Part & Counterpart

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Two halves of a split rock show two sides of the same fossil — the part and counterpart — of Diplurus newarki, a Late Triassic coelacanth fish from New Jersey. This fossil represents a number of different individuals. Image credit: Yale Peabody Museum / Curious Sengi.

 

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The tail of one Diplurus arching towards the left. The faint impression of scales are also present. Image credit: Yale Peabody Museum / Curious Sengi.

 

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An even closer detail of the tail fin shows the individual little bones that make up the fin rays. Image credit: Yale Peabody Museum / Curious Sengi.

 

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Detail of the trunk skeleton shows, among other things, distinctive “Y” shaped bones. These are either neural or haemal arches.  The neural cord (in neural arches) or the major blood vessels running the length of the body (in haemal arches) thread through this protective arcade of bone like a thread through a needle’s eye.  Image credit: Yale Peabody Museum / Curious Sengi.

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