A new earthworm species of the genus Amynthas (Clitellata: Megascolecidae) from northern Taiwan, false synonymy between Amynthas corticis (Kinberg, 1867) and Amynthas sheni (Chen, 1935) and other taxonomic issues relating to A. corticis Author Shen, Huei-Ping Taiwan Biodiversity Research Institute, Ministry of Agriculture, 1 Ming-shen East Road, Jiji, Nantou 552, Taiwan Author Chang, Chih-Han Department of Life Science, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan & Institute of Ecology and Evolutionary Biology, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan chihhanchang@ntu.edu.tw & chihhanchang.ntu@gmail.com text Zootaxa 2025 2025-02-19 5589 1 112 126 https://doi.org/10.11646/zootaxa.5589.1.10 journal article 308306 10.11646/zootaxa.5589.1.10 ed8120b4-c685-4cd7-88a3-0aa7c079d337 1175-5326 14896799 B8D0015B-EF2D-4890-92AD-94CB815B8658

TABLE 3. A comparison of characters among Amynthas popi sp. nov., A. corticis (Kinberg, 1867), A. carnosus (Goto & Hatai, 1899), A. biorbis Tsai & Shen, 2010, A. shengtangmontis Dong & Jiang, 2019, and A. gageodo Blakemore, 2012. Data from the original descriptions except those for A. corticis and A. carnosus.

	Amynthas popi	Amynthas corticis	Amynthas carnosus	Amynthas biorbis	Amynthas shengtangmontis	Amynthas gageodo
1 Data from Gates (1972). 2 Data from Chang et al. (2016). 3 Data from Kobayashi (1936).
	sp. nov.	(Kinberg, 1867)	(Goto & Hatai, 1899)	Tsai & Shen, 2010	Dong & Jiang, 2019	Blakemore, 2012
Locality	northern Taiwan	cosmopolitan	Japan, Korea, China	eastern Taiwan	southern China	South Korea
Length (mm)	210–316	45–1701	110–3402	61–86	100–134	150–170
Clitellum width (mm)	7.25–8.6	3–61	4–92	2.63–3.32	4.2–5.1	–
Segments	138–150	79–1211	106–1792	72–97	116–138	91
First dorsal pore	12/13	10/11, 11/12 or 12/131	12/132	11/12	12/13	12/13
Setal number
VII	54–60	26–46 (VIII)1	40–63 (IX)3	33–40	26–32 (VIII)	–
XX	63–92	39–541	–	41–48	33–40	66–74
between male pores	12–15	8–161	12–263	8–12	8–11	–
Genital papillae preclitellar	closely or widely paired in presetal VIII	absent or widely paired or unpaired in presetal VI–IX with or without one anterior or posterior to each spermathecal pore	closely or widely paired in presetal VIII–IX	absent	widely paired in presetal VI–IX	closely paired in presetal VIII–XI and widely paired in postsetal VIII–IX
postclitellar	one medial to each male pore in postsetal XVIII; widely paired in postsetal XIX, and occasionally with an additional pair in presetal XIX	0–3 around each male pore	one medial to each male pore in postsetal XVIII; paired in presetal XVIII–XIX	absent or one medial to each male pore in postsetal XVIII	one medial to each male pore in postsetal XVIII	closely paired in presetal XVII–XX and widely paired in postsetal XVIII–XX
Hearts	XI–XIII	XI–XIII	last in XIII3	XI–XIII	X–XIII	X–XIII
Spermathecae	VI–IX	VI–IX	VI–IX or VII–IX2	VI–IX	VI–IX, diverticulum long	VI–IX
Seminal vesicles	small	small	variable in size3	small	well-developed	moderately large
Prostate glands	compact in XVIII	absent or rudimentary	large in 1/2XVI–XIX3	Large in XVI–XX	XV–XXII	–
Prostatic ducts	short, stout, horizontal in XVIII	C- or U-shaped in XVIII	U-shaped in XVIII3	U-shaped in XVIII	U-shaped	–
Accessory glands	absent	stalked	round3	large, sessile	stalked	small, sessile