Orastrum perspicuum Varol in Al-Rifaiy et al., 1990
From Greek en, in, within, aplax / haplous, single, simple and lithos, stone, referring to the simple construction comprising a single central plate enclosed by a surrounding wall.
Planar holococcoliths composed of a single, dim central plate surrounded by a bright peripheral wall under crossed polars
Al-Rifaiy, I., Varol, O. & Lemone, D. 1990. Middle to late Albian biostratigraphy of the Cuchillo Formation from Sierra de Sapellò, Mexico. Newsletters on Stratigraphy. 21: 187-200.