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Plagiolaria nandanensis est un fossile-index de zone de trilobites du Dévonien inférieur de Nandan, Guangxi, Chine. Les strates de cet âge contiennent de nombreuses exuvies de trilobites. Celles-ci montrent que, chez P. nandanensis, la déchirure de la carapace dorsale débutait par la séparation du thorax et du céphalon; abandonnant l'hypostome, l'animal rampait vers l'avant, soulevant puis renversant...
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