Fig. 33 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden

Fig. 33. Morphological variation in Discoceras roemeri Strand, 1934. Black dots = specimens of the Boda Limestone. Black dot with grey margin = Rectanguloceras balaschovi Stumbur, 1962. Grey dots = Lituites antiquissimus of Roemer (1861: pl. 6, figs 2a-e). Grey dot with black margin = Discoceras roemeri of Dzik (1984: pl. 6, figs 5,6). White dot with black circle = Discoceras roemeri of Strand (1934: pl. 5, fig. 1). WER = whorl expansion rate.