DOI: 10.5281/zenodo.18353398
title: TABLE 6. Distinguishing morphological characteristics among A in Three newly discovered species of Amynthas earthworms (Oligochaeta: Megascolecidae) from Jiangxi Province and adjacent regions of China

description: TABLE 6. Distinguishing morphological characteristics among A. huizhouensis sp. nov., A. rockefelleri (Chen, 1933), A. carnosus (Goto & Hatai, 1899), A. fluxus (Chen, 1946), and A. accessorius Qiu & Zhao, 2018
Morphological featureA. huizhouensis sp. nov.A. rockefelleri (Chen, 1933)A. carnosus (Goto & Hatai, 1899)A. fluxus (Chen, 1946)A. accessorius Qiu & Zhao, 2018Literature referencePresent studyChen, 1933Xiao et al., 2023Chen, 1946Zhao et al., 2018Body dimensions (mm)68–78 length, 2.1– 4.1 width85–130 length, 3.0–4.2 width143–153 length, 5–8 width100 length, 5 width78–80 length, 2.7–3.0 widthSecondary annulationsLast one-third of body segmentsThree annulations after segment V--AbsentLocation of first dorsal poreIntersegmental furrow 12/13Intersegmental furrow 11/12Intersegmental furrow 13/14Intersegmental furrow 12/13Intersegmental furrow 12/13Spermathecal pores3 pairs, 5/6–7/8; milky white margin3 pairs, 5/6–7/8; invisible, sometimes with a small dark porophore3 pairs, 5/6–7/83 pairs, 5/6– 7/8; each within an ellipsoidal area3 pairs, 5/6–7/8; eye-likeDistance between spermathecal pores0.33 × total body circumference0.27 × total body circumference-0.57 × total body circumference0.33 × total body circumferenceGenital papillae within spermathecal pore region0, 1, or 2 pairs on segments VII or VIIIPresent or absentTwo pairs located on segments VII and VIIIAbsentAbsentMale poresRound, glandular, raised porophoreSmall, round porophore with multiple concentric foldsDepressed, large porophore projecting outwardLocated within a shallow skin foldAppears as a round, pulvinate protuberanceGenital papillae within male pore regionOne to two papillae located anterior and medial to each male porophore, traversing intersegmental furrow 17/18One pair on segment XVIII, postsetal and large; some specimens possess an additional medial pair or extra medial papillaeTwo pairs of genital papillae on segment XVIII, and one pair on segment XIXEach male pore possesses two papillae on its medial side, one on segment XVIII and the other on segment XIXPaired ovoid genital papillae associated with pre- and postsetae located on the inner side of segment XVIIIProstate glandSmall, extendingAbsent; onlyLocated inLocated inDegeneratedfrom the posterior half of segment XVI to segment XVIIIprostatic ducts presentsegments XVI– XXsegments XVI– XIXProstatic ductSmall, U-shaped, located in segment XVIII--Slender and uniformly thickenedS- or U-shaped, located in segment XVIIIAccessory glands within prostate gland regionAbsent or stalkedLarge, corresponding to external papillaeA large glandular patch, located in segments XVIII and XIXSessile, cotton-like cushionsTwo large accessory glands located on the right side of segments XVIII and XIXSpermathecaeAmpullae are baror heart-shaped; spermathecal ducts equal to or twice the length of the ampullaeAmpulla round to rod-shaped, with a slender stalk-Ampulla sac-like, about 1 mm in widthAmpullae ovoid, ducts twice the length of the ampullaeDiverticulumMeasures half or three-fifths the length of the main spermathecal axisSlender, rod-shapedHalf the length of main sac and ductLonger than the main pouchAbsent in the first pair; second and third pairs are three-fourths and half the length of the main pouch, respectivelyAccessory glands within the spermathecal regionAbsent---Absent
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Note: - means data not available.
description: Published as part of Sun, Jing, Wang, Ding-Yi, Qiu, Jiang-Ping, Jiang, Ji-Bao & Liu, Man-Qiang, 2025, Three newly discovered species of Amynthas earthworms (Oligochaeta: Megascolecidae) from Jiangxi Province and adjacent regions of China, pp. 305-306 in Zootaxa 5729 (2) on page 305, DOI: 10.11646/zootaxa.5729.2.4, http://zenodo.org/record/17936119