New species of Amynthas Kinberg, 1867 from the Philippines (Oligochaeta: Megascolecidae)

Six new Amynthas are described from the Philippines: Amynthas isarogensis sp. n., Amynthas malinaoensis sp. n., Amynthas philippinensis sp. n., Amynthas mindoroensis sp. n., Amynthas halconensis sp. n. and Amynthas bacoensis sp. n. Amynthas isarogensis sp. n. and Amynthas malinaoensis sp. n. have a proandric male sexual system and small penes within enlarged prostatic ducts. Amynthas philippinensis sp. n. has spermathecal pores in 4/5, Amynthas mindoroensis sp. n. has spermathecal pores in 4/5, 5/6, Amynthas halconensis sp. n. has spermathecal pores in 4/5, 5/6, and 6/7, and Amynthas bacoensis sp. n. has spermathecal pores in 4/5, 5/6, 6/7, and 7/8. These last four species also have small hoods over the male pores. Amynthas halconensis sp. n. and Amynthas bacoensis sp. n. were only collected in soils, while the other 4 species were collected in both soils and arboreal habitats. All 6 new species lack genital markings in the spermathecal segments. Descriptions of the new species are provided, including illustrations of the ventral view, male pore region, and spermathecae.