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