Abstract
Alona rustica and Camptocercus uncinatus are two species of Chydoridae new to Italy; the former was found in some samples from the Island of Elba and Ayas Valley (Aosta), and the latter from Lakes Martignano and Bracciano. The typical morphology of these Italian populations is described in this paper together with differences compared to the European populations of the same species. Finally, information is given about their distribution and ecology.