Figure 3.4   Exceptional preservation of muscle in the Jurassic horseshoe crab Mesolimulus walchi: (a) the whole specimen showing the rounded headshield (prosoma), with preserved muscle tissues in the middle; (b) muscle fi bers; (c) banding across muscle fi bers revealed by early decay; and (d) small coccoid microbes associated with the muscle fi bers. Scale bars: 20 mm (a), 50 Ám (b), 10 Ám (c, d). (Courtesy of Derek Briggs.)

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