Two aberrant Tubificidae (Oligochaeta) from Pearl River in the People's Republic of China

Abstract

The enigmatic Ilyodrilus masrix Brinkhurst, 1978, and Tectidrilus achaetus sp.nov. are described from the Guangzhou Reach of Pearl River, southern China. The first species is characterized by its greatly enlarged, eversible, feeding apparatus, and was previously known only from British Columbia, Canada. Tectidrilus achaetus is unique within the Tubificidae by lacking setae. A slightly modified definition of the, otherwise marine, genus Tectidrilus Erstus, 1982 is provided.

A preliminary study of oligochaetes in Poyang Lake, the largest freshwater lake of China, and its vicinity, with description of a new species of Limnodrilus

“…The new material fits the recent revision of T. mastix by Ohtaka & Nishino (1999), but the blunt teeth of some anterior chaetae are reported for the first time in this species. In the material from Zhujiang, the bifid chaetae of segment II were stated to be stout with upper teeth shorter than lower (Erséus & Qi, 1985;Ohtaka & Nishino, 1999), but the corresponding chaetae of the present specimens are hardly thicker than those of other segments, and their teeth are either modified or unmodified.…”

“…Bifids in II, (1) 2 per bundle, somewhat stout or normal, with sharp or blunt teeth (Fig. 4 F-G); those in III (0) Remarks: This species is widespread in Zhujiang (Pearl) River and the lakes along Changjiang (Erséus & Qi, 1985;Liang, et al, 1995). The new material fits the recent revision of T. mastix by Ohtaka & Nishino (1999), but the blunt teeth of some anterior chaetae are reported for the first time in this species.…”

Studies on the Aquatic Oligochaete Fauna in Lake Biwa, Central Japan I. Checklist with Taxonomic Remarks.

“…All of the present specimens examined had no spermatheca as in the original description. In addition, the male duct was also often missing just as pointed out by ERSEUS and QI (1985) for Chinese specimens. (Fig.…”

“…North America (BRINKHURST, 1978(BRINKHURST, , 1986, China ERSEus and QI, 1985;QI, 1987), and now from Japan. It is widespread in Lake Biwa, occurring from the littoral to the deep profundal (NISHINO et al, unpubl.).…”

Potamothrix scleropenis sp. nov. (Oligochaeta: Tubificidae) from Fuxian Lake, the Deepest Lake in Southwest China

“…Previous studies of freshwater oligochaetes in China have mainly been conducted in the east, whence 28 species and 14 genera of Tubificidae have been recorded so far (Chen, 1940;Liang, 1962, 1979, Erséus and Qi, 1985Brinkhurst et al ., 1990;Liang and Xie, 1997;Wang and Liang, 2001;Wang, 2002). Few taxa were hitherto known from the west.…”