M. Vranovsky, ON THE RECORD OF URNATELLA-GRACILIS LEIDY, 1851 (KAMPTOZOA) IN EAST SLOVAKIA, WITH REMARKS ON ITS ECOLOGY AND GEOGRAPHICAL-DISTRIBUTION, BIOLOGIA, 49(5), 1994, pp. 659-666
In potamoplankton samples of the river Tisza (East Slovakia) the autho
r identified Urnatella gracilis Leidy (1851), the only extant freshwat
er representative of Kamptozoa (= Entoprocta). He presents the morphol
ogical characteristics of the colonies from the river Tisza and discus
ses the species geographical distribution. He suggests, there is no un
ambiguous evidence testifying that U. gracilis spread from North Ameri
ca to other continents only recently.