Description of three new Korean earthworms of the genus Amynthas Kinberg, 1867 (Oligochaeta, Megascolecidae) with multiple genital markings

The presence of genital markings in sexually mature Amynthas species provides important taxonomic characters. An unusual number or distribution of markings are of particular interest. The present paper describes three new Amynthas species with multiple genital markings: Amynthas songnisanensis sp. n., Amynthas ephippiatus sp. n., and Amynthas multimaculatus sp. n. In Amynthas songnisanensis sp. n. and Amynthas ephippiatus sp. n. the ventral zone of the clitellar segments lacks clitellar development, making the clitellum saddle-shaped. This is very unusual among Amynthas and the perichaetine Megascolecidae as well. Complete descriptions of the new species are provided, including illustrations of ventral view and spermathecae.