The genera Lepidorbitoides and Orbitoides: Evolution and stratigraphic significance in some Anatolian basins

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dc.contributor.authorÖzcan, Ercan
dc.contributor.authorÖzkan-Altiner, Sevinç
dc.date.accessioned2024-11-07T10:39:37Z
dc.date.available2024-11-07T10:39:37Z
dc.date.issued1999
dc.departmentNiğde Ömer Halisdemir Üniversitesi
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 + li), number of epiembryonic 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.
dc.identifier.doi10.1002/(SICI)1099-1034(199907/09)34:3<275
dc.identifier.endpage286
dc.identifier.issn0072-1050
dc.identifier.issue3
dc.identifier.scopus2-s2.0-0033501388
dc.identifier.scopusqualityQ2
dc.identifier.startpage275
dc.identifier.urihttps://doi.org/10.1002/(SICI)1099-1034(199907/09)34:3<275
dc.identifier.urihttps://hdl.handle.net/11480/11084
dc.identifier.volume34
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherJohn Wiley and Sons Ltd
dc.relation.ispartofGeological Journal
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241106
dc.subjectAnatolia
dc.subjectBiometry
dc.subjectBiostratigraphy
dc.subjectEarly ontogeny
dc.subjectLate Cretaceous
dc.subjectLepidorbitoides
dc.subjectOrbitoides
dc.subjectPlankton-benthos correlation
dc.subjectTurkey
dc.titleThe genera Lepidorbitoides and Orbitoides: Evolution and stratigraphic significance in some Anatolian basins
dc.typeArticle

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