Contributo alla conoscenza dei Coleotteri degli ambienti acquatici della Toscana (Italia Centrale). VI. Aggiornamenti: Sphaeriusidae, Helophoridae, Georissidae, Hydrochidae, Spercheidae, Hydrophilidae (Coleoptera)

Contribution to the knowledge of the aquatic beetles of Tuscany (Central Italy). VI. Update: Sphaeriusidae, Helophoridae, Georissidae, Hydrochidae, Spercheidae, Hydrophilidae (Coleoptera). An update of the distribution in Tuscany of the family Sphaeriusidae, Helophoridae, Georissidae, Hydrochidae, Spercheidae, Hydrophilidae is given. The list includes 95 species: 1 Sphaeriusidae, 25 Helophoridae, 4 Georissidae, 7 Hydrochidae, 1 Spercheidae, 57 Hydrophilidae; for 9 of them the presence in Tuscany is to be considered erroneous or at least doubtful