A new species of the Amynthas corticis group with support from mitogenomic data and a new record of Metaphire agrestis (Goto & Hatai, 1899) (Oligochaeta, Megascolecidae) in northeastern China Author Han, Anne Charis N. https://orcid.org/0009-0000-7312-4985 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China & State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China Author Zhao, Nannan https://orcid.org/0009-0005-4694-3121 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China Author Aspe, Nonillon M. 0000-0003-0025-6017 College of Environment and Life Sciences, Mindanao State University at Naawan, Misamis Oriental, Naawan 9023, Philippines Author Nob, Christian Jay R. 0000-0003-2463-6698 State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China Author Zhang, Yufeng 0000-0002-4066-6355 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China Author Wu, Donghui 0000-0001-8778-0107 State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China & Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China Author Zhao, Huifeng 0000-0003-4243-9671 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China & Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China text ZooKeys 2026 2026-01-12 1266 231 261 journal article 313703 10.3897/zookeys.1266.161903 7f572354-0167-4afa-a8ee-1c0d01077429 3A9374B8-02B0-4BFC-BF13-CA86BC51B6C4
Comparison of species belonging to the A. corticis species group in China. The species are listed in order of size from smallest to largest.
CharactersA. meishanensisA. manicatus decorosusA. dinghuensisA. dandongensis sp. nov.A. nanshanensisA. taoyuanensisA. pavimentusA. libratusA. tortuosusA. penpuensisA. recavus
Length38–654040–5241–5741–8941–12051–12155–7255–8655–10458–64
Width2.7 – 3.52.51.0–2.52.2–3.03.5–4.51.98–3.962.31–3.032.5–2.82.2–3.22.1–2.3
No. of segments51–1136075–8786–10450–10461–10361–10362–71-62 – 10482–84
1 st dorsal pore10 / 11pore-like marking from 7 / 811 / 12 or 12 / 1312 / 135 / 610 / 115 / 6 or 6 / 75 / 613 / 145 / 6 or 6 / 712 / 13
Male porespresentpresentpresentabsentpresentpresentpresentpresentpresentpresentpresent
Genital markingspresentpresentpresentabsentpresent or absentpresentpresentpresentpresentpresentpresent
Spermathecae ampullapeach-shaped or ovalampulla same length as ductelongated oval-shaped (varied)oval-shapedpeach-shapedoval-shapedround to oval-shapedround or oval-shapedampulla slender heart-shapedpeach-shapedelongated oval-shaped
Diverticulumstraight stalk as long as the receptacle with peach-shaped receptaclemay be looped into regular zigzag or not loopedslender stalk and oval-shaped receptacleslender and long duct, with ovoid receptacleslender stalk and oval receptaclestalk 2 / 3 of main pouch, bag-shaped receptacleslender stalk and small oval-shaped receptacleslender stalk and small oval-shaped receptacleswollen, S-shaped twisted receptacleslender stalk and small oval receptacle~ 3 / 5 of main pouch, ovoid-shaped receptacle
Prostate glandpaired in XVIII, large w / thick ductpaired in XVIII, extending XVII – XIXpaired in XVIII, smooth and lobed extending XIV – XXabsentpaired in XVIII, extending XVII – XXdegenerated, duct U-shaped inserting in XVIIIpaired in XVIII, large, rectangular-shaped, extending XVI (XVII) – XIX (XX)paired in XVIII, large, lobed, extending XVII – XXpaired in XVIII, extending XVII – XXII, coarsely lobatepaired in XVIII, extending XVII – XX1 / 2 XVII – XIX, relatively small, one lump
GizzardVII – X?large in VIII – XVIII – Xround, IX – XIX – Xlarge, round in VII – Xlarge, rectangular, VII – Xball-shaped, VIII – Xround, IX – XVIII – X, ball-like
Intestinal caecasimple, XXVII – XXIVcompound, XXVII – XXII or XXIIIsimple with a round, white end, XXVII – XXIIsimple, XXVII – XXIsimple, XXVII – XXVsimple, XXVII – XXIVsimple, XXVII – XXIII (XXIV)simple, XXVII – XXIII (XXIV)simple, XXVII – XXIVsimple, XXVII – XXV (XXIV)simple, XXVII, end in XXV