Abstract

Four new species of the genus Minona Marcus, 1946 from eastern Australia are described. Minona proculvaginata sp. n., M. australis sp. n. and M. concharum sp. n. have four genital pores, and differ in details of the copulatory organs. The epidermis of these three species is unciliated in a ventral area around the male pore. Based on this synapomorphic feature, they are sister species. The karyotype of M. proculvaginata and M. concharum is described. Minona heronensis sp. n. is distinct from congeneric species on the basis of the size of its accessory stylet and copulatory organ, pore indices and karyotype. It is compared to numerous similar Indo-Pacific species. Additional data on the anatomy and karyology of M. beaglei Martens & Curini-Galletti, 1989 from N. Australia, are given. One specimen from Heron Island is tentatively attributed to M. dolichovesiculu Tajika, 1982 a species widely distributed in the Indo-Pacific. Its karyotype is given.

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