We thank W. Skiebe (Oriental Motor GmbH, Gemany) and J. Meyer (Gloor Instruments, Switzerland) for providing technical help during design and construction of the portable stage. We acknowledge the assistance of B. Huber and the National Museum of Natural History in Washington, D.C., for permitting re-illustration of holotypes of menardiform globorotalids. We appreciate the comments by D. Polly, two anonymous reviewers, and the help of the Palaeontologia Electronica crew. M.Knappertsbusch acknowledges the support by the City of Basel and the Natural History Museum of Basel. K. Brown would like to acknowledge the financial support of the Swiss National Foundation for Scientific Research under the Project "Speciation of marine calcareous planktonic microfossils," Project No. 2100-067970/1.