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

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

机构地区：[1]Department of Genetics and Evolution,University of Geneva,1211,Geneva 4,Switzerland [2]Department of Paleontology,Geozentrum,1090,Wien,Austria [3]MARUM Center for Marine Environmental Sciences,University of Bremen,28359,Bremen,Germany [4]Department of Geological and Environmental Sciences,Ben Gurion University of the Negev,Beer Sheva,84105,Israel [5]Institute of Oceanology,Polish Academy of Sciences,Sopot,Poland [6]ID-Gene Ecodiagnostics,1202,Geneva,Switzerland

出　　处：《Journal of Earth Science》2022年第6期1411-1424,共14页地球科学学刊（英文版）

基　　金：supported by Israel Science Foundation(No.1267/21)to Sigal Abramovich;the Swiss National Science Foundation(No.31003A_179125)to Jan Pawlowski;Open Access funding provided by University of Geneva。

摘　　要：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 approach was applied to assess the interspecific diversity of Operculina.This results in two groups of ribotypes,one corresponding to Operculina ammonoides/Operculina discoidalis,the other containing Operculina 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 synonym 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 species Neoassilina ammonoides is installed.Additional 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 O.complanata 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 

分 类 号：Q959[生物学—动物学]