Amynthas douliouensis
Creators: name: Shen, Huei-Ping
name: Chang, Chih-Han
name: Chih, Wen-Jay
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Opisthopora
Megascolecidae
Amynthas
Amynthas douliouensis

description: <i>Amynthas douliouensis</i> Shen and Chang, sp. nov. (Figure 3) <i>Type material</i> <i>Holotype.</i> Clitellate (mature) specimen (78 mm in length, dissected) collected 11 December 2007 from roadside slope along the Fongshuhu South Creek (elevation 150 <i>–</i> 210 m) near the borders of Douliou and Linnei, Yunlin by C.H. Chang, T.J. Lin and Y.P. Li (TESRI-O-H- 48) (voucher number: WH 3 P 12). <i>Paratype.</i> One clitellate (same collection data as holotype, TESRI-O-P- 43). <i>Other material</i> Six clitellates (voucher number of specimen used for DNA barcoding analyses: WH 3 P 3) and an aclitellate collected 12 June 2007 from roadside slope along Waihu Creek (elevation 230 m) near the borders of Douliou and Linnei, Yunlin by M.H. Chen (coll. no. 2007 <i>–</i> 24); two clitellates collected 27 June 2007 from type locality by S.T. Chang and Y.P. Li (coll. no. 2007 <i>–</i> 27); five clitellates (voucher number of specimen used for DNA barcoding analyses: WH 3 P 14) and an aclitellate collected 18 July 2007 from type locality by C.H. Chang, T.J. Lin and Y.H. Lin (coll. no. 2007 <i>–</i> 45); two clitellates collected 16 August 2007 from type locality by C.H. Chang, Y.H. Lin and Y.P. Li (coll. no. 2007 <i>–</i> 65; voucher number of specimen used for DNA barcoding analyses: WH 3 P 13); one clitellate collected 13 September 2007 from type locality by T.J. Lin, Y.P. Li, L.H. Chen and H.I. Tsai (coll. no. 2007 <i>–</i> 85) (voucher number: WH 3 P 11); one clitellate collected 30 October 2007 from type locality by C.H. Chang, T.J. Lin and Y.P. Li (coll. no. 2007 <i>–</i> 105). <i>Diagnosis</i> Small to medium; length (clitellates) 78 <i>–</i> 120 mm. Segments numbering 82 <i>–</i> 99. Setae 40 <i>–</i> 45 in VII, 48 <i>–</i> 57 in XX, 9 <i>–</i> 14 between male pores. Clitellum XIV <i>–</i> XVI. First dorsal pore in 11 / 12 or 12 / 13. Spermathecal pores three pairs in 6 / 7 <i>–</i> 8 / 9, 0.29 body circumference ventrally apart. Male pores 0.25 body circumference ventrally apart in XVIII, each on a round porophore surrounded by three or four circular or diamond-shaped folds. Genital papillae widely paired in presetal VIII and IX, and absent, single or closely paired immediately anterior to setal line in the mid-ventral position in IX and X, number variable. Spermathecae three pairs in VII <i>–</i> IX. Accessory glands stalked, each corresponding to external genital papilla. Seminal vesicles small, two pairs in XI and XII. Prostate glands large in XVI <i>–</i> XX. Prostatic duct long, U-shaped in XVII <i>–</i> XVIII. <i>Description</i> <i>External characters.</i> Total length (clitellates) 78 <i>–</i> 120 mm. Weight 0.62 <i>–</i> 1.29 g. Segments numbering 82 <i>–</i> 99. Clitellum XIV <i>–</i> XVI, setae and dorsal pores absent, length 2.60 <i>–</i> 3.98 mm and width 3.16 <i>–</i> 4.55 mm. Prostomium epilobous. Setal number 40 <i>–</i> 45 in VII, 48 <i>–</i> 57 in XX, and 9 <i>–</i> 14 between male pores in XVIII. First dorsal pore in 11 / 12 or 12 / 13. Spermathecal pores three pairs in intersegmental furrows of 6 / 7 <i>–</i> 8 / 9, distance between paired pores about 0.29 body circumference ventrally apart (Figure 3 a). Genital papilla presetal, usually widely paired in presetal VIII and IX, and absent, single or closely paired immediately anterior to setal line in the mid-ventral position in IX and X, number variable. For 20 specimens examined, in VIII, two (widely paired) in 12 specimens, one on right in three specimens, absent in five specimens; in IX, four (widely and closely paired) in 11 specimens, three (widely paired and single median) in four specimens, two (widely paired) in four specimens, two (single median and one on left) in one specimen; in X, two (closely paired) in nine specimens, single median in three specimens, absent in eight specimens. Each papilla round, about 0.3 mm in diameter. Female pore single, mid-ventral in XIV. Male pores simple, paired in XVIII, about 0.25 body circumference ventrally apart, each on a small, round porophore surrounded by three or four circular or diamondshaped folds (Figure 3 b). Genital papillae usually absent in the postclitellar region, one tiny papilla anteromedial to right male porophore in one specimen and two tiny papillae anteromedial to left male porophore in one specimen. Preserved specimens reddish brown on dorsum and preclitellar region with orange brown clitellum and greyish brown ventrum. <i>Internal characters.</i> Septa 5 / 6 <i>–</i> 7 / 8 thick, 8 / 9 / 10 absent, 10 / 11 membranous, 11 / 12 <i>–</i> 13 / 14 muscular. Nephridial tufts on anterior faces of 5 / 6 / 7. Gizzard large in VIII <i>–</i> X. Intestine enlarged from XVI. Intestinal caeca long, simple, paired in XXVII and extending anteriorly to XXI. Oesophageal hearts in XI <i>–</i> XIII. Spermathecae three pairs in VII <i>–</i> IX, varied in size and shape (Figure 3 c). Each ampulla round, peach-shaped or elongated oval-shaped, surface wrinkled, 1.05 <i>–</i> 1.23 mm long and 0.65 <i>–</i> 0.97 mm wide, with a short, stout spermathecal stalk about 0.2 mm in length. Diverticulum with an iridescent, oval-shaped seminal chamber of 0.45 <i>–</i> 0.60 mm long and a slender stalk of 0.60 <i>–</i> 0.77 mm in length. Accessory glands stalked, 0.70 <i>–</i> 0.80 mm in total length, each corresponding to external genital papilla (Figure 3 c). Holandry: testes oval, two pairs in ventrally joined sacs in X and XI. Seminal vesicles small or normal, two pairs in XI and XII, occupying one-third to nearly full segmental compartment. Pseudovesicle absent or present in XIII. Prostate glands in XVI <i>–</i> XX, large, smooth, lobed (Figure 3 d). Prostatic duct long, U-shaped in XVII <i>–</i> XVIII, stouter toward distal end. Accessory glands absent. <i>DNA barcodes</i> GenBank accession numbers KU 232822 (WH 3 P 12, holotype), KU 232825, KU 232821, KU 232823 and KU 232824 (WH 3 P3, 11, 13 and 14, respectively). <i>Etymology</i> The name <i>douliouensis</i> is given to this species with reference to its type locality in Douliou, Yunlin, southwestern Taiwan. <i>Remarks</i> <i>Amynthas douliouensis</i> sp. nov. is only known from its type locality and the type locality of <i>A. quadriorbis</i> in the foothills near Douliou, Yunlin, southwestern Taiwan. The two type localities are only 1 km away from each other in areas where natural habitats have mostly been transformed into farmlands, and so <i>A. douliouensis</i> may also be considered as an endangered species like <i>A. quadriorbis</i>. <i>Amynthas douliouensis</i> is sexthecate with three pairs of spermathecae in VII <i>–</i> IX and belongs to the <i>sieboldi</i> species-group of the genus <i>Amynthas</i> (Sims and Easton 1972). It is most similar to <i>A. tungpuensis</i>, an endemic earthworm widely distributed in western Taiwan, based on the characters of setal numbers, simple male pore structure, stalked accessory glands and three pairs of spermathecae in VII <i>–</i> IX. The presence of stalked accessory glands in <i>A. tungpuensis</i> was neglected in the original description of Tsai et al. (1999). Despite these similarities, <i>A. tungpuensis</i> is morphologically separable from <i>A. douliouensis</i> because it has distinctive violet brown colouration with white setal rings and generally two transverse rows of papillae in presetal VIII and IX (Tsai et al. 1999). Molecular analyses also show that <i>A. douliouensis</i> is distinguishable specifically from <i>A. tungpuensis</i> (Figure 1). <i>Amynthas douliouensis</i> differs from the other members of the <i>sieboldi</i> -group primarily by its combined characters of simple male pore and unique papilla arrangements.
description: Published as part of <i>Shen, Huei-Ping, Chang, Chih-Han &amp; Chih, Wen-Jay, 2016, Four new earthworm species of the genus Amynthas (Megascolecidae: Oligochaeta) from southwestern Taiwan with re-description of Amynthas tungpuensis Tsai, Shen and Tsai, 1999, pp. 1889-1910 in Journal of Natural History 50 (29 - 30)</i> on pages 7-10, DOI: 10.1080/00222933.2016.1180721, http://zenodo.org/record/269053
description: {"references": ["Sims RW, Easton EG. 1972. A numerical revision of the earthworm genus Pheretima auct. (Megascolecidae: Oligochaeta) with the recognition of new genera and an appendix on the earthworms collected by the Royal Society North Borneo Expedition. Biol J Linn Soc. 4: 169 - 268.", "Tsai C-F, Shen H-P, Tsai S-C. 1999. On some new species of the pheretimoid earthworms (Oligochaeta: Megascolecidae) from Taiwan. J National Taiwan Mus. 52: 33 - 46."]}