Holotype marginal ossicle GIUS 4−648 Ska./848/1 from the Late Eifelian set XVII of Skały; ventral, dorsal and distal face view.

Diagnoza

Marginals with weakly marked facet canal openings and with indistinct winglets. Crown not developed; in place of a central depression there is a single, large opening at the centre.

Porównanie

This is the oldest species of Concavocycloides and still strongly resembles Sievertsia. Absence of a crown is a primitive character.

Autekologia

Występowanie geograficzne

Only known from the type locality.

Zasięg czasowy

Late Eifelian, Set XVII of the Skały Beds, Tortodus kockelianus Zone.

Materiały muzealne

Holotype GIUS 4−648 Ska./848/1 and 6 specimens.

Literatura

Boczarowski, A. 2001. Isolated sclerites of Devonian non-pelmatozoan echinoderms. Palaeontologia Polonica 59: 3-220.