Cyrtina praecedens Kozłowski, 1929

Baliński, Andrzej, 2012, The brachiopod succession through the Silurian-Devonian boundary beds at Dnistrove, Podolia, Ukraine, Acta Palaeontologica Polonica 57 (4), pp. 897-924 : 922

Cyrtina praecedens Kozłowski, 1929

Fig. 20B, C .

1929 Cyrtina praecedens sp. n.; Kozłowski 1929: 207–211, pl. 11: 8–23; figs. 68, 70–75.

1985 Cyrtina praecedens Kozłowski, 1929 ; Nikiforova et al. 1985: 52–53, pl. 12: 3, 4 [full synonymy herein].

Material.—One complete but superficially corroded shell and one incomplete ventral valve, both from beds 47–48 (5.5 m above the S–D boundary) of the studied section at Dnistrove. Remarks.—The species, as well as its variability, was described in great detail by Kozłowski (1929). More recently, Nikiforova et al. (1985) selected the neotype of the species from the Mytkiv Beds of Verkhnyakovtsy. The present material, although rather scanty, closely corresponds externally to Cyrtina praecedens . The studied specimens show clear punctation of the shell substance, pustulose microornamentaion, and presence of tichorhinum in the ventral valve.

Stratigraphic and geographic range.—According to Nikiforova et al. (1985), C. praecedens is one of the most common and characteristic species of the Borshchiv Horizon. It appears in the Khudykivtsi Beds but becomes especially common in the Mytkiv Beds. Savage (1969: 483–486, pl. 92: 1–44) described C. praecedens from the Lower Devonian (Siegenian) Mandagery Park Gormation of New South Wales and Drot (1964: 91) reported? Cyrtina praecedens from the Gedinnian of Morocco.

Figures

Fig. 20. Spiriferide brachiopods from the Silurian–Devonian boundary beds at Dnistrove (Podolia, Ukraine). A. Howellella (Howellella) latisinuata Kozłowski, 1929; shell ZPAL Bp. 56/26 in dorsal (A1), ventral (A2), lateral (A3), posterior (A4), and anterior (A5) views. B, C. Cyrtina praecedens Kozłowski, 1929. B. Slightly damaged shell ZPAL Bp. 56/37 in dorsal (B1), ventral (B2), lateral (B3), posterior (B4), and anterior (B5) views. C. Incomplete ventral valve ZPAL Bp. 56/36 in ventral (C1) and posterior (C2) views. Dnistrove, beds 47–48. Scale bars 5 mm.