Resumen: Trigonoolithus 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. Idioma: Inglés DOI: 10.4202/app.2012.0069 Año: 2015 Publicado en: ACTA PALAEONTOLOGICA POLONICA 59, 4 (2015), 843-854 ISSN: 0567-7920 Factor impacto JCR: 1.503 (2015) Categ. JCR: PALEONTOLOGY rank: 25 / 54 = 0.463 (2015) - Q2 - T2 Factor impacto SCIMAGO: 0.998 - Paleontology (Q1)