Research Article| January 01, 2015 EVOLUTION AND PHYLOGENY OF MID-CRETACEOUS (ALBIAN–CONIACIAN) BISERIAL PLANKTIC FORAMINIFERA Shannon J. Haynes; Shannon J. Haynes 3 1Department of Geological Sciences, University of Missouri, 101 Geology Building, Columbia, MO 65211, USA 3Correspondence author. E-mail: sjh2c4@mail.missouri.edu Search for other works by this author on: GSW Google Scholar Brian T. Huber; Brian T. Huber 2Department of Paleobiology, MRC 121, Smithsonian Museum of Natural History, Washington, D.C. 20013, USA Search for other works by this author on: GSW Google Scholar Kenneth G. Macleod Kenneth G. Macleod 1Department of Geological Sciences, University of Missouri, 101 Geology Building, Columbia, MO 65211, USA Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (2015) 45 (1): 42–81. https://doi.org/10.2113/gsjfr.45.1.42 Article history received: 04 Nov 2013 accepted: 18 Aug 2014 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Shannon J. Haynes, Brian T. Huber, Kenneth G. Macleod; EVOLUTION AND PHYLOGENY OF MID-CRETACEOUS (ALBIAN–CONIACIAN) BISERIAL PLANKTIC FORAMINIFERA. Journal of Foraminiferal Research 2015;; 45 (1): 42–81. doi: https://doi.org/10.2113/gsjfr.45.1.42 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract In this paper we critically examine the biostratigraphy and systematics of late Albian–Coniacian biserial planktic foraminifera using measurements and qualitative observations from SEM and X-radiograph images of exquisitely preserved specimens from hemipelagic sediments of southeast Tanzania, augmented by analogous observations of selected Ocean Drilling Program samples and holotypes and paratypes of nearly all species. We document interspecific differences and intraspecific variability, and propose a revised phylogeny for Cretaceous biserial planktic foraminifera placed within a refined biostratigraphic framework. Taxonomic emendations are proposed for the genera ProtoheterohelixGeorgescu & Huber, 2009, and PlanoheterohelixGeorgescu & Huber, 2009, and for the species Pr. washitensis (Tappan, 1940), Pr. obscuraGeorgescu & Huber, 2009, Pl. moremani (Cushman, 1938), Pl. reussi (Cushman, 1938), and Laeviheterohelix reniformis (Marie, 1941). In addition, a neotype is designated for Pl. globulosa (Ehrenberg, 1840), and Pl. praenuttalli n. sp. is described. Biserial speciation events are recognized in the planktic foraminiferal Rotalipora cushmani Zone (latest Cenomanian), Helvetoglobotruncana helvetica Zone (early Turonian), and at the Helvetoglobotruncana helvetica-Marginotruncana schneegansi zonal boundary (middle Turonian). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.