Cribrocentrum retiformis

Coccolithus? retiformis Reinhardt, 1966a

Stradnerius daviesii Haq, 1968 [Holotype: 7.6µm, Late Eocene]

Reticulofenestra pseudoscissura Haq, 1971 [Holotype: 7.0µm; Oligocene; a ring of elongate pores]

Reticulofenestra hampdenensis Edwards, 1973 [Holotype: 6.0µm; Late Eocene; a ring of elongate pores]

Length: 8.3µm

Medium to large elliptical species of Cribrocentrum (ranging from 5.0 to 10.0 μm) exhibit a permanent central cover with a single cycle of large pores and a finely perforated central field. The holotype of Cribrocentrum retiformis measures 8.3 μm and displays a ring of round pores along with a finely perforated central field on the cover of the central area. Similarly, the holotypes of Stradnerius daviesii (7.6 μm, with a ring of round pores), Reticulofenestra pseudoscissura (7.0 μm, with a ring of elongated pores), and Reticulofenestra hampdenensis (6.0 μm, with a ring of elongated pores) also feature a central cover with a single cycle of large pores and a finely perforated central field. Consequently, these species are considered synonyms of Cribrocentrum retiformis.

Edwards, A. R. 1973. Key species of New Zealand calcareous nannofossils. New Zealand Journal of Geology and Geophysics 16: 68-89.

Haq, B. U. 1968. Studies on upper Eocene calcareous nannoplankton from NW Germany. Stockholm Contributions in Geology 18: 13-74.

Haq, B. U. 1971. Paleogene calcareous nannoflora. Parts I-IV. Stockholm Contributions in Geology 25: 1-158.

Reinhardt, P. 1966a. Fossile Vertreter coronoider und styloider Coccolithen (Family Coccolithaceae Poche 1913). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 8: 513-524.