Hook GIUS 4−577 Mrz./86/4, Late Givetian, Marzysz II/6.

Interradial plates of GIUS 4−584 Mrz./207b/6 from the Late Givetian sample Marzysz II/13; inner, lateral, outer and proximal view.

Diagnoza

Radial elements of the calcareous ring with a large, but not protruding, concavity for muscle insertion. On the inner edge of the distal part of the radials there are four distinct knobs, each pair separated by a concavity, giving the margin a wavy appearance. Sclerites are hooks with a perforated eye, its network is droplet-like in outline.

Porównanie

A. multiperforatum differs from other species of the genus by the presence of fine knobs along the imaginative line connecting the proximal processes and by details of the lateral surface connecting the particular elements.

Autekologia

Występowanie geograficzne

Błonia  Sierzawskie  near  Świętomarz,  Holy  Cross  Mountains, Poland; Mechernich-Keldernich, Rhenish Slate Mountains, Germany; Set B of Jaźwica, Holy Cross Mountains, Poland; the Massenkalk, Rothe quarry, Schladetal near Bergisch-Gladbach, Rhenish Slate Mountains, Germany; Outcrop I, trench II at Marzysz; set B of Posłowice; set C of Stokówka; set D  of Wietrznia II quarry, Kielce, Holy Cross Mountains, Poland.

Zasięg czasowy

Late  Eifelian to Mid Frasnian.

Materiały muzealne

GIUS 6005 specimens.

Literatura

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