Mesodouvillina Williams, 1950

Baliński, Andrzej, 2012, The brachiopod succession through the Silurian-Devonian boundary beds at Dnistrove, Podolia, Ukraine, Acta Palaeontologica Polonica 57 (4), pp. 897-924 : 903

Genus Mesodouvillina Williams, 1950

Type species: Stropheodonta (Brachyprion) subinterstrialis seretensis Kozłowski, 1929 ; Chortkiv Horizon ( Early Devonian ); Bogdanovka, Podolia ( Ukraine) .

? Mesodouvillina sp.

Fig. 4M .

Material.—One slightly incomplete ventral valve wit preserved exterior. Bed 102, 11 m above the S–D boundary.

Remarks.—A single, strongly exfoliated ventral valve was recovered from the upper part of the studied section. Unfortunately, its internal structure and details of shell ornamentation cannot be assessed, making generic determination of the specimen somewhat tentative.

Figures

Fig. 4. Strophomenide brachiopods from the Silurian–Devonian boundary beds at Dnistrove (Podolia, Ukraine). A–J, L. Leptaena (Leptaena) aff. altera Rybnikova, 1966. A, B. Two nearly complete shells, ZPAL Bp. 56/42 (A) and ZPAL Bp. 56/43 (B), in dorsal (A1, B1), ventral (A2, B2), lateral (A3, B3), posterior (A4, B4), and anterior (A5, B5) views. C. Shell ZPAL Bp. 56/46 in ventral view (C1) and enlargement showing the pedicle tube (C2). D. Enlargement of the posterior region of the ventral valve ZPAL Bp. 56/32d showing interarea, delthyrium, and well preserved teeth. E–G. Enlargement of the posterior region of three shells, ZPAL Bp. 56/32c (E), ZPAL Bp. 56/32b (F), and ZPAL Bp. 56/32a (G); ventral valves uppermost. H. Almost complete shell ZPAL Bp. 56/45 in ventral view. I. Enlargement of the interior of ventral valve ZPAL Bp. 56/32e. J. Ventral valve ZPAL Bp. 56/44 with partially shown interior in general (J1) and enlarged (J2) views. L. Interior of incomplete dorsal valve ZPAL Bp. 56/32f. K, N–O. Cymostrophia (Protocymostrophia) costatula (Barrande, 1847). K. Incomplete shell ZPAL Bp. 56/18 in dorsal (A1) and ventral (A2) views. N. Interior of dorsal valve ZPAL Bp. 56/21. O. Interior of an incomplete ventral valve ZPAL Bp. 56/19. P. Exterior of an incomplete ventral valve ZPAL Bp. 56/20. M.?Mesodouvillina sp.; exterior of ventral valve ZPAL Bp. 56/53. Beds 47–48 (A–L, N–P), 102 (M). Scale bars 2 mm.