A review of Oriental Rheotanytarsus Thienemann & Bause, with descriptions of some new species (Insecta, Diptera, Chironomidae) Rosina A. K. Kyerematen, Trond Andersen & Ole A. Saether Kyerematen, R. A. K., T. Andersen & O. A. Saether (2000): A review of Oriental Rheotanytarsus Thienemann & Bause, with descriptions of some new species (Insec-ta, Diptera, Chironomidae). -In: Baehr, M. & M. Spies (eds): Contributions to chironomid research in memory of Dr. Friedrich Reiss. -Spixiana 23/3: 225-258. Ten new Oriental species are described: R. falcatus as male and female, and R. beccus, falcipedius, koraensis, kuantanensis, pallidus, phaselus, sessilipersonatus, soelii, and verticillus as males only. Seven species are redescribed: R. addittis (Johannsen) and R. trivittatus (Johannsen) as male, female and pupa, R. adjectiis (Johannsen) as male and female, and R. acerbus (Johamisen), R. aestuarius (Tokunaga), R. madarihat-ensis, nom. nov. (for R. pelhicidus Chaudhuri & Datta, 1994 nee (Walker, 1848), and R. tamaqiiartus Sasa as males only. Specimens of R. curtistylus (Goetghebuer), R. reissi Lehmann, and R. oiieiitalis Moubayed were re-examhied. R. tobasqjtidecimus Kikuchi & Sasa, R. amamiflavus Sasa and R. okisimplex Sasa were re-examined from literatiire. Rheotanytarsus tumidus Chaudhuri & Datta is a junior synonym of R. aestuarius (Tokunaga). A lectotype is newly designated for R. additus (Johannsen). R. formosae Kieffer belongs in the genus Tanytarsus v. d. Wulp. The genus Rheotanytarsus has recently been tentaüvely divided into 18 species groups of which 10 occur in the Oriental region. Keys to males and pupae of described Oriental Rheotanytarsus are given, and zoogeography is discussed. Rosina A. K. Kyerematen, Department of Zoology, University of Ghana, P. O. Box 67, Legon, Ghana. Trond Andersen & Ole Anton Saether, Museum of Zoology, University of Ber-gen, N-5007 Bergen, Norway. Introduction The larvae of Rheotanytarsus are rheobiontic, filter-feeding using nets suspended between arms at the anterior end of their characteristic cases (Finder & Reiss 1983). The larvae Uve in moderately fast to moderately slow flowing rivers, streams, creeks and ponds. The larvae of the trivittatus group, how-ever, live in temporary, stagnant waters. The genus is particularly plentiful, both in numbers of species and in individuals, in tropical rain forests (Kyerematen 1996). Up to now 94 species of Rheotanytarsus have been described, from all zoogeographical regions except the Antarctic. In an unpublished manuscript by Saether & Kyerematen, the species were tentatively grouped into 21 more or less distinct groups of which 10 occur in the Oriental region. Prior to the present authors' review, sixteen described species had been recorded from this region, most of them also as pupae. In a previous paper (Kyerematen et al. 2000), the pelhicidus group was treated and R. minusculus Kyerematen described from Thailand. This group also includes two species previously 225
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