The Echinoid Directory

• Test shape unknown; plating weakly imbricate.
• Apical disc unknown.
• Ambulacra more or less straight and narrow; biserial. Plating simple with pore-pair on each plate. Internal perradial flanges cover the radial water vessel completely.
• Interambulacral zones wide; composed of many columns of plates in type species.
• Perforate primary tubercle on plates of adambital columns of interambulacral plates only; other plates without primary tubercles.
• Peristome, lantern and spines all unknown.

Carboniferous, Belgium; ?Silurian, North America.

Koninckocidaris cotteaui Dollo & Buisseret, 1888, p. 959, by subsequent designation of Lambert & Thiery, 1911, p. 122.

• K. cotteaui Dollo & Buisseret, 1888; ?Carboniferous, Belgium.
• ?K. silurica Jackson, 1912; Upper Silurian, New York, USA.

Stem group Echinoidea; Lepidocentridae.

Nomen dubium.

The type species has never been figured and its provenance is simply stated as Carboniferous Limestone of Belgium. The description is based on a single fragment of test with part of one ambulacrum and 7 columns of interambulacral plates. From this description it could be from the upper surface of a test of Perischodomus.

Jackson (1912) assigned an Upper Silurian specimen from the USA to this genus. His new species is based on another fragment of test, exposing the inner surface. This is clearly a lepidocentrid species and it is highly doubtful whether it has any close relationship to Dollo & Buisseret\'s species.

So little is known about both species that the genus is best treated as a nomen dubium.

Dollo, L, & Buisseret, A. 1888. Sur quelques Palechinides. C. R. Acad. Sci. Paris 106, p. 959.
 

Jackson, R. T. 1912. Phylogeny of the Echini, with a revision of Palaeozoic species Memoirs of the Boston Society of Natural History 7, 491 pp. 76 pls.

Jackson, R. T. 1929. Palaeozoic Echini of Belgium. Memoires du Musee Royal d\'Histoire Naturelle de Belgique 38, 1-96.