This fossil foraminiferan was found in Carboniferous strata in the Cantabrian Mountains, in Spain. Image courtesy of Dr. Elisa Villa, University of Oviedo, Spain. Citation: Villa, E. and Sanches de Posada, L.C. Tenebrosella (Foraminiferida, Biseramminidae), nuevo genero del Carbonifero Cantabrico. Revista Espanola de Paleontologia, 1:85-92.