Diagnoza

Shell rather small, slightly to markedly transverse, ventribiconvex; maximal width at 2/3 - 4/5 of the length, maximal thickness in the posterior region; dorsal valve convex, with sulcus appearing near the umbo, very narrow and slit-like posteriorly, gradually broadening towards the anterior commissure; dorsal umbo fine and delicate, incurved; ventral valve pyramidal, distinctly triangular in anterior view; ornamentation of thin radial costae and costellae, those in the centre of each valve straight, the lateral ones bending abaxially, separated by wider furrows.

Porównanie

This is one of the characteristic though not abundant forms in the Givetian beds of the Holy Cross Mountains; German specimens are with a slightly lower ventral interarea, and a somewhat smaller ventral beak.

Autekologia

Występowanie geograficzne

Germany (Eifel, Gerolstein) and Poland (Holy Cross Mountains).

Zasięg czasowy

Mid Devonian, Late Eifelian to Givetian.

Materiały muzealne

80 articulated shells and 39 isolated valves from outcrop SK-3 at Skały, (ZPAL Bp IV; L PZ-D.559, olim 773; MGUWr 1963s, 1972s);  Gurich's material; 10 shells from the Eifel region (Kayser's collection), MB.B.2408.1-1 0.

Literatura

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.

Kayser, E. 1871. Die Brachiopoden des Mittel- und Ober-Devon der Eifel. Z. deutsch. geol. Ges. 23: 491-647, Pls 9-14; Berlin.

Sobolew, 1904a. Devonskia otlozenia profila Grzegorzevice-Skaly-Vloxi. Izv. Varsav. Politex. Inst. 1904: 1-107, Pls 1-9, map; Varsava.

Sobolew, D. 1909. Sredniy devon Kelecko-Sandomirskago Krah. Mat. geol. Ross. 24: 43-536, Plates 2-6; St. Petersburg, Moskva.