REDESCRIPTION AND NEW RECORDS OF MACKOJA-PODIRUFI (MACKO, 1962), WITHAN AMENDED DIAGNOSIS OF MACKOJA KORNYUSHIN, 1983 (CESTODA, HYMENOLEPIDIDAE)

Mackoja podirufi (Macko, 1962) [synonyms Echinocotyle podirufi Macko, 1962; Podicipitilepis laticauda of Korpaczewska, 1974] is recorded fro m grebes Tachybaptus ruficollis and Podiceps nigricollis in Bulgaria ( new geographical record) and from T. ruficollis in Germany (new geogra phical record). The species is redescribed on the basis of specimens f rom Bulgaria and Germany plus paratypes from Slovakia. In contrast to the original description, an external seminal vesicle and a cirrus-sty let are observed, while an accessory sac is absent. The diagnosis of t he monotypic genus Mackoja Kornyushin, 1983 is amended. Mackoja is con sidered to be similar to the genus Podicipitilepis Yamaguti, 1956, wit h the type-species P. laticauda Yamaguti 1956, described from T. rufic ollis in Japan. A hypothesis is proposed recognising M. podirufi and P . laticauda as geographical vicariants.