Howellella (Howellella) Kozłowski, 1946

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

Subgenus Howellella (Howellella) Kozłowski, 1946 Type species: Delthyris elegans Muir−Wood, 1923 ; Mulde Formation, Wenlock, Silurian; Gotland, Sweden.

Howellella (Howellella) latisinuata Kozłowski, 1929 Fig. 20A .

1929 Spirifer (? Crispella ) latisinuaus sp. n.; Kozłowski 1929: 197, pl. 11: 1–7.

1985 Howellella latisinuata ( Kozłowski, 1929) ; Nikiforova et al. 1985: 48, pl. 13: 1–3.

Material.—Four complete shells and 37 fragments of shells and single valves embedded in rock. The specimens were recovered from several beds in the interval extending from 0.2 m below the S–D boundary (bed −10) up to 12.3 m above the boundary (bed 115).

Remarks.—Fragmentary material from Dnistrove conforms with this species, which was described from the basal part of the Borshchiv Horizon ( Kozłowski 1929: 197–198, pl. 11: 1–7; Nikiforova et al. 1985: 48, pl. 13: 1–3), in having a small shell and very few, weak radial plications. The largest complete shell in the present material (see Fig. 20A ) measures 8.2 mm in length and 10.7 mm in width. Nikiforova et al. (1985) designated the neotype of the species from the Khudykivtsi Beds exposed at Olkhovtsy village (about 8 km

NW from Dnistrove). Stratigraphic and geographic range.— Nikiforova et al.

(1985: 48) confirmed that the species is confined to the Khudykivtsi Beds (former Tajna Beds).

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.