Corals from the Carboniferous of the central Sahara (Algeria): the collection “Marie Legrand-Blain”

Geodiversitas

Markus Aretz¹ 

关键词: Carboniferous;    Mississippian;    Pennsylvanian;    Rugosa;    Tabulata;    Algeria;    Sahara;    Mid-Carboniferous Boundary;    new genus;    new species;    Carbonifère;    Mississippien;    Pennsylvanien;    Tétracoralliaires;    Tabulés;    Algérie;    Sahara;    Limite médio-Carbonifère;    genre nouveau;    espèces nouvelles;   

DOI  :  10.5252/g2011n4a3

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

Thecollection“MarieLegrand-Blain”containsadiversefaunaofCarboniferouscoralsfromthemarinestrataoftheAlgerianSahara.Among96specimens,thereare34rugosecoraltaxaandfourtabulatecoraltaxa.Saharaphrentistirechouminoidensen.gen.,n.sp.,?Amplexizaphrentisillizidensisn.sp.andHaplolasmaparaarciferumn.sp.arenew.ThesupposedhighcoraldiversityoftheSaharabasinsisconfirmedbythepresentstudy.Theinterspecificandintraspecificvariabilitiesarehardlyknown,becausethenumberofspecimensislimited;commonlyasingleorfewspecimens.Thuspopulationscouldnotbestudiedandinsomecasesonlyanassignmentatgenericlevelispossible.Twomaincoralassociationscanbedistinguished.Undissepimentedsolitaryrugosecorals(“zaphrentids”)andmichelinidtabulatecoralsdominatetheshalyenvironments.Largerandmorecomplexsolitaryandcolonialrugosecoralsoccurmainlyincarbonateenvironments.TheMid-CarboniferousBoundaryisanimportantfaunalbreak.ItischaracterizedbythedisappearanceoftypicalMississippiansolitaryandcolonialtaxa.“Colonialaulinid”coralshaveonlybeenfoundbelowandabovetheboundarylevel.ThenewBashkiriancoralstockshowspalaeobiogeographicconnectionstothewesternUnitedStatesandtheDonetsBasin.ThestudiedcoralfaunadoesnotsupporttheassignmentofaBashkirianageforstrataintheIliiziBasinandtheAhnetandRegganebasins.TheMarieLegrand-BlaincollectionisagoodexampleoftheutilityofsucholdcollectionsforthestudyofCarboniferouscoralsfromtheoftenremoteandhardlyaccessibleAlgerianbasins.

【 授权许可】

Unknown