Genus Coniscala Boury, 1887

Type species. Scalaria angarensis Ryckholt, 1854 (type by original designation). Paleocene, Belgium.

Remarks. The sharp costae used as a diagnostic feature by Wenz (1940: p. 802) are not always present as illustrated by the Middle Danian C. faxensis Ravn, 1933 and the Selandian C. johnstrupi (Mørch, 1874), both from Denmark. The former has broad, rounded transverse ribs, while the latter features both rounded ribs and more costae-like ribs. The species are in all other regards typical members of this genus and the presence or absence of costae should thus only be used as a general diagnostic feature.