doi:10.4202/app.2012.0069engMoreno-Azanza, M.Canudo, J.I.Gasca, J.M.Unusual theropod eggshells from the early cretaceous blesa formation of the Iberian Range, SpainART-2015-89289Trigonoolithus amoae oogen. et oosp. nov. is described on the basis of abundant eggshell fragments from the La Cantalera 1 site in the Early Cretaceous (early Barremian) Blesa Formation, Teruel Province, northern Spain. The surface ornamentation, the most diagnostic feature of the new oogenus, consists of closely spaced sub-triangular or rounded protuberances that have not previously been reported in any other ootaxon. The eggshells present three distinct layers, with a gradual transition between prismatic and mammillary layers, and a poorly developed external layer with progressive prismatic to external layer transition, a combination of characters that allows them to be assigned to Prismatoolithidae. Phylogenetic analyses based on oological characters place Trigonoolithus at the base of Prismatoolithidae.2015http://zaguan.unizar.es/record/4817210.4202/app.2012.0069http://zaguan.unizar.es/record/48172oai:zaguan.unizar.es:48172info:eu-repo/grantAgreement/ES/MINECO/BES-2008-005538info:eu-repo/grantAgreement/ES/DGA/B064-08BACTA PALAEONTOLOGICA POLONICA 59, 4 (2015), 843-854byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess