RT Journal Article T1 Enodicalix (Diploporita, Aristocystitidae): A new echinoderm genus from the Middle Ordovician of Spain A1 Paul, C.R.C. A1 Gutiérrez Marco, Juan Carlos AB Restudy of an Ordovician diploporite specimen from the Middle Ordovician of central Spain reveals that the species ‘Calix’ inornatus meléndez has four ambulacra, each with two equal facets, an oval hydropore and a smooth thecal surface. In contrast, the type species of Calix has four ambulacra, each with four facets added in a clockwise direction during growth, a trilobed hydropore, and a theca with spiny plates. Other aristocystitid genera with four ambulacra have one facet per ambulacrum. ‘Calix’ inornatus differs from all other aristocystitid genera and warrants a new generic name, for which we propose Enodicalix. PB Instituto de Ciencias de la Tierra "Jaume Almera" (Barcelona) SN 1695-6133 YR 2020 FD 2020 LK https://hdl.handle.net/20.500.14352/6825 UL https://hdl.handle.net/20.500.14352/6825 LA eng DS Docta Complutense RD 9 abr 2025