Chaetogaster diaphanus Gruithuisen 1828

• Main Authors: Cui, Yongde, He, Xuebao, Peng, Yu, Wang, Hongzhu
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Clitellata; Haplotaxida; Tubificidae; Chaetogaster; Chaetogaster diaphanus; Indian; Stephenson; Vasa; Great Wall Station; Hanka; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.5256393; https://zenodo.org/record/5256393

1. Chaetogaster diaphanus (Gruithuisen, 1828) (Figure 2) Chaetogaster diaphanus (Gruithuisen). Chen 1940: 29–31; Liang 1964: 643 –644, 1979: 274; Wang 2002: 80; Timm & Všivkova 2007: 26; Cui 2008: 60. Material examined. Lhasa River: ST 12, 1 specimen (spm). Niyang River: ST 30, 1 spm; ST 31, 1 spm; ST 32, 1 spm. Lalu Wetland: ST 62, 3 spms. Description of new material . Length 2.4–5.0 mm, width 0.8–1.0 mm, segments 10–15. No eyes. Prostomium inconspicuous. Pharynx developed, with thick muscle layer, pharyngeal glands in II–IV. Oesophagus narrow in IV. Stomach in V–VI, and dilatation sudden in V. Stomachal plexus forming transverse ducts only anteriorly. No dorsal chaetae. Ventral chaetae (Fig. 2 A–C) of II 9 per bundle, 225–238 Μm long, about 4.5 Μm thick, upper prong longer than lower, with distal or median nodulus; from III on 7–11 per bundle, 174–221 Μm long, about 3 Μm thick, upper prong curved, longer and thinner than lower, with almost median nodulus. Penial chaetae (Fig. 2 D–F; Fig. 2 G, pc) 7 per bundle, about 112 Μm long, 4 Μm thick, simple-pointed or with 2–3 short fine teeth, with distal nodulus. Male pores paired in line with ventral chaetae, middle VI. Spermathecal pore paired in line with ventral chaeta, anterior to mid-V. Clitellum in 1 / 2 V–VI. Male genitalia paired in V–VI. Male funnel (Fig. 2 G, sf) cup-shaped, 80 Μm long, 84 Μm wide, with 12.5 Μm thick wall. Vasa deferentia (Fig. 2 G, vd) short, 28 Μm wide, joining atria apically. Atrial ampulla (Fig. 2 G, at) large, round, 168 Μm long, 144 Μm in diameter, 17.5–22.5 Μm thick wall, with sperm masses (Fig. 2 G, sm) in lumina. Spermathecal ampulla (Fig. 2 G, sa) pear-shaped, about 75 Μm long, 87 Μm wide, with 10 Μm thick wall, ducts very short. Remarks. This species is widely distributed in China (Wang & Cui 2007) and has also been recorded from Tibet by Stephenson (1909). The new material conforms to previous descriptions in most aspects except the body width and the number of penial chaetae (Chen 1940; Sperber 1948; Timm 1999). The new specimens are thicker than previously collected material from China (Liang 1964), but within the range given by Timm (2009) for European specimens. In our specimens there are usually 7 penial chaetae per bundle, whereas in previous descriptions there are only 3–5 per bundle (Chen 1940; Sperber 1948; Liang 1964; Brinkhurst & Jamieson 1971; Timm 1999). : Published as part of Cui, Yongde, He, Xuebao, Peng, Yu & Wang, Hongzhu, 2015, Records of Naididae and Lumbriculidae (Clitellata) from Tibet, China, with description of a new species of Nais, pp. 513-530 in Zootaxa 3956 (4) on pages 517-518, DOI: 10.11646/zootaxa.3956.4.4, http://zenodo.org/record/240764 : {"references": ["Liang, Y. L. (1964) Studies on the aquatic Oligochaeta of China II. On some species of Naididae from Sinkiang with description of a new species Allodero prosetosa. Acta Zoologica Sinica, 16, 643 - 652. [in Chinese with English abstract]", "Wang, H. Z. (2002) Studies on taxonomy, distribution and ecology of microdrile oligochaetes of China, with description of two new species from the vicinity of the Great Wall Station of China, Antarctica. Higher Education Press, Beijing, 228 pp. [in Chinese with English abstract]", "Timm, T. & Vsivkova, T. S. (2007) Freshwater oligochaetes (Annelida, Clitellata) of Lake Hanka (Russia / China). Acta Hydrobiologica Sinica, 31, 25 - 35.", "Cui, Y. D. (2008) Studies on Oligochaeta (Annelida) of Lakes in Yunnan, Southwest China. PhD Thesis, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 200 pp. [in Chinese with English abstract]", "Wang, H. Z. & Cui, Y. D. (2007) On the studies of microdrile Oligochaeta and Aeolosomatidae (Annelida) in China: brief history and species checklist. Acta Hydrobiologica Sinica, 31 (Supplement), 87 - 98.", "Stephenson, J. (1909) Report on a collection of smaller Oligochaeta made by Captain, F. H. & Stewart, I. M. S., in Tibet. Records of the Indian Museum, 3, 105 - 114.", "Sperber, C. (1948) A taxonomical study of the Naididae. Zoologiska bidrag fran Uppsala, 28, 1 - 296.", "Timm, T. (1999) A guide to the Estonian Annelida. Estonian Academy Publishers, Tartu-Tallinn, 208 pp.", "Timm, T. (2009) A guide to the freshwater Oligochaeta and Polychaeta of Northern and Central Europe. Lauterbornia, 66, 1 - 235.", "Brinkhurst, R. O. & Jamieson, B. G. M. (1971) Aquatic Oligochaeta of the World. Oliver and Boyd, Edinburgh, 860 pp."]}