Reticulofenestra primitiva
Set number: 1685
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Set number: 1684
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10µm
Set number: 1680
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10µm
Set number: 1683
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10µm
Set number: 1682
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Set number: 1681
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10µm
Reticulofenestra primitiva Gheta, 1982
Reticulofenestra circus de Kaenel & Villa, 1996 [Holotype: 8.2µm, Early Oligocene]
Reticulofenestra wadeae Bown, 2005d [Holotype: 9.1µm, Middle Eocene]
Length: 8.6µm
Reticulofenestra primitiva is a large (8.0-12 μm), subcircular species characterised by a larger distal shield than the proximal shield and a void central area distinctly narrower than the width of the pelaga. Its optical properties, including inclined dextrogyre extinction lines (with angles typically around 9° on the distal shield and 77° on the tube cycles on the distal side) and length-fast (-) elongation, are consistent with those of the genus Reticulofenestra. Synonyms recognised for their shared characteristics include Reticulofenestra circus and Reticulofenestra wadeae, with holotypes measuring 8.2 μm and 9.1 μm, respectively. The holotype of Reticulofenestra primitiva measures 8.6 μm.
Gheta (1982) provided SEM observations based on paratype material; however, the holotype is the LM illustration, which unequivocally represents a senior synonym of Reticulofenestra circus and Reticulofenestra wadeae.
According to the International Code of Nomenclature (ICN), species are defined by their holotype, not by diagnosis or descriptive elements.
As stated in ICN Article 9.1, “As long as the holotype exists, it fixes the application of the name concerned.”
Furthermore, ICN Article 38.2. A clarifies that “A diagnosis of a taxon is a statement of that which in the opinion of its author distinguishes the taxon from other taxa.”
Bown, P. R. 2005d. Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research 27(1): 21-95.
de Kaenel, E. & Villa, G. 1996. Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results 149: 79-145.
Gheta, N. 1982. The Eocene of NW Transylvania. A new biochronostratigraphic zonation based on calcareous nannoplankton. Dari de Seama ale Sedintelor Institutul de Geologie si Geofizica 69: 95-106.
Holotype
Reticulofenestra primitiva
Gheta, 1982
Middle Eocene - Late Eocene
Transylvania Basin, Romania