Diagnoza

Shell small to rather small slightly to distinctly transverse (exceptionally longer than wide), ventribiconvex, aequibiconvex or dorsibiconvex; outline rounded, postero-lateral extremities markedly rounded; maximal shell width at 3/4 of its length, maximal thickness in the posterior region;  dorsal valve convex, parabolic in anterior view, with very shallow sulcus; ventral valve markedly convex in the umbonal region, lateral slopes convex, somewhat depressed in antero-median region;  ornamentation of rounded radial costellae, the median ones straight, the lateral ones bending abaxially, separated by wider furrows, new costellae originating by both intercalation and bifurcation, 3-4 per mm.

Porównanie

Highly variability – e.g. specimens from Gerolstein (Eifel Mts.) are more finely costate; in the Łysogóry Region, Givetian specimens often have larger interareas; rare very large shells in various localization.

Autekologia

Występowanie geograficzne

Poland (outcrop SK-3 at Skaly, SW-2 at Blonia Sierzawskie, SW-4 in Sierzawy and C-1 in Czątstków), Germany (Rhenish Slate Mountains), Spain, Belgium, Myanmar, Iran (Brice et al. 1971) and Russia (Urals, Nalivkin, 1951).

Zasięg czasowy

Mid Devonian, Late Eifelian to Late Givetian.

Materiały muzealne

Thousands specimens from Poland (ZPAL), Germany, Russia, Spain, Belgium, Myanmar and Iran.

Literatura

Brice, D., Lafuste, J., De Lapparent, A. F., Pillet, J. & Yassini, I. 1977. Etude de deux gisements paleozolques (Silurien et Devonien) de l'Elbourz oriental (Iran). Ann. Soc. geol. Nord 93: 177-218, Pls 20-25; Lille.

Gurich, G. 1896. Das Palaeozoicum im polnischen Mittelgebirge.- Verh. Russ.-Kais. Min. Ges. St.-Petersb. (2) 32: 1-539, Plates 1-15, map; St-Petersburg.

Halamski, A.T. 2009. Middle Devonian Brachiopods from the northern Part of the Holy Cross Mountains, Poland in relation to selected coeval faunas. Part One: Introduction, Lingulida, Craniida, Strophomenida, Productida, Protorthida, Orthida. Palaeontographica Abteilung A, 287: 41-98.

Nalivkin, D.V. 1930. Brachiopods from the upper and middle Devonian of the Turkestan. Mem. Corn. Geol, N. S. 180: 1-221, Pls 1- 10; Moskva-Leningrad.

Schnur, J. 1851. Die Brachiopoden aus dem Uebergangsgebirge der Eifel. Progr. verein. hoh. Biirg. u. Prov.-Gewerbeschule Trier, Schuljahr 1850-1851, 16 pp., Fr. Lintz; Trier.

Vernuil, E. de 1850. Note sur les fossiles devoniens du district de Sabero (Leon). Bull. Soc. geol. Fr. 7 (2): 155-186, Pls 3-5; Paris.