Micula decussata Vekshina, 1959
Cuboid calcareous nannofossils exhibit sutures delineating blocks resembling a cobbler’s anvil, best observed under a scanning electron microscope, and feature a small central cross. The blocks of Micula display parallel extinctions with length-fast (-) elongation.
Micula differs from Bowmania in that its blocks have length-fast (-) elongation, while Bowmania has blocks with length-slow (+) elongation.
Vekshina, V. N. 1959. Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Trudyi Instituta Geologii i Geogiziki, Sibiriskoe Otlodelenie, Akademiya Nauk SSSR (Nauka) Moscow 2:56-81.