Cribrocentrum ornatum

Reticulofenestra ornata Müller 1970b

Dictyococcites callidus Perch-Nielsen, 1971c [Holotype: 7.1µm; Type level: Middle Eocene] ring of elongate pores

Dictyococcites onustus Perch-Nielsen, 1971c [Holotype: 7.3µm; Type level: Middle Eocene]

Length: 10.0µm

Medium to large (5.0-12.0 μm) elliptical species of Cribrocentrum comprises a permanent cover in the central area with a single cycle of large pores and a non-porous central field. The holotype of Cribrocentrum ornatum is 10.0 μm, featuring a cycle of round pores and a non-porous central field on the cover of the central area. The holotypes of Dictyococcites callidus (7.1 μm, with a cycle of elongated pores) and Dictyococcites onustus (7.3 μm, with a cycle of round pores) also have central covers in the central area with a single cycle of large pores and a non-porous central field. Therefore, both species are considered synonyms of Cribrocentrum ornatum.

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.