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turtle marginal?


M Harvey

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I came upon this bone while sorting my old boxes.  It looks like the dorsal edge of a turtle marginal.  I say this because of the slit on the inner surface resembles the split marginals make.    It is the surface pattern that puzzles me.  I am unfamiliar with the freshwater turtles from this area and hoping someone can identify this.

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I'm not sure that's turtle, awfully thick for a marginal and very unfamiliar pattern.  The picture of the end of it made me think fin, curious what the experts will say.

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I think its spine too of some type of fish but familiar with local species

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I hadn't thought of fish.   One end looks like a natural suture rather than a break.

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