Polypodorhabdus escaigii Noël, 1965
The placolith comprises a cretarhabdid pelaga sloping towards the central area, formed of inclined segments that are usually weakly clockwise-imbricated, but rarely non-imbricate, and a distally arched central area characterised by an axial cross supporting a solid distal process.
The intercross area is occupied by lateral bars that delimit elongated slits arranged in a single cycle. The number of lateral bars is typically 4-32, a characteristic feature of Polypodorhabdus.
The placolith generally displays first-order, greyish-white interference colours; however, it rarely becomes dimmer towards the periphery, where only the inner layer of the distal shield is developed. In plan view under crossed polars, the pelaga exhibits inclined extinction and length-fast (–) elongation.
Black, M. 1971a. Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society 38: 381-424.
Noël, D. 1965. Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-129.
Noël, D. 1970. Coccolithes Crétacés: La Craie Campanienne du Bassin de Paris. - Éditions du Centre National de la Recherche Scientifique, Paris. 1-129