By Pietro Omodeo (auth.), Ralph O. Brinkhurst, Robert J. Diaz (eds.)
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Extra resources for Aquatic Oligochaeta: Proceedings of the Third International Symposium on Aquatic Oligochaeta held in Hamburg, Germany September 29-October 4, 1985
Example text
African endemites among the Naididae are (up to now): Two recently described Homochaeta species (H. proboscidea Grimm, 1985 and H. africana Grimm, 1985), Nais africana Brinkhurst, 1966, 31 Branchiodrilus c1eistochaeta Dahl, 1957, Dero oblongata Grimm, 1985, A ulophorus ghanensis Hrabe, 1966, Allodero bauchiensis (Stephenson, 1930) and Pristina rotundirostrisGrimm, 1985. It is still doubtful whether Aulophorus africanus Michaelsen, 1914 is an African endemite, because in my opinion this species is identical with A.
The ejaculatory duct ends in the penis which is surrounded by the atrium of the muscular bursa. Lateral, epidermal glandular areas are located on trunk segments 8 and 9 (Fig. 3a). Each glandular area consists of 15 to 30 pyriform cells. The cell bodies are located subepidermally but external to the longitudinal muscle layer and are surrounded by a membrane. m in diamter, stain strongly with the PAS reaction and pack the ectal regions of the cells and their respective ducts. These glandular areas are present in C.
Up to now there are no references to this special shape of needle setae in the literature. I consider the feature "bifid needles" and the fact that all the other morphological characteristics correspond to a very large extent with those of the "normal" N. variabilis to be decisive for the assignment of the animals under discussion. The original material of Nais raviensis Stephenson, 1914 was checked and though it is in very poor condition, it clearly belongs to the genus Dero (Grimm, 1985a). Dero raviensis has a very small branchial organ, hardly visible in the contracted condition.