  Urogenital schistosomiasis has been present naturally in the South of Europe
since the beginning of the 20 th century and nowadays its presence is also
known, at least imported by Sub-Saharan emigrants and tourists, in France,
Italy, Portugal and Spain. One of the intermediate hosts of this trematode
present in Europe is the bulinid mollusc Bulinus truncatus, non-native species
that can be reached to Europe by humans and birds. In order to know this
mollusc better, we carried out a morpho-anatomical study, of the shell, the
reproductive system, radula, the respiratory organs and pseudobranch of several
populations from Italy, France and Spain. Spanish conchological material
studied comes from different populations, from material deposited in the "Museo
Nacional de Ciencias Naturales" of Madrid and the "Museu de Ci{\`e}ncies
Naturals" of Barcelona, as well as from its own material deposited in the
"Museu Valenci{\`a} d'Hist{\`o}ria Natural" of Alginet (Valencia). The shell
growth in captivity and the estimation of the population age of B. truncatus
from El Ejido (Almer{\'i}a, Spain), has also been studied. Finally, the finding
of aphallic and euphallic specimens in the different populations of southern
Europe studied is presented and taxonomic and ecological data of the genus
Bulinus are shown.
