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Des representants du genre Hemidiadema Agassiz, 1846, provenant de l'Aptien (Cretace inferieur) d'Espagne – plus precisement des provinces de Castellon, de Tarragone, de Barcelone et de Teruel – sont etudies. Tous les individus d'Hemidiadema jusqu'a present cites ou figures provenant de ces regions avaient ete rapportes a l'espece Hemidiadema rugosum Agassiz, 1846. Leur revision taxonomique – basee sur le materiel historique et de nouvelles recoltes – demontre que ces individus n'appartiennent pas a l'espece decrite par Agassiz. Trois nouvelles especes sont ainsi proposees et decrites : Hemidiadema batalleri nov. sp., H. malladai nov. sp. et H. forcallensis nov. sp. L'espece H. rugosum Agassiz, 1846, n'est connue que par un unique exemplaire provenant de l'Aptien de Castellon. Des remarques sur la paleoecologie et les repartitions geographique et stratigraphique des differentes especes decrites sont egalement formulees. [A review of the species of the genus Hemidiadema Agassiz, 1846 (Euechinoidea, Camaradonta, Glyphocyphidae), from the Aptian (Lower Cretaceous) of Spain.- Specimens belonging to the genus Hemidiadema Agassiz, 1846, from Aptian (Lower Cretaceous) strata from the Spanish provinces of Castellon, Tarragona, Barcelona and Teruel –were studied. All specimens of Hemidiadema from these regions cited or described in the literature until now were related to the species Hemidiadema rugosum Agassiz, 1846. Their taxonomic revision – based on historical material and new collecting – demonstrates that these individuals do not belong to the species described by Agassiz, but represent new taxa. Three new species are proposed and described: Hemidiadema batalleri nov. sp., H. malladai nov. sp., and H. forcallensis nov. sp). The species H. rugosum Agassiz, 1846, is known by a single specimen from the Aptian of Castellon. Remarks on the paleoecology and stratigraphic and geographic distributions of these species are given.]

Révision des espèces du genre Hemidiadema Agassiz, 1846 (Euechinoidea, Camaradonta, Glyphocyphidae), de l'Aptien (Crétacé inférieur) d'Espagne