Photographic series of intermediate specimens between T. cilbanus and I. marmoratus ssp. A Hermitage of Virgencita, Algodonales, Sierra de Lijar (Cadiz Province) B Sierra Crestellina, Casares (Malaga Province). Below each photographic series, a tentative composition with the parents and an intermediate specimen in a central position is displayed. Selected shells of I. marmoratus ssp. come from the closest locations where sampling material was available: Cueva del Gato, Benaojan (Malaga Province) for series A and Gaucin Castle (Malaga Province) for series B.