Fig. 8 in Palaeobiology of orthothecide hyoliths from the Cambrian Manto Formation of Hebei Province, North China

Fig. 8. Internal mould of the conch of cupithecid hyolith Cupitheca convexa sp. nov. (NIGPAS 166334) from the Manto Formation (Cambrian Stage 4/5) in the Zuojiawu section of Tangshan, China. A. General view. B. Boundary between presumed protoconch and the rest of the shell. C. Transverse lines preserved on the surface of the conch. D. Conch covered with longitudinal to sub-radial ornament and mechanical compression forming a transverse ridge-like structure. E. Apical portion. F. Lamellar-fibrillar structure (indicated by white arrow in A). Scale bars: A, E, 200 μm; B, 20 μm; C, 2 μm; D, 50 μm; F, 5 μm.