Fig. 5 in The tarphyceratid cephalopod Trocholites in the Middle-Upper Ordovician of the Prague Basin -the Baltican element in peri-Gondwana

Fig. 5. Tarphyceratid cephalopod Trocholites chaloupkai sp. nov. from Praha-Štěrboholy, central Bohemia, Czech Republic, upper part of the Zahořany Formation (lower Katian, Upper Ordovician). Holotype NM L 63626, optical microscope photograph of whitened specimen in lateral view (A1); micro-CT images showing frontal (A2) and ventral (A3) views, note ventral lobe of suture line; virtual longitudinal sections in sagittal plane showing partly preserved septa in last (A4) and penultimate (A7) whorls; virtual longitudinal section in median plane (A8) showing the siphuncle and the earliest whorl of the phragmocone; virtual transverse sections in slightly eccentric (A5) and central (A6) planes documenting whorl profile shape and siphuncle.