The aim of this paper is to describe the chitinozoans from the Climacograptus prominens elongatus Zone from the upper part of the Vaureal Formation (Upper Ordovician) of Anticosti Island. An emendation of the genus Hercochitina is proposed. Seven new species, Hercochitina normalis, H. minuta, H. filamentosa, H. grandispina, Conochitina baculata, C. armifera, and Ancyrochitina spongiosa are described.The microfauna characterized by the dominance of Hercochitina, is distinctive and does not resemble those reported from elsewhere.

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