Resumen

JIMENEZ-SANCHEZ, Andrea; SPJELDNAES, Nils  y  VILLAS, Enrique. Ashgill bryozoans from the Iberian Chains (NE Spain) and their contribution to the Late Ordovician biodiversity peak in North Gondwana. Ameghiniana [online]. 2007, vol.44, n.4, pp.681-696. ISSN 1851-8044.

In the lower-middle Ashgill Cystoid Limestone Formation of the Iberian Chains (NE Spain) twenty one bryozoan genera have been identified, which belong to the four Stenolaemata orders that were already spread worldwide by the Mid Ordovician: Cryptostomata, Cyclostomata, Cystoporata and Trepostomata. Five of them: Cyclophaenopora Spjeldnaes, Glauconomella Bassler, Orbignyella Ulrich and Bassler, Phaenopora Hall and Pseudostictoporella Ross have been identified here for the first time in the Mediterranean Province. This list increases the number of bryozoan genera known to sixty six, making it the most diversified group in the region for that period.

Palabras clave : Bryozoans; Cystoid Limestone; Late Ordovician; Iberian Chains; Mediterranean Province; Biodiversity.