Goniodont (holotype) GIUS 4−584 Mrz./244/3 from the Late Givetian of Marzysz, Holy Cross Mountains; samples Marzysz II/13; outer view

Diagnoza

Heart−shaped goniodonts with strongly incised distal margin, margins straight; narrowed, rounded corners. Hubs in shape of a star, narrow, thin and flat. The arches of the central cross thin, oval in section and intersect perpendicularly, to forming a short common bar separating the four central pores where they intersect. There are eight pores of more or less triangular outline (occasionally fully oval), separated by flat spokes in the marginal zone. These pores are significantly larger than those of the central zone.

Porównanie

This species is possibly derived from Microantyx praedulcis. One can observe a decrease in pore number in the marginal zone, from ten (M. praedulcis) to eight (P. dulcis). The central pores are centred opposite to marginal pore centres, whereas in M. praedulcis they are placed opposite to spokes. Juvenile specimens are very similar to those of Erisserra romaneki, as they are heart−shaped.

Autekologia

Występowanie geograficzne

Set B of Jaźwica; outcrop I, trench II at Marzysz andSet B of Posłowice, Holy Cross Mountains, Poland. 

Zasięg czasowy

Middle and Late Givetian. 

Materiały muzealne

Holotype: GIUS 4−584 Mrz./244/3 and and ca. 1373 specimens.

Literatura

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