Published December 31, 2019
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Table 3. A in Three new species and one subspecies of the Amynthas corticis - group from Guangxi Zhuang Autonomous Region, China (Oligochaeta, Megascolecidae)
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Description
Table 3. A comparison of characters of A. tortuosus sp. nov., A. carnosus, A. corticis, A. homosetus, A. exiguus aquilonius, and A. stricosus.
| Characteristics | A. tortuosus sp. nov. | A. carnosus | A. corticis | A. homosetus | A. exiguus aquilonius | A. stricosus |
|---|---|---|---|---|---|---|
| Body length (mm) | 55-86 | 110-340 | 45-170 | 116 | 39-63 | 72-97 |
| Body width (mm) | 2.5-2.8 | 4.0-9.0 | 3.0-6.0 | 5.2 | 1.9-2.6 | 2-2.8 |
| Pigment | ||||||
| dorsum | Purple brown before clitellum, light purple brown after | Dark brown or purple | Greenish brown | Dark chocolate on anterior, grey on other parts | Dark reddish brown | No pigment |
| ventrum | Light purple brown before clitellum, no after | Dark brown or purple | No | Grey | Light gray on ventrum | No pogment |
| First dorsal pore | 13/14 | 12/13 | 10/11 or 12/13, usually at 11/12 | 12/13 | 6/7 | 11/12 or 12/13 |
| Clitellum locality | XIV–XVI | XIV–XVI | XIV–XVI, occasionally shorter | XIV–XVI | XIV–XVI | XIV–XVI |
| Setal formula | AA=1.2-2.0AB, ZZ=1.4-2.0ZY | - | ||||
| Spermathecal pores | 4 pairs, in 5/6-8/9, 0.25C | 4 pairs in 5/6-8/9 or 3 pairs in 6/7-8/9, 0.33C | 4 pairs, 5/6-8/9, 0.33C | 4 pairs, in 5/6-8/9, 0.25C | 4 pairs, 5/6-8/9, ventral, 0.45C | 4 pairs, 5/6-8/9, 0.40C |
| Male pores | Middle, round, surrounded by 3-4 rhombic ridges, 0.25C | Round or elliptic | Small, circular to transverse elliptical di sc,0.24-0.30C | Roundish glandular area, about 1.5mm in diameter, 0.25C | Round, smooth, slightly elevated with a male aperture inconspicuous on lateral concave area, 0.23-0.30C | on a coniform glandular disc surrounded by a round pad, 0.33C |
| Papillae preclitellum | Four pairs of postsetal genital papillae in VI–IX | 8 papillae just overhead 8 spermathecal pores, 2 pairs preclitellar arranged on VIII and IX | Paired presetal and/or postsetal in some or all, near spermathecal pores | Invisible | presetal and postsetal, widely paired in 7, 8 and 9, number highly variable | Invisible |
| Papillae postclitellum | 2 presetal crescent indented-topped genital papilla medial of male pores | 2 paired presetal genital on XVIII and IX, 1 pair postsetal genital on XVIII | Present or absent, occasionally one or more near male pore | Invisible | presetal and postsetal, widely paired in XVII, XVIII and XIX, number highly variable | postsetal, single or paired in XVII, XIX and XX |
| Prostate glands | XVII–XXII | Well developed | XVII–XX, rudimentary or absent | XVI–XXI | XVI–XX, wrinkled | XVI–XX, coarsely lobate |
| Spermathecae | About 2.4mm long, ampulla slender heart-shaped; duct short | Ampulla oval or pear-shaped, duct equal to or slightly shorter than ampulla | Ampulla ovoid | - | Ampulla peach-shaped, stalk straight, much shorter than ampulla | About 1.6mm long; ampulla heart-shaped, gradually slender duct as long as ampulla |
| Diverticulum | About 2.0mm long, terminal 4/5, swollen, S-shaped twisted seminal chamber | One-third to half of ampulla, slender stalk and a wider seminal chamber | Blunt ovioid, straight stalk | Shorter, seminal chamber ovoid and whitish | Shorter, seminal chamber rudimentary or absent, straight or slightly bent | As long as main spermathecal axis, slender, terminal 0.4 dilated into a band shaped chamber |
| Accessory glands | 1 stalked accessory gland observed near the ental part of each spermatheca | - | Stalked, coelomic, bound down to parietes or retained within body wall | Invisible | round, stalked observed in spermathecal pores and male pores region | Invisible |
Notes
Published as part of Dong, Yan, Law, Michelle Man Suet, Jiang, Jibao B. & Qiu, Jiangping P., 2019, Three new species and one subspecies of the Amynthas corticis - group from Guangxi Zhuang Autonomous Region, China (Oligochaeta, Megascolecidae), pp. 23 in ZooKeys 884 on page 23, DOI: 10.3897/zookeys.884.30988
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