Amynthas heshanensis, Zhang & Li & Qiu, 2006

Zhang, Wei-Xin, Li, Jian-Xiong & Qiu, Jiang-Ping, 2006, New earthworms belonging to the genus of Amynthas Kinberg (Megascolecidae: Oligochaeta) and Drawida Michaelsen (Moniligastridae: Oligochaeta) from Guangdong, China, Journal of Natural History 40 (7 - 8), pp. 395-401 : 396-399

publication ID	https://doi.org/ 10.1080/00222930600661987
persistent identifier	https://treatment.plazi.org/id/9F118782-6345-FF95-C0D5-A1784E36FD71
treatment provided by	Felipe
scientific name	Amynthas heshanensis
status	sp. nov.

Treatment

Amynthas heshanensis sp. nov.

( Figure 1 View Figure 1 )

Type material

Holotype: a mature specimen (dissected) collected 4 May 2004 from Heshan station (22 ° 419N, 112 ° 549E), Guangdong Province, China, coll. Weixin Zhang (coll. no. 2004- 003 GDHS) . Paratype: a mature specimen (coll. no. 2004-013 GDHS) collected 4 May 2004 (same collection site as for holotype) .

Other material

Two immature specimens collected 4 May 2004, same collection as holotype. External characters

Preserved specimens greyish on dorsum, whitish on ventrum. Dimensions 110 mm by 2– 2.5 mm at clitellum, segments number 94–108. Annulets conspicuous in segments V–XIII. Prostomium proepilobous. First dorsal pore in 11/12. Setae minute, slightly long, 30 at III, 39–42 at V, 42–51 at VIII, 48–54 at XX, 39–60 at XXV; 13 between male pores, setal formula: aa51.1–1.5 ab, zz51.2 zy. Clitellum annular, pinkish colour, in XIV–XVI, setae visible externally.

Spermathecal pore: two pairs in 6/7–7/8, ventral, inconspicuous externally. Genital markings not present.

Male pore: one pair in XVIII, 0.4 body circumference ventrally apart from each other, each on the top of a capsula-like porophore surrounded by several circular folds. Genital papillae not present ( Figure 1A View Figure 1 ).

Internal characters

Septa 6/7–7/8, 10/11–11/12 comparatively thickened, 8/9–9/10 absent. Gizzard short pachyrhizus-shaped, moderately developed, in VIII–X. Intestine enlarged distinctly from XV. Intestinal caecae paired in XXV, simple, smooth, extending anteriorly to XXII. Oesophageal hearts in X–XIII, whitish.

Spermathecae two pairs in VII–VIII, ampulla oval-shaped, about 2 mm long. The duct is so short as to be inconspicuous. Diverticulum curved, a little longer than the ampulla plus duct, terminal one-quarter dilated into a long chamber ( Figure 1B View Figure 1 ). No accessory glands observed.

Holandry: testis sac two pairs, small, in X–XI, separated from each other. Seminal vesicles paired in XI–XII, well developed, with large conspicuous dorsal lobes. Prostate glands developed, extending from XVII to XXII. Prostatic duct slender, slightly curved at the distal part. No accessory glands present.

Locality and habitat

The specimens were collected from vegetable plots near the orchard (elevation 40 m) of Heshan station , one of the core stations of the Chinese Ecological Research Network ( CERN) of the Chinese Academy of Sciences, which is located in Heshan County, Guangdong Province, China .

Remarks

Amynthas heshanensis is somewhat similar to Amynthas zhongi ( Qiu et al. 1991) , Amynthas sanchongensis ( Hong and James 2001) , Amynthas paiki (Hong et al. 2001) , and Amynthas taebaekensis ( Hong and James 2001) . However, it is easy to distinguish Amynthas heshanensis from A. zhongi by the larger body size, the much shorter spermathecal duct, and the XXV originating caecae, from Amynthas sanchongensis , Amynthas paiki , and Amynthas taebaekensis by the simple structure of male pores, the absent genital markings and papillae, and the simple XXV originating caecae. Amynthas sanchongensis has a distinct lateral cresentic groove on the apex of the porophore. Amynthas paiki has two pre-setal pairs of genital papillae in XVIII, pre-setal paired sets of two genital markings in segments VII and VIII, and its caecum is manicate, each consisting of six to seven finger-shaped sacs, originating from XXVII. Amynthas taebaekensis has only one pair of post-setal genital papillae in XVIII.

Amynthas jiangmenensis sp. nov.

( Figure 2 View Figure 2 )

Type material

Holotype: a mature specimen (dissected) collected 3 May 2004 from Heshan station (112 ° 549E, 22 ° 419N), Guangdong Province, China, coll. Weixin Zhang (coll. no. 2004- 005 GDHS).

External characters

Preserved specimens greyish brown on dorsum, whitish on ventrum, whitish setae line is conspicuous. Dimensions 65 mm by 1.7 mm at clitellum, segments number 110. Annulets inconspicuous. Prostomium proepilobous. First dorsal pore in 11/12. Setae slightly long, thick and comparatively sparse at III–VIII, 27 at III, 33 at V, 48 at VIII, 42 at XX, 39 at XXV; nine between male pores, and 16 between spermathecal pores (VII). Setae formula: aa51.6 ab, zz51.5 zy. Clitellum annular, pinkish colour, in XIV–XVI, setae invisible externally.

Spermathecal pore: two pairs in 6/7–7/8, ventral, inconspicuous externally. Genital markings not present.

Male pore: one pair in XVIII, on the centre of a slightly raised, transverse, ellipse-like porophore, 0.3 body circumference apart from each other, surrounded by several circular folds. Genital papillae not present ( Figure 2A View Figure 2 ).

Internal characters

Septa 5/6–7/8, 10/11–11/12 comparatively thickened, 8/9–9/10 absent. Gizzard short potshaped, moderately developed, in VIII–X. Intestine enlarged distinctly at segment XIV. Intestinal caecae paired in XXV, simple, smooth, with some indentations on one edge, extending anteriorly to XXII. Oesophageal hearts in X–XIII.

Spermathecae two pairs in VII–VIII, ampulla long, narrow oval-shaped, whitish, about 1.5 mm long, not marked off from the duct. The duct is slender, about 0.6 mm long. Diverticulum is as long as the duct, with an enlarged chamber. No accessory glands are present ( Figure 2B View Figure 2 ).

Holandry: testis sac two pairs, small, in X–XI, separated from each other. Seminal vesicles paired in XI–XII, small. Prostate gland well developed, the duct much thickened, enlarged at mid-length. No accessory glands present.

Locality and habitat

The holotype was collected at an abandoned nursery near the orchard (elevation 40 m) in Heshan station (112 ° 549E, 22 ° 419N), one of the core stations of the Chinese Ecological Research Network ( CERN) of the Chinese Academy of Sciences, which is located in Heshan County, Guangdong Province, China .

Remarks

Amynthas jiangmenensis is closely related to Amynthas heshanensis sp. nov. However, they differ markedly in the structures of the male porophore and spermathecae. In addition, seminal vesicles of A. jiangmenensis were smaller than those of A. heshanensis sp. n.