The genera Lepidorbitoides and Orbitcoides: evolution and stratigraphic significance in some Anatolian basins

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dc.contributor.authorOzcan, E
dc.contributor.authorOzkan-Altiner, S
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued1999
dc.departmentNiğde ÖHÜ
dc.description.abstractEarly ontogenetic morphologic features previously recognized as evolutionary parameters in Lepidorbitoides and Orbitoides have been tested in several flysch successions of Anatolia. Increase in embryo size (Li + ii), number of epi-embryonic chambers (E) and organization of embryonal chamber arrangement from 'quadrilocular' to 'bilocular' and multilocular in Orbitoides, increase in deuteroconch size (D), in deuteroconch-protoconch ratio (D/P) and in number of adauxiliary chambers (Ad) in Lepidorbitoides have been recognized as the main evolutionary trends, thus allowing the correlation of these features with time. The different developmental stages in Lepidorbitoides, i.e. L. pembergeri, L. campaniensis, L. bisambergensis, L. minor, L. socialis, and in Orbitoides, i.e. O. media, O. megaloformis, O. gruenbachensis, O. apiculata and O. gensacicus, have been described and illustrated based on the biometry of the populations. The values observed in some horizons, however, may not reflect the true phylogenetic stage of the orbitoidal taxa, especially in the species of Orbitoides, which usually show a wide variation of evolutionary parameters in the same population. A correlation scheme of phylogenetic development in Lepidorbitoides and Orbitoides with the planktonic foraminiferal zones is proposed. Lepidorbitoides populations with highly asymmetric 'quadriserial' nepionts occurring stratigraphically below the symmetric ones in Early Maastrichtian are thought to deserve a particular taxonomic status. In Orbitoides, a new embryonal chamber morphology previously undescribed from horizontal sections has been discovered. Copyright (C) 1999 John Wiley & Sons, Ltd.
dc.identifier.doi10.1002/(SICI)1099-1034(199907/09)34:3<275
dc.identifier.endpage286
dc.identifier.issn0072-1050
dc.identifier.issn1099-1034
dc.identifier.issue3
dc.identifier.startpage275
dc.identifier.urihttps://dx.doi.org/10.1002/(SICI)1099-1034(199907/09)34:3<275
dc.identifier.urihttps://hdl.handle.net/11480/5804
dc.identifier.volume34
dc.identifier.wosWOS:000085050300005
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherWILEY-BLACKWELL
dc.relation.ispartofGEOLOGICAL JOURNAL
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectLepidorbitoides
dc.subjectOrbitoides
dc.subjectearly ontogeny
dc.subjectbiometry
dc.subjectbiostratigraphy
dc.subjectplankton-benthos correlation
dc.subjectLate Cretaceous
dc.subjectAnatolia
dc.subjectTurkey
dc.titleThe genera Lepidorbitoides and Orbitcoides: evolution and stratigraphic significance in some Anatolian basins
dc.typeArticle

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