Discocyclina sp. is a fossil foraminiferous protozoan that appears in strata of marine Eocene. It looks as a 10-15 mm diameter thin disk of symmetrical faces, often not completely flat but somewhat wavy. Its thickness ranges from 0.2 to 0.5 mm, except for the thickest nipple in the centre. The whole surface is plenty of minute granulations in a concentric arrangement that results from the sequence of new chambers formation and the calcareous shell growth.
The specimens of Discocyclina sp. in the images 1st and 2nd come from Santa Margarida de Montbui, in the neighbouring district of Anoia; the ones in images 3rd and 4th from Vallhonesta (Sant Vicenç de Castellet), in the district of Bages.
[photos Jordi Badia]