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Operculina and Neoassilina:A Revision of Recent Nummulitid Genera Based on Molecular and Morphological Data Reveals a New Genus

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Journal of Earth Science 2022年第6期33卷 1411-1424页

作者： Maria Holzmann Johann Hohenegger Laure Apothéloz-Perret-Gentil Raphael Morard Sigal Abramovich danna titelboim Jan Pawlowski Department of Genetics and Evolution University of Geneva1211Geneva 4Switzerland Department of Paleontology Geozentrum1090WienAustria MARUM Center for Marine Environmental Sciences University of Bremen28359BremenGermany Department of Geological and Environmental Sciences Ben Gurion University of the NegevBeer Sheva84105Israel Institute of Oceanology Polish Academy of SciencesSopotPoland ID-Gene Ecodiagnostics 1202GenevaSwitzerland

The genus Operculina,a large symbiont-bearing benthic foraminifer,is characterized by high morphological variability showing thick involute to intermediate semi-involute to flat evolute *** morphotypes are either considered as ecophenotypes or distinct *** order to test the hypothesis of ecophenotypes versus different species,a single cell high throughput sequencing approach was applied to assess the interspecific diversity of *** results in two groups of ribotypes,one corresponding to Operculina ammonoides/Operculina discoidalis,the other containing Operculina complanata/Operculina *** groups can also be separated ***,*** and *** represent a single species and the latter can be regarded as a junior synonym of *** ammonoides and *** also form a single species,which makes the latter a junior synonym of *** generic differences in Operculina species are manifested in morphology and molecular genetics,the genus Neoassilina with the designated species Neoassilina ammonoides is *** analysis of ribosomal SSU rDNA data of eight recent nummulitid genera confirms the obtained high troughput sequencing results and further shows that Palaeonummulites venosus builds a clade with *** that branches at the base of other Nummulitidae containing Planostegina,Planoperculina,Cycloclypeus,Heterostegina,Operculinella and Neoassilina.

关键词： Operculina Neoassilina Nummulitidae interspecific diversity SSU rDNA morphology

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