Holotype marginal ossicle GIUS 4−564 Mrz./489/1 from the late Givetian of Marzysz II/W/2; ventral, lateral, dorsal, distal face and proximal face view

Diagnoza

Marginals with large, sharply terminated wings. Apertures of facet canals on the ventral side are well marked and open into a distinct central depression of the crown with few pores.

Porównanie

This species of Concavocycloides differs from the other species by the sculpture of its dorsal surface, its sharply terminated wings, the presence of strong  lateral  striae  on  the  crest  and  its  spool−shaped  crest.  It  differs  from Neocyclocystoides  neocyclocystoides in the shape of its marginal plates and the lack of sculpture on its crest.

Autekologia

Występowanie geograficzne

Set B of Jaźwica; outcrop I, trench II at Marzysz; Set C of Sowie Górki, Holy Cross Mountains, Poland.

Zasięg czasowy

Middle Givetian and Late Givetian.

Materiały muzealne

Holotype: GIUS 4−564 Mrz./489/1 and 267 specimens.

Literatura

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