- 期刊
A New Record of the Octochaetid Earthworm Dichogaster affinis (Michaelsen, 1890) from the Centro-western Taiwan
台灣新紀錄種蚯蚓乳突重胃蚓Dichogaster affinis (Michaelsen, 1890)
摘要
本文描述一台灣新紀錄種蚯蚓乳突重胃蚓Dichogaster affinis (Michaelsen, 1890)。其爲小型蚯蚓，屬於八毛蚓科(Octochaetidae) 重胃蚓屬(Dichogaster)，具有兩對前列腺及一對雌性生殖孔，且在7/8至9/10體節間有生殖乳突。在台灣其餘兩種同屬物種爲Dichogaster saliens (Beddard, 1892)及Dichogaster bolaui (Michaelsen, 1891)，前者僅具一對前列腺，後者具有兩對前列腺但僅有一個雌性生殖孔且不具生殖乳突。D. affinis的發現使得台灣成爲此種廣布種蚯蚓在東亞分布的北界。
並列摘要
This paper describes the octochaetid earthworm Dichogaster affinis (Michaelsen, 1890) as a new record from the centro-western Taiwan. It is a small earthworm with two gizzards, belonging to the family Octochaetidae. D. affinis is quadriprostatic and has a pair of female pores in XIV and genital markings in 7/8-9/10. It is easily distinguishable from other two congeneric species in Taiwan, Dichogaster saliens (Beddard, 1892) that is biprostatic and Dichogaster bolaui (Michaelsen, 1891) that is quadriprostatic but has a single female pore and no genital marking. Occurrence of D. affinis in Taiwan reported herein constitutes the island as the northernmost range of this cosmopolitan species in East Asia.