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Fig. 4. A, B. Parkula bounites Bengtson, 1990a. A. MGUH 27092 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland

Fig. 4. A, B. Parkula bounites Bengtson, 1990a. A. MGUH 27092; A1, exterior of operculum from above; A2, lateral view of operculum with conical shield to right. B. MGUH 27093, interior of operculum with cardinal processes and clavicles (top of the picture). C, D. Parkula? sp. C. MGUH ZZZ13; C1, exterior of operculum from above; C2, view from cardinal shield showing enlarged cardinal processes. D. MGUH 27095; D1, exterior of operculum from above; D2, lateral view of operculum with conical shield to right; D3, view from cardinal shield showing enlarged cardinal processes. E–I. Hyptiotheca karraculum Bengtson, 1990a. E. MGUH 27096; E1, exterior of operculum from above; E2, lateral view with conical shield to right, showing no change in angle between conical and cardinal shields; E3, view from edge of conical shield. F. MGUH 27097; F1, oblique view from above of exterior of operculum from above; F2, view from edge of conical shield; F3, exterior of operculum from above. G. MGUH 27098; G1, oblique view from above of exterior of operculum from above; G2, lateral view of operculum with conical shield to right, showing abrupt change in angle between cardinal and conical shields. H. MGUH 27099; H1, lateral view of operculum with conical shield to right, showing abrupt change in angle between cardinal and conical shield; H2, exterior of operculum from above. I. MGUH 27100, interior view showing weakly developed depressions along edges only, corresponding to rooflets on exterior. All from GGU sample 314835. Scale bars 0.2 mm.