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A new study of the trilobite record in the Mansilla Formation (Iberian Chains, NE Spain) has led to the discovery of the presence of Bailiaspis aff. tuberculata, B. cf. tuberculata and Bailiaspis sp., the fi rst certain citation of this genus in the Mediterranean subprovince. The age of the fi ndings extends from Eccaparadoxides asturianus Zone (upper Leonian) to the lowermost Badulesia tenera Zone (lower Caesaraugustan), which correspond to the upper part of Stage 5 of Cambrian Series 3 and, probably, the lowermost Drumian. The specimens show the cranidial anterior border expanding backwards, forming a plectrum that is characteristic of Bailiaspis. The main characters of the three taxa include: a low convexity of the cranidium, with a very short or absent preglabellar fi eld, and a cranidial sculpture with numerous densely-packed coarse tubercles. The only species that shows these diagnostic characters is Bailiaspis tuberculata from the middle Cambrian of England (Nuneaton, Warwickshire) in horizons inconclusively dated as the Ptychagnostus gibbus RESUMEN El estudio de del registro de los trilobites de la Formación Mansilla (Cadenas Ibéricas, NE de España) ha permitido reconocer la presencia de Bailiaspis aff. tuberculata, B. cf. tuberculata y Bailiaspis sp., supone la primera cita confi rmada de este género en la subprovincia Mediterránea. La edad de los hallazgos se extiende desde la Zona de Eccaparadoxides asturianus (Leoniense superior) a la parte inferior de la Zona de Badulesia tenera (Caesaraugustiense inferior), que se corresponden con la parte superior del piso 5 del Cámbrico y, probablemente, con la parte basal del Drumiense (Serie 3 del Cámbrico). Los especímenes muestran su borde anterior del cranidio expandido posteriormente, constituyendo un plectrum, que es característico del género Bailiaspis. Los caracteres principales de los tres taxones estudiados son la baja convexidad del cranidio, un área preglabelar reducida o ausente y una ornamentación densa de tubérculos gruesos. La única especie de este género que presenta estos caracteres diagnósticos 18 CHIRIVELLA MARTORELL, LIÑÁN, DIES ÁLVAREZ & GOZALO Zone (Cambrian Stage 5). This zone has been previously correlated with the upper Leonian and lower Caesaraugustan; thus, the British and Spanish materials are probably of similar age.

Bailiaspis (Trilobita) with English affinities from the Mansilla Formation (Cambrian Series 3 of the Iberian Chains; NE Spain)