The extinct Nerineoidea and Acteonelloidea (Heterobranchia, Gastropoda): a palaeobiological approach

Geodiversitas

Heinz A. Kollmann¹ 

关键词: Nerineoidea;    Acteonelloidea;    Heterobranchia;    Gastropoda;    Mesozoic;    functional morphology;    ecology;    diets and feeding;    phylogeny;    extinction;    new family;    Nerineoidea;    Acteonelloidea;    Heterobranchia;    Gastropoda;    Mésozoïque;    morphologie fonctionelle;    écologie;    régime alimentaire et mécanisme d'alimentation;    phylogénie;    extinction;    famille nouvelle;   

DOI  :  10.5252/g2014n3a2

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

Basedonthemorphologyoftheapertureandinternalplaitsorfolds,theNerineoideaZittel,1873aresubdividedintosevenfamilies:thePseudonerineidaePchelintsev,1965,CeritellidaeWenz,1940,NerinellidaePchelintsev,1960,Eunerineidaen.fam.(newfamilythatincludestheNerineidaeZittel,1873(pars)andtheDiptyxidaeBouchetamp;Rocroi,2005)thePtygmatididaePchelintsev,1960,NerineidaeandItieriidaeCossmann,1896.TheinternalplaitsoftheNerineoideahaddifferentfunctions:thecolumellarplaitssubdividedthecolumellarmuscleintostrands,whichallowedportionsofthefoottobemovedindividually.Atubelikespacedelimitedbytheparietalandpalatalplaitsiscomparedwiththepallialcaecumorposteriormantlechamberofheterobranchsandservedtherespiration.Wastefrombothmantlechamberswasexpelledthroughasubsuturalnotch,whichisthecommonfeatureoftheNerineoidea.TheNerineoideawereshelldraggersandprobablydepositfeederswithasemi-infaunalmodeoflife.The“LowerHeterobranchia”representedbytheStreptacidoideaKnight,1931,NerineoideaandActeonelloideaAkopjan,1976clusteroutsidetheEuthyneuraKnight,1931.TheActeonelloidea,thesecondgroupoflargeHeterobranchiaarerelatedtotheNerineoideaandcannotbepartoftheActeonoidea.TheextinctionoftheEunerineidaen.fam.,thePtygmatididaeandCeritellidaeintheLateCenomanianwascausedbyageneralwarminginlowlatitudes.TheActeonellidaegenusTrochactaeonMeek,1863replacedtheextinctEunerineidaen.fam.ecologicallyinshallowmarinesoft-bottomenvironmentsandbecameextinctitselfintheLowerCampanianduetothegeneralcooling.IntheCaribbeanpalaeobiologicalprovince,theendemicNerineoideagenusPlesioptygmatisBoese,1906extendedstratigraphicallytothebasalLateMaastrichtian.Acteonellad'Orbigny,1842andtheendemicActeonellidaegenusMexicotrochactaeonAkopjan,1972rangedupwardsintotheLateMaastrichtian.

【 授权许可】

Unknown