Taxonomy and palaeobiogeography of charophytes from the Upper Eocene-Lower Oligocene of the Eastern Ebro Basin (Catalonia, NE Spain)

Geodiversitas

Carles martín-Closas¹  Josep Sanjuan¹ 

关键词: Charophyta;    Biogéography;    Eocene;    Oligocene;    Ebro foreland Basin;    Paris Basin;    Hampshire Basin;    Rhine Basin;    new species;    Charophyta;    biogéographie;    Éocène;    Oligocène;    bassin d'avant-pays de l'Ebre;    bassin de Paris;    bassin du Hampshire;    bassin du Rhin;    espèce nouvelle;   

DOI  :  10.5252/g2014n3a3

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

EighteencharophytespeciesaredocumentedfromtheUpperEocene-LowerOligocenetransitionalandterrestrialfaciesontheeasternEbroBasin.ThecharophyteassemblageiscomposedofoneEurasianspecies,Lychnothamnusstockmansii(Grambast,1957),fourteenspeciesdistributedthroughoutEurope(Harrisicharavasiformisformvasiformis-tuberculataFeist-Castel,1977,HarrisicharalineataGrambast,1957,Harrisicharatuberculata(Lyell,1826),Nitellopsis(Tectochara)merianii(Al.BraunexUnger,1852),Lychnothamnusvectensis(Groves,1926),L.grambastii(Feist-Castel,1971),L.major(Grambastamp;Paul,1965),Gyrogonacaelata(Reidamp;Groves,1921),Psilocharaaff.acutaGrambastamp;Paul,1965,Charaaff.antennataGrambast,1958,C.rhenanaSchwarzamp;Griessemer,1994,C.microceraGrambastamp;Paul,1965,SphaerocharalabellataFeistamp;Ringeade,1977,Lamprothamniumsp.)andthreespeciesrestrictedtotheEbroBasinduringtheintervalconsidered(NodosocharajorbaeChoi,1989,LychnothamnuslongusChoi,1989andCharaartesican.sp.,anewspeciesdefinedbyverysmallgyrogonitesandshowingareducednumberofconvolutions.AbiogeographicanalysisoftheassemblagestudiedsuggeststhatduringLateEoceneandEarlyOligocene,EuroperepresentedabioprovincecharacterisedbytheregularandabundantoccurrenceofspeciesbelongingtothelineagesofHarrisicharavasiformis-tuberculataandLychnothamnusstockmansii-major,alongwithNitellopsis(Tectochara)merianiiandCharamicrocerainallEuropeanbasins.Charophytedistributioninthisbioprovincedisplaysanorthtosouthpolaritywithareductioninthenumberofspecies.EcologicalfeaturesrelatedtothedynamicsoftheEbrobasin,suchasthehighterrigenousinputinfreshwaterwetlandsduringtheUpperEocene-Oligocene,areincontrasttothesea-connectedandcarbonaticsystemsoftheParis,HampshireandRhinebasins.ThisresultedinlowspeciesrichnessintheEbroBasin.ThesebiogeographicpatternshaveimplicationsintheuseofsomeEuropeanbiozones,whichshouldbeofuseonlyataregionalscale.

【 授权许可】

Unknown