L. Forró szerk.: Miscellanea Zoologica Hungarica 10. 1995 (Budapest, 1995)

Nesemann, H., Pöckl, M.; Wittmann, K. J.: Distribution of epigean Malacostraca in the middle and upper Danube (Hungary, Austria, Germany)

Fig. 7. Distribution of Orconectes limosus in the middle and upper Danube (with watershed) 1914). It was found in stagnant backwaters of Vienna, which seem to be the westernmost record. In Hungary, the species is widespread and locally of high abundance, especially in the rivers Danube and Tisza (Thuránszky & Forró 1987). A. leptodactylus was collected in the river Tisza near Sarud and its alluvial floodplain (Hortobágy: Németéri főcsatorna near Nagyiván) in 1991. Surprisingly, even in the main course of the Danube, specimens of this crayfish were caught as high upstream as Leányfalu (rkm 1672). South of Budapest it appears to be more numerous, e. g. at Harta. In contrast to Orconectes limosus, which inhabits the shallow waters along the stony banks of the river, A. leptodactylus prefers the more precipitous parts of the bank and bottom, which never fall dry, even at low water levels. The species is a typical member of the potamon biocoenosis and is restricted to running and stagnant waters of the lowlands. Family Cambaridae Orconectes limosus (Rafinesque, 1817) Material: Danube at Dunaföldvár, 05. 09. 1991; Danube at Dunaújváros, 05. 09. 1991; Danube at Csillaghegy near Budapest, 04. 09. 1991; Szentendrei Duna at Leányfalu, 4. 09. 1991, leg. Ofenböck, T. & H. Nesemann; Danube near Újpest at the Népsziget, 20. 10. 1988, leg. Forró, L. & H. Nesemann; Danube port Ölhafen near Vienna (rkm 1918), 09. 1991, leg. Nesemann, H., Dorninger, C. & K. J. Wittmann, 9. 07. 1992; Danube in a side43ranch near Tegernheim, 30. 09. 1990; Danube at Menning, 3. IL 1985; Danube at Marching, 3. 11. 1985; Morava (March) near Schlosshof, 08. 1990, leg. Nesemann, H..