Fig. 1

Early juvenile specimen of Peismoceras scharyi sp. nov., MCZ 165412 (figured by Barrande 1877, pl. 511, figs. 11–14), Wenlock, Homerian, P. parvus Biozone, Motol Formation, Beroun, Kozel locality; right lateral (a), dorsal (b), ventral (c) and left lateral views (d), detail of apex (e, f, i, j) and dorsal part of the apex (g, h). Dotted lines in j indicate cicatrix area with central bar inside. Scale bars: 5 mm (a–d), 2 mm (g, h), 1 mm (e, f, i, j). ap aperture, all appearance of longitudinal lirae, bsc breaks in shell curvature, c constriction, cb central bar, arrow indicates centre of the central bar; ci cicatrix, arrows indicate margin of the cicatrix area, d depression in cicatrix area, e end of embryonic shell indicated by change in sculpture and appearance of the first rib, f flexure in longitudinal lirae near apex, gcb groove bordering central bar, r rib, re rapidly expanding apical part of the shell, rs reticulate sculpture, vl ventral lobe of ridges/ribs (hyponomic sinus)