyforthefirsttime.ThebrachiopodsfromGleniffareassociatedwithothersmall-sizedbenthicorganismsparticularlyechinodermsandmolluscs(gastropods,rostroconchs).Theenvironmentalfactors,whichleadtothesmallsize,arenotclearlyunderstoodalthoughtheyprobablyincludedacombinationofbiological(e.g.foodsupply)andphysicochemical(e.g.wateroxygenation)parameters.Salinityisprobablynotimplicatedbecausebrachiopodsandechinodermsaregenerallystenohaline.

【 授权许可】

Unknown