Tetractinella trigonella

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Tetractinella trigonella

brachiopod

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homeomorphy

In Tetractinella
Tetractinella trigonella, a Middle Triassic species from Italy, is remarkably similar to the unrelated Cheirothyris fleuriausa, from the Late Jurassic (about 150 million years ago) marine rocks of Germany. The two forms are separated by a great geographic distance and by a large span of…
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