Fig. 3 in Palaeobiology of orthothecide hyoliths from the Cambrian Manto Formation of Hebei Province, North China

Fig. 3. Novitatid hyolith Decoritheca cyrene (Walcott, 1905) from the Manto Formation (Cambrian Stage 4/5) in the Zuojiawu section of Tangshan, China. A. NIGPAS 166338 in dorsal view. B. NIGPAS 166335 in ventral (B1) and ventro-lateral (B3) views; detail showing transverse lines on the external surface of venter (B2). C. NIGPAS 166337 in dorsal view, conch of Decoritheca cyrene with operculum of Cupitheca convexa sp. nov. in apertural region (C1); rows of tubercles (C2), inset shows enlarged individual tubercle with nearly flat top. D. NIGPAS 166329 in ventral view. E. NIGPAS 166341b, aperture with reniform cross section. F. NIGPAS 166331 in ventral view; F1, incomplete shell showing well developed median concavity and adjacent ridges; F2, nearly complete shell with broken aperture and adapically shallowing median concavity. G. NIGPAS 166330, both shells display partial venter and partial dorsum from dorsal view. H. NIGPAS 166333 in ventral view. I. NIGPAS 166332 in dorsal view, white arrows indicate algae. Scale bars: A, D, B3, F–I, 2 mm; B1, C1, 1 mm; B2, 100 μm; C2, 20 μm; E, 200 μm.