Sur les familles des Helicancylidae Hyatt, 1894 et des Acrioceratidae Vermeulen, 2004 ; reponses et precisions apportees au travail de Bert, 2009

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Sur les familles des Helicancylidae Hyatt, 1894 et des Acrioceratidae Vermeulen, 2004 ; reponses et precisions apportees au travail de Bert, 2009

Vermeulen, Jean

Annales de paléontologie (1982), 06/2010, Volume: 96, Issue: 2

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This work is mainly an answer to the work of , on families Helicancylidae Hyatt, 1894 and Acrioceratidae Vermeulen, 2009. On the nomenclatural speaking, the non validity of the genus Helicancylus Gabb, 1869 and of the family Helicancylidae Hyatt, 1894 and, consequently, the validity of the family Acrioceratidae Vermeulen, 2004 are established. The second part of this work is devoted to the respect of former work and, contrary to the assertions from , it is shown that the stratigraphical positioning of the Upper Barremian level with small Barremites, realized by , is at least as precise as that proposed by Bert. The last part of this work highlights a lack of bibliographical references, fact which had already been highlighted () in a former work of .

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