L. Forró szerk.: Miscellanea Zoologica Hungarica 12. 1998 (Budapest, 1998)

Ambrus, A., Juhász, P.; Bánkuti, K.: New Hungarian mayfly (Ephemeroptera) species arising from collectings of larvae

Family Neoephemeridae Neoephemera maxima (Joly, 1870) Sárvár: road number 84, Rába, 155 m XN43 07.05.1997, 8 females (2 mature), 1 mature male, A. Ambrus, K. Bánkuti, T. Kovács; 12.05.1998, 11 females (5 mature), 3 mature males, A. Ambrus, K. Bánkuti, T. Kovács. (The size of larvae without caudal filament and cerci: females 10,5-13,5 mm, average: 11,4 mm; males 9-10 mm, average 9,5 mm.) This species occurs in the Western European and Eastern European Plains and the eastern part of the Balkan Peninsula and in the Baltic countries. At both of the two collectings the species was caught in high numbers, and hence its population can be regarded stable. Most often the specimens were collected from branches, logs, and other floating debris, and only a few individuals were found on the algae-covered larger stones. The sampling site includes very diverse water habitats, as shown by the list of species collected here. From the sampled sections of Rába located upstream (Szakonyfalu, Magyarlak, Csákánydoroszló, Körmend) and downstream (Várkesző, Győr) of Sárvár we did not find this species. Among the water invertebrates collected with this species several are very rare or characteristic rheophilous species, preferring clear water. Hirudinea: Glossiphonia complanata, Caspiopdella fadejewi, Cystobranchus respirans, Erpobdella octoculata, Troche ta cylindrica; Mollusca: Theodoxus transversalis, Ancylus fluviatilis, Unio pictorum, Unio tumidus, Unio crassus, Anodonta cygnea, Sphaerium corneum; Ephemeroptera: Siphlonurus lacustris, Ametropus fragilis, Baetis fuscatus, Baetis rhodani, Centroptilum luteolum, Heptagenia flava, Heptagenia longicauda, Heptagenia sulphurea, Paraleptophlebia submarginata, Habrophlebia fusca, Habrophlebia lauta, Potamanthus luteus, Ephemerella ignita, Ephemerella notata; Odonata: Calopteryx splendens, Platycnemis pennipes, Stylurus flavipes, Gomphus vulgatissimus, Ophiogomphus cecilia, Onychogomphus forcipatus; Heteroptera: Aphelocheirus aestivalis; Coleoptera: Macronychus quadrituderculatus. Family Caenidae Brachycercus minutus Tshernova, 1952 Drávaszabolcs: road number 58, Dráva BR87 17.09.1997, 4, K. Bánkuti, T. Kovács, A. Varga - Tivadar: lido, Tisza FUI

2 04.10.1995, 1,1. Turcsányi. A species of Palearctic distribution. The specimens were collected from the bottom or the organic sediment accumulated there. Discussion The occurrence of the 12 species discussed in this paper was expected on the basis of their distribution. An exception is Neoephemera maxima. The map (Fig. 2.) illustrates those areas - water bodies - where the new species were found. Highest number of new species was recorded on the Upper Tisza (7 species): Baetis gracilis, Baetis scambus, Baetis vardarensis, Pseudocentroptilum pulchrum, Rhithrogena beskidensis, Electrogena fascioculata, Brachycercus minutus; this is followed by the River Rába (6 species): Baetis vardarensis, Pseudocentroptilum pulchrum, Rhithrogena beskidensis, Electrogena fascioculata, Ephemerella mesoleuca, Neoephemera maxima; then River Gyöngyös (3 species): Rhithrogena beskidensis, Electrogena fascioculata, Ephemerella mucronata; the Dráva (2 species): Pseudocentroptilum nanum, Brachycercus minutus; the