Articulated shell of specimen ZPAL Bp. 48/26/1/3 from outcrop SK-3 in ventral and dorsal views.

Diagnoza

Shell medium-sized to large, moderately transverse, usually aequibiconvex with straight posterior margin and rounded postero-lateral and antero-lateral extremities; maximal width at midlength or towards the anterior margin; maximal thickness in the posterior region; anterior commissure approximately rectimarginate; dorsal valve with very shallow sulcus beginning at the umbo and gradually widening anteriorly; ornamentation of radial costellae, the medium ones straight, the lateral ones bending abaxially; costellae originating by bifurcation at all levels, then gradually thickening.

Porównanie

Differences between material of Sobolew (1909) and Halamski (2009) apparently result from intraspecific variability.

Autekologia

Występowanie geograficzne

Świętomarz (Holy Cross Mts.), Poland.

Zasięg czasowy

Mid Devonian, Early Givetian.

Materiały muzealne

10 shells, 5 isolated dorsal valves and 2 ventral valves; several fragments (ZPAL Bp 48/26/1).

Literatura

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.

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