Exceptional preservation of nerve and muscle tissues in Late Devonian placoderm fish and their evolutionary implications
In this paper, we show exceptional three-dimensionally preserved fossilized muscle tissues in 380-384Myr old placoderm fish (Late Devonian), offering new morphological evidence supporting the hypothesis that placoderms are the sister group to all other gnathostomes. We describe the oldest soft tissue discovered in gnathostomes, which includes striated muscle fibres, circulatory and nerve tissues, preserved as phosphatized structures precipitated by microbial infilling of small, protected areas...[Show more]
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