Subulitoidea Lindström, 1884

Jagt-Yazykova, Elena, Krawczyński, Wojciech & Rakociński, Michał, 2006, Molluscs from the Early Frasnian Goniatite Level at Kostomłoty in the Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 51 (4), pp. 707-718 : 715

Superfamily Subulitoidea Lindström, 1884

Subulitidae indet. ( Fig. 5D ).—Two pyritised internal moulds with preserved protoconchs have been collected. Subulate shell with partially preserved growth lines and characteristic non−archaeogastropod protoconch, openly coiled in the earliest ontogenetic stages, suggests that these belong to family Subulitidae Lindström, 1884 (see Frýda and Bandel 1997; Frýda and Manda 1997). A more precise identification is not possible because of the absence of diagnostic features. Representatives of subulitids are common in the various facies of Givetian and Frasnian age in the Holy Cross Mountains, where they have been reported from open−shelf settings (Jaźwica Member, Late Givetian; see Racki 1988) as well as from reef facies (upper Szydłówek Beds, Early Frasnian; see Krawczyński 1998). Specimens preserving their protoconchs are known only from the Goniatite Level at Kostomłoty.

Figures

Fig. 5. Gastropods from the Early Frasnian Goniatite Level (uppermost Szydłówek Beds) at Kostomłoty, Holy Cross Mountains, Poland. A–C. Lahnospira taeniata (Sandberger, 1842). A. GIUS 4−2282 Kos−12 in apertural view. B, C. GIUS 4−2276 Kos−6 (B) and GIUS 4−2277 Kos−7 (C) in lateral views. D. Subulitidae indet., GIUS 4−2289 Kos−19, in apertural (D1) and lateral (D2) views, with protoconch visible. E, K. Naticopsis aff. N. kayseri Holzapfel, 1895. E. GIUS 4−1164 Kos−2 in pertural (E1), lateral (E2), and apical (E3) views and cycloneritid−type protoconch (E4). K. GIUS 4−2288 Kos−18 in apertural (K1) and lateral (K2) views. F–J. Palaeozygopleura (Bohemozyga) pyritica sp. nov. H. GIUS 4−2284 Kos−14 in apertural (H1) and lateral (H2) views of holotype. F, G, I. GIUS 4−2287 Kos−17 (F). GIUS 4−2285 Kos−15/1 (G), and GIUS 4−2286 Kos−16 (I), lateral views with opisthoclinal ornamentation visible. J. GIUS 4−2285 Kos−15/1, apertural view of shell fragment.