Articles | Volume 35, issue 2
J. Micropalaeontol., 35, 125–132, 2016
https://doi.org/10.1144/jmpaleo2015-013
J. Micropalaeontol., 35, 125–132, 2016
https://doi.org/10.1144/jmpaleo2015-013

  31 Jul 2016

31 Jul 2016

Formonsella pyramidosa (Haptophyta, Papposphaeraceae): a new weakly calcified coccolithophore genus from warm-water regions

Helge A. Thomsen1, Lluïsa Cros2, Elisa Malinverno3, Jette B. østergaard4, Mara Y. Cortés5, Markus Geisen6, and Jeremy R. Young7 Helge A. Thomsen et al.
  • 1Technical university of Denmark, National Institute of Aquatic Resources (DTU Aqua), Jægersborg Allé 1, 2920 Charlottenlund, Denmark
  • 2Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain
  • 3Department of Earth and Environmental Sciences (DISAT), University of Milano-Bicocca, Milano, Italy
  • 4Nørrebrogade 52a 5th, 2200 Copenhagen N, Denmark
  • 5Departamento Académico de Geología Marina, AICM UABCS, México
  • 6Diepeschrather Str. 6a, 51069 Köln, Germany
  • 7Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK

Keywords: coccolithophore, Papposphaeraceae, Formonsella gen. nov., SEM, TEM

Abstract. A new species Formonsella pyramidosa gen. et sp. nov. is described to accommodate a widely distributed warm-water coccolithophore species that has previously been referred to as Pappomonas sp. 2. Formonsella differs from Pappomonas with respect to, in particular, the detailed structure of the rim on both calicate and non-calicate coccoliths. In Formonsella the rim comprises two cycles of rod-shaped elements. Although elements in the distal layer are higher at one end, giving this cycle a serrate outline, the overall appearance is very different from the Pappomonas rim which encompasses a distal cycle of pentagonal elements, giving the rim a very distinct toothed appearance. Inverted rectangular pyramidal structures terminate the calicate F. pyramidosa coccoliths. In non-calicate coccoliths the central area calcification comprises differently sized tile-shaped elements, mostly arranged along the longitudinal axis in a rather irregular way.