Noelaerhabdus bozinovicae Jerkovic, 1970
Optical Properties: Pelaga exhibits first-order white interference colours. Noelaerhabdus displays parallel extinction lines with an angle of 0°, showing length-fast (-) elongation.
When the distal process is viewed in a particular orientation under XPL, the optic axis is vertical relative to the microscope stage, causing the distal process to appear in constant extinction (dim) because it does not double-refract light in this orientation. However, when observed from a different profile, the distal process exhibits birefringence (leading interference colours), splitting incident light into two rays travelling at different velocities. During this observation, the distal process exhibits parallel extinction and the length-slow (+) elongation.
Elliptical placoliths are characterised by their single-tiered distal and proximal shields, a single tube cycle, a central area with a cover, and a distinct central process. Noelaerhabdus stands out from similar genera such as Reticulofenestra, Cyclicargolithus, and Dictyococcites by the presence of a distal process.
Jerkovic, L. 1970. Noëlaerhabdus nov. gen. type d'un nouvelle famille de Coccolithophoridés fossiles: Noëlaerhabdaceae du Miocène supérieur de Yugoslavie. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris, Série D - Sciences Naturelles 270: 468-470.