Ethmorhabdus camaratus Bukry, 1969
The placolith comprises a cretarhabdid pelaga sloping towards the central area, formed of inclined segments that are weakly clockwise-imbricated in most specimens, and a distally arched central area characterised by an axial cross supporting a solid distal process.
The inter-cross area is occupied by numerous pentagonal pores arranged in concentric cycles.
The entire placolith exhibits first-order, greyish-white interference colours. The pelaga of Ralphsalomonia displays inclined extinction and length-fast (-) elongation in plan view under crossed polars.
Bukry, D. 1969. Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles 51 (Protista 2): 1-79.