Fig. 4. Tommotiid Camenella reticulosa Conway Morris, 1990 in The tommotiid Camenella reticulosa from the early Cambrian of South Australia: Morphology, scleritome reconstruction, and phylogeny

Fig. 4. Tommotiid Camenella reticulosa Conway Morris, 1990 from lower Cambrian Hawker Group, Flinders Ranges, Arrowie Basin, South Australia, mitral sclerites. A. SAMP 43170 (sinistral), Wilkawillina S; A1, apertural view of large specimen showing deep apertural cavity and angular deflection of radial ribs on plicate side which is developed into a lip projecting under the accrescent side (on left in the picture); A2, view from accrescent side showing strong curvature of the specimen and aperture; A3, apical view showing initial equal development of radial ribs on plicate and obplicate (lowermost in picture) sides, development of the plicate side into a projecting lip and faint co−marginal ornament on the internal surface of the sclerite; A4, detail of apex showing circular perforation (breakage?) and subdued ornament. B. SAMP 43171 (sinistral), MMF 0.0; B1, apertural view of specimen showing deep apertural cavity, deflection of radial ribs on plicate side and growth disturbances on plicate and obplicate sides following damage and/or growth retardation at 2/3 of final sclerite length; B2, detail of growth disturbances on internal surface of obplicate side; B3, detail apex showing smoothly rounded apex without perforations.