Arkhangelskiella soyhaniorum
Arkhangelskiella soyhaniorum Varol, in prep.
Large [6.5µm-11.0µm] species of Arkhangelskiella having a width of the pelaga narrower than 1.50µm. The central area appears as a large, finely perforated axial cross due to the four “tooth” like projections at the inner margin of the pelaga.
After Osman Soyhan (Petroleum System Analyst in Saudi Arabia) and Nurgul Soyhan (Petrophysisist, United Kingdom)
This large species has at least twenty fine pores in each quadrant of the central plate but is only visible in well-preserved specimens. Its length ranges between 6.5µm and 11.0µm, and its width of the shields is narrower than 1.5µm. The essential characteristics of this species are the four “tooth” like projections at the inner margin of the pelaga. Because of these “tooth” like projections, the central plate appears as a large, finely perforated axial cross. The central plate is relatively darker due to the presence of many fine pores. The axial suture is often not distinct under bright field and phase contrast.
Arkhangelskiella soyhaniorum is distinguished from Arkhangelskiella umbracrucis by being less than 11.0µm in length, having shields narrower than 1.50µm, and having a finer and greater number of pores [>20 pores per quadrant] in the central plate. The latter is larger than 11µm; its width of the shields ranges between 1.5µm and 2.0µm and has fewer pores per quadrant [8-12 pores].
Holotype
Arkhangelskiella soyhaniorum
Varol, in prep.
Middle Campanian
Unknown