georefid:1985-003769SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1985-003769<gco:CharacterString>Species formation through punctuated gradualism in planktonic foraminifera</gco:CharacterString>1984-01-01publicationgeorefid:1985-003769Malmgren, Bjoern A.Univ. Uppsala, Dep. Paleontol., Uppsala, SwedenauthorBerggren, W. A.Woods Hole Oceanogr. Inst., United StatesauthorLohmann, G. P.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentHardcopyScience225 (4659)317-319Analysis of evolutionary changes in a 10-million-year long Late Neogene lineage of planktonic foraminifera has revealed a pattern that is not consistent with either the gradualistic or the punctuational model of evolution. The lineage was in stasis over a considerable part of its total duration but underwent relatively rapid, but not geologically instantaneous, gradual morphologic change that did not lead to lineage splitting. The term punctuated gradualism is suggested for this evolutionary modality.--Modified journal abstract.completedInvertebrate paleontologyCenozoicDeep Sea Drilling ProjectDSDP Site 214evolutionForaminiferaGlobigerinaceaGloborotaliaGloborotalia plesiotumidaGloborotalia tumidaGloborotaliidaeIndian OceanInvertebrataLeg 22lineagemarine environmentmicrofossilsMiocenemorphologyNeogeneNinetyeast Ridgenomenclaturepaleontologyplanktonic taxaProtistapunctuated gradualismQuaternaryRotaliinaTertiaryurn:org.iodp:exp:22urnlargerWorkCitationcampaignurn:org.iodp:exp:22:site:214urnlargerWorkCitationstudyurn:org.iodp:exp:22urnlargerWorkCitationcampaignEnglishgeoscientificInformation89.000089.0000-11.0000-11.0000