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 tests. Different morphotypes are either considered as ecophenotypes or distinct species. In order to test the hypothesis of ecophenotypes versus different species, a single cell high throughput sequencing ap-proach was applied to assess the interspecific diversity of Operculina. This results in two groups of ribo-types, one corresponding to Operculina ammonoides/Operculina discoidalis, the other containing Oper-culina complanata/Operculina elegans. These groups can also be separated morphologically. Therefore, O. complanata and O. elegans represent a single species and the latter can be regarded as a junior syn-onym of O. complanata. Operculina ammonoides and O. discoidalis also form a single species, which makes the latter a junior synonym of O. ammonoides. Because generic differences in Operculina species are manifested in morphology and molecular genetics, the genus Neoassilina with the designated spe-cies Neoassilina ammonoides is installed. Additional analysis of ribosomal SSU rDNA data of eight re-cent nummulitid genera confirms the obtained high troughput sequencing results and further shows that Palaeonummulites venosus builds a clade with O. complanata that branches at the base of other Nummulitidae containing Planostegina, Planoperculina, Cycloclypeus, Heterostegina, Operculinella and Neoassilina.

Maria Holzmann;Johann Hohenegger;Laure Apothéloz-Perret-Gentil;Raphael Morard;Sigal Abramovich;Danna Titelboim;Jan Pawlowski

Department of Genetics and Evolution,University of Geneva,1211 Geneva 4,Switzerland;Department of Paleontology,Geozentrum,1090 Wien,Austria;ID-Gene Ecodiagnostics,1202 Geneva,Switzerland;MARUM Center for Marine Environmental Sciences,University of Bremen,28359 Bremen,Germany;Department of Geological and Environmental Sciences,Ben Gurion University of the Negev,Beer Sheva 84105,Israel;Institute of Oceanology,Polish Academy of Sciences,Sopot,Poland

地球科学学刊（英文版）

[1]Maria Holzmann;Johann Hohenegger;Laure Apothéloz-Perret-Gentil;Raphael Morard;Sigal Abramovich;Danna Titelboim;Jan Pawlowski-.Operculina and Neoassilina:A Revision of Recent Nummulitid Genera Based on Molecular and Morphological Data Reveals a New Genus)[J].地球科学学刊（英文版）,2022(06):1411-1424

Operculina,Neoassilina,Nummulitid,Genera,symbiont,foraminifer,involute,evolute,ecophenotypes,ammonoides,discoidalis,Oper,culina,complanata,onym,nummulitid,troughput,Palaeonummulites,Nummulitidae,Planostegina,Planoperculina,Cycloclypeus,Heterostegina,Operculinella

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