Alvarez, W., 1976. A former continuation of the Alps. Bull. geol. Soc. Am. 87: 891–896.
Alvarez, W. Cocozza, T. & Wezel, F. C., 1974. Fragmentation of the Alpine orogenic belt by microplate dispersal. Nature 248: 309–314.
Ball, I. R., 1969. Dugesia lugubris (Trisladida, Paludicola), a European immigrant into North American freshwaters. J. Fish. Res. Bd Can. 26(2): 221–228.
Ball, I. R., 1974. A contribution to the phylogeny and biogeography of the freshwater triclads (Platyhelminthes; Turbellaria). In N. W. Riser and M. P. Morse (eds.), The biology of the Turbellaria. McGraw-Hill Book Company, New York, pp. 339–401.
Ball, I. R. & Gourhault, N., 1975. The morphology, karyology and taxonomy of a new freshwater planarian of the genus Phagocata from California (Platyhelminthes; Turbellaria), Life Sci. Contr. R. Ont. Mus. 105: 1–19.
Ball, I. R., Gourbault, N. & Kenk, R., 1981. The planarians (Turbellaria)_of temporary waters in castern North America. Life Sci. Contr. R. Ont. Mus. 127: 1–27.
Benazzi, M., 1963. Geneties of reproductive mechanisms and chromosome behavior in some freshwater triclads. In: E. C. Dougherty (ed.). The lower Metazoa. Univ. of California Press, Berkeley and Los Angeles, pp. 405–422.
Benazzi, M., 1974. Fissioning in planarians from a genetic standpoint. In: N. W. Riser and M. P. Morse (eds.), The biology of the Turbellaria. McGraw-Hill, New York. pp. 476–492.
Benazzi, M. & Benazzi-Lentati, G., 1976. Animal Cytogeneties, vol. 1. Platyhelminthes. Gebr. Borntraeger. Berlin and Stuttgart, 182 pp.
Benazzi, M., Ballester, R., Baguña, J. & Pucinelli, I., 1972. The fissiparous race of the planarian Dugesia lugubris s.l. found in Barcelona belongs to the biotype G. Caryologia 25: 59–68.
Benazzi, M., Baguñà, J., Ballester, R. Pucinelli, I. & Del Papa, R., 1975. Further contributions to the taxonomy of the ‘Dugesia lugubris-polychroa group’ with deseription of Dugesia mediterranea n. sp. (Trieladida, Paludicola). Boll. Zool. 42: 81–89.
Biju-Duval, B., Dercourt, J. & Le Pichon, X., 1976. In: B. Biju-Duval and L. Montadert (eds.). Structural history of the mediterranean basins, pp. 143–164 (Ed. Technip Paris 1976).
Cardona, M. A. & Contandriopoulos, J., 1979. In: D. Brambwell (ed.), Plants and islands. Academic Press, pp. 133–169.
Gourbault, N., 1969. Expansion de Dugesia tigrina (Girard), planaire américaine introduite en Europe. Annls Limnol. 5(1): 3–7.
Levan, A., Fregda, K. & Sandberg, A. A., 1964. Nomenclature for centromeric position on chromosomes. Hereditas 52: 201–220.
Reynoldson, T. B., Smith, B. D. & Maitland, P. S., 1981. A species of North American triclad new to Britain found in Loch Ness, Scotland. J. Zool. (Lond.) 193: 531–538.
Sluys, R. & De Jong. H. Chromosome morphological studies of Dugesia gonocephala s.l. (Platyhelminthes. Trieladida). Caryologia (in press).
Van den Berg, J., 1979. Reconstructions of the western mediterranean area for the mesozoic and tertiary timespan. Geologic Mijnb. 58(2): 153–160.