Fig. 23 in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)

Fig. 23. Comparison of the coiled parts of species of Ancistroceras Boll, 1857 from the Upper Grey Orthoceratite Limestone. A. Ancistroceras barrandei Dewitz, 1880, specimen MB.C.30518 (Neben & Krueger Coll.) from Rerik (Ostsee). B. Ancistroceras barrandei Dewitz, 1880, specimen MB.C.30516 (Neben & Krueger Coll.) from Rerik (Ostsee). C. Ancistroceras barrandei Dewitz, 1880, specimen MB.C.11991 (Helms 1966 Coll.) from Gross Zicker (Island of Rügen). D. Ancistroceras torelli (Remelé, 1881), lectotype MB.C.22575 from Heegermühle (Brandenburg). E. Ancistroceras torelli (Remelé, 1881), specimen MB.C.30519 (Neben & Krueger Coll.) from Schmetzdorf (Brandenburg). Scale bar units = 1 mm.