Distinguished from all other Palaeozoic echinoids by its distinctive pore morphology. No other echinoid has ambulacral pores that comprise an oval area bounding some 12 small pores. Although MacBride & Spencer (1938) proposed this to be a holothurian, it seems to have more similarity to other primitive echinoids such as Aulechinus.
MacBride, E. W. & Spencer, W. K. 1938. Two new Echinoidea, Aulechinus and Ectinechinus, and an adult plated holothurian, Eothuria, from the Upper Ordovician of Girvan, Scotland. Transactions of the Royal Society, London B229, 91-136, pls 10-17.