Ambulacral plate of holotype GIUS 4−439 Śni./920/1 from the middle part of the arm; Early Givetian of outcrop III at Śniadka; dorsal, ventral, lateral, distal and proximal view.

Diagnoza

On the lateral surface of the ambulacral plate there are two ridges, flanking the strongly expanded articular parts on both sides. 

Porównanie

The Early Devonian E. primigenius has less complicated lateral plates, the articulation surfaces of its ambulacral plates are not so strongly expanded beyond the lateral ridges nor so strongly developed, and the oral notch on its vertebra is broader. 

Autekologia

Występowanie geograficzne

Outcrop III at Śniadka; Set XXV of the Skały Beds at Skały, Holy Cross Mountains, Poland.

Zasięg czasowy

Early Givetian.

Materiały muzealne

Holotyp GIUS 4−439 Śni./920/1 and 9 specimens (ambulacral and lateral plates).

Literatura

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