On the Last Occurrence of Marginella Lamarck, 1799 (Gastropoda, Marginellidae) in the Mediterranean: Description of a New Species from the Early Pleistocene and Paleoceanographic Implications

Geodiversitas

Rafael La Perna¹  Angelo Vazzana¹ 

关键词: Marginella;    shape analysis;    Early Pleistocene;    Messina Strait;    Mediterranean;    paleoceanography;    new species;    Marginella;    analyse de contours;    Pléistocène inférieur;    Détroit de Messine;    Méditerranée;    paléoceanographie;    espèce nouvelle;   

DOI  :  10.5252/g2016n3a5

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

AnewspeciesofMarginellaLamarck,1799isdescribedfromtheEarlyPleistoceneoftheMessinaStraitarea,M.seguenzain.sp.Theremarkablevariabilityinshellsizeandshaperequiredapreliminarymorphometricanalysis,whichprovidedevidenceofasinglespecies.ThisisthelastknownrepresentativeofthegenusMarginellaintheMediterranean,todayhighlydiverseinthetropicalandsubtropicalshallowwatersofWestAfrica,uptoabout28°N.ThegenusMarginellawasthoughttohavedisappearedfromtheMediterraneanandtheadjacentAtlanticaftertheEarlyPliocene,duetoearlycoolingphases.Anyway,Marginellaseguenzain.sp.wasadeepwaterspecies,anditsextinctionwasmostprobablyduetothelossofpsychrosphere,intheEarlyPleistocene,ratherthantoclimaticdeterioration.Theremarkableclosenessbetweenthenewspeciesandadeepwaterlivingspecies,endemictothreeseamountsintheNEAtlantic,suggestsacommonoriginforbothspecies.HighproductivityseemstohavebeenakeyfactorintheMediterraneandistributionofMarginella,eitherinshallowanddeepwaters.

【 授权许可】

Unknown