本文描述一種發現於臺灣南部的新種蚯蚓。這蚯蚓屬於腔環蚓屬中有具有八個受精囊的stephensoni種群。在與此種群中的各物種比較形態特徵，顯示這個新種的存在。

Most earthworm species in Taiwan belong to the genus Amynthas or Metaphire in the family Megascolecidae. Within the 23 new species described from Taiwan between 1999 and 2004 (Shen and Tsai, 2002; Shen et al., 2002, 2003; Tsai et al., 1999, 2000a, b, 2001, 2002, 2003, 2004), Pithemera lanyuensis (Shen and Tsai, 2002) is the only species which was not belong to the two genera. On the other hand , most of the recently described species were collected from central Taiwan. Metaphire paiwanna and M. yeni are the only two new species which were found from southern Taiwan recently (tsai et al., 2000a, b). Due to limited survey in southern Taiwan, these results might evoke a bias image which shows the species richness of earthworm in southern Taiwan is lower than that in central Taiwan. This paper described a new species from southern Taiwan. This species belongs to the stephensoni-species group within Metaphire. The differences among all taxa within this group are also compared.