Figure 14.14   Pathological trilobites: (a) Onnia superba the fringe in the lower part of the photograph has an indentation and a smooth area, probably regeneration following an injury during molting (4); (b) Autoloxolichas the deformed segments on the left-hand side may be either genetic or the result of repair following injury (3); and (c) Sphaerexochus only two ribs are developed on the right-hand side, probably a genetic abnormality (25). (Courtesy of Alan Owen.)

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