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- W3141770220 abstract "Altogether 82 specimens belonging to the famly Enchytraeidae, Oligochaeta,were collected from the Glacier Jaoguo of Tibetan Plateau at 4,600 m altitude dur-ing 1973--1975. These ice worms are foutd to belong to a new genus and species.Sinenchytraeus Liang et Hsu, gen. nov. Setae sigmoid, simple pointed, with ncdulusf Head pore at the apex of prosto-mium. Dorsal pores absent.Four pairs of septal glands. Digestive tract simple,oesophagus. merging gradually into the intestine. Peptonephridia and intestinal di- verticula absent. Coelomcytes of one type only. Nephridia with well developed in-terstitial tissue, postseptale large, bilobed, with efferent duct of postero-ventral ori-gin. Testes deeply divided, forming a number of distinct lobes. Testis sacs present.Male funnel cylindrical, glandular portion in front of the septum. Atria absent.Penial bulbs with penial glands only. Sperm sacs and egg sacs present. No sper-mathecae. With regard to the position of head pore, the feature of setae, and the presenceof well-developed egg sacs, the new genus is related to the genus Mesenchytraeus.It differs from the latter in having solid .nephridia, lobed testes enelosed by testissacs, simpler penial bulbs merely possessing penial glands, greater number of septalglands and in the absence of spermathecae. Type species: Sinenchytraeus glacialis Liang et Hsu Sinenchytraeus glacialis Liang et Hsu, sp. nov.(Text-figs. 1--2; Pls. Ⅰ--Ⅱ) Length 15.5--20.8 mm (Bolotype: 20mm) (preserved), width 0.8 mm (Holo-type: 0.8 mm,segments 48--56 (Holotype: 56). Colour black. Both dorsal and ven-tral. setae from Ⅱ onwards, with dorsal setae 1--2 and ventral setae 2--5 per bundle,Setae markedly sigmoid, those in a bundle approximately equal in size, about 90μlong by 5.0--5.2 μ thick, with nodulous distal fourth. Clitellum in Ⅻ (Ⅺ--ⅩⅢ).Male pores situated on the papillae of the ventro-lateral sides of Ⅻ. Female poresin the rear of intersegmental furrow 12/13. Brain slightly incised posteriorly.Septal .glands 4 pairs in Ⅳ--Ⅶ. Dorsal vessel originating from Ⅹ--ⅩⅢ. Coe-lomocytes of one kind, ellipsoid or irregular in shape, with nucleus. Nephridia be-ginning in Ⅶ, anteseptale consisting of funnel and a few interstitial tissue; post-septal portion with well developed interstitial tissue and divided into 2 lobes, dorsallobe larger than ventral, efferent duct usually arising in postero-ventral region of theventral lobe. Testes in Ⅺ, large, divided. into finger-like lobes, enclosed in testissacs. Seminal funnel cylindrical, glandular portion in front of the septum 11/12,ineasuring about 289--383μ long by 114--125μ wide, opening somewhat lateral, with2 lips of approximately the same size. Fu?nels usually extending backwards to ⅩⅢand enclosed by the sperm sacs. Vasa deferentia about 894--1,595μ long by 18-26 μ thick. Atria and prostates absent. Tenial bulb simple, with 3 pairs of penialglands. Sperm sacs and egg sacs paired, extending to ⅩⅪ when fully developed.Type specimens are daposited in the Department of Biology, Nanjing University." @default.
- W3141770220 created "2021-04-13" @default.
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- W3141770220 date "1979-01-01" @default.
- W3141770220 modified "2023-09-26" @default.
- W3141770220 title "A NEW GENUS AND SPECIES OF ENCHYTRAEIDAE FROM TIBET" @default.
- W3141770220 hasPublicationYear "1979" @default.
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