Cribrocentrum albitectus
Set number: 659
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10µm
Set number: 660
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10µm
Dictyococcites albitectus de Kaenel & Bergen in Boseiger et al., 2017
Medium to large [5.0-10.0µm], elliptical species of Cribrocentrum Perch-Nielsen,1971c having a central area with prominent non-porous birefringent mesh.
Cribrocentrum albitectus differs from similar-sized Reiculofenestra Hay, Mohler & Wade, 1966 species by having a permanent birefringent central mesh visible in polarised light. It is distinguished from Cribrocentrum gartneri (Roth & Hay in Hay et al., 1967) Varol, n. comb. by having non-porous central mesh whilst later having porous mesh. Cribrocentrum lockeri and Cribrocentrum retisimilis is separated from Cribrocentrum albitectus by being larger than 10.0µm. The later further distinguished by having a central area at least twice greater than the width of the pelaga.
Similar specimens with broad tube cycles should be classified into different species.
Black, M. 1967. New names for some coccolith taxa. - Proceedings of the Geological Society of London 1640: 139-145.
Hay, W. W., Mohler, H. P., Roth, P. H., Schmidt, R. R. & Boudreaux, J. E. 1967. Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. - Transactions of the Gulf-Coast Association of Geological Societies 17: 428-480.
Hay, W. W., Mohler, H. P. & Wade, M. E. 1966. Calcareous nannofossils from Nal'chik (northwest Caucasus). Eclogae Geologicae Helvetiae 59: 379-399.
Müller, C. 1970b. Nannoplankton-Zonen der Unteren-Meeresmolasse Bayerns. Geologica Bavarica 63: 107-118.
Perch-Nielsen, K. 1971c. Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76.
Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A. 2017. Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. Journal of Nannoplankton Research. 37(2-3): 145-175.