Nannotax3 - ntax_cenozoic - Umbilicosphaera foliosa

Citation: Umbilicosphaera foliosa (Kamptner 1963) Geisen in Sáez et al., 2003

Basionym: Cycloplacolithus foliosus Kamptner 1963

Synonyms:

Umbilicosphaera rosaceus Lecal 1967 [according to Okada & McIntyre 1977]
Umbilicosphaera mirabilis Lohmann 1902 auctt. The type of U. mirabilis is a specimen of U. sibogae but in the literature the name U. mirabilis is often used for U. foliosa (e.g. McIntyre & Bé 1967)

Taxonomic discussion: This taxon was regarded as a variety of U. sibogae (U. sibogae var. foliosa) but there are strong morphological differences between U. sibogae and U. foliosa and cultures of the two species maintain their respective morphologies (Geisen et al. 2004). Molecular genetic data indicates that they are sibling species and suggests a divergence in the Miocene (Sáez et al. 2003).

Distinguishing features:
Parent taxon (Umbilicosphaera): Central area open
This taxon: Coccoliths circular; central area narrow, distal shield larger than proximal shield; proximal shield bicyclic

Coccosphere compact. Coccoliths circular with narrow central opening narrow; sutures on distal shield strongly kinked. Proximal shield bicyclic, concave, smaller than distal shield. A few hook-shaped protrusions are often present in the central opening.

Geological Range:
Notes: Probably evolves from U. jafari in the Pliocene. SEM (201-21) above, from the Early Miocene is a rather clear U. foliosa specimen from a sample set also with unambiguous U. jafari and U. rotula.
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN16 zone (2.49-3.70Ma, base in Zanclean stage). Data source: Young 1998

References:

Andruleit, H., Rogalla, U. & Staeger, S. (2005). Living coccolithophores recorded during the onset of upwelling conditions off Oman in the western Arabian Sea. Journal of Nannoplankton Research. 27(1): 1-14. gs

Bown, P. R., Dunkley-Jones, T. & Young, J. R. (2007). Umbilicosphaera jordanii Bown 2005 from the Paleogene of Tanzania: confirmation of generic assignment and a Paleocene origination for the family Calcidiscaceae. Journal of Nannoplankton Research. 29(1): 25-30. gs

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs

Kamptner, E. (1963). Coccolithineen-Skelettreste aus Tiefseeablagerungen des Pazifischen Ozeans. Annalen des Naturhistorischen Museums in Wien. 66: 139-204. gs O

Lecal, J. (1967). Le nannoplancton des Côtes d'Israel. Hydrobiologia. 29: 305-387. gs

Malinverno, E., Leoni , B. & Galli, P. (2022). Coccolithophore assemblages and a new species of Alisphaera from the Faafu Atoll, Maldives, Indian Ocean. Marine Micropaleontology. 172(102110): 1-16. gs

Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

Reid, F. M. H. (1980). Coccolithophorids of the North Pacific Central Gyre with notes on their vertical and seasonal distribution. Micropaleontology. 26(2): 151-176. gs

Yang, T. -N., Wei, K. & Wu, J. -T. (2012). Marine coccolithophores around Taiwan. Biodiversity Research Center, Academica Sinica, Taipei. 1-96. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs

Umbilicosphaera foliosa

References:

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