NEW DATA OF POORLY KNOWN SPECIES GAMMARUS ORIENTALIS (S. KARAMAN, 1934) (FAMILY GAMMARIDAE) FROM ASIA MINOR (CONTRIBUTION TO THE KNOWLEDGE OF THE AMPHIPODA 292)

The poorly known taxon Gammarus orientalis (S. Karaman, 1934), described and known from Derbend in Erdschias-dag Mts (=Erciyas-dagi), on 2100 m about sea level (Asia Minor) is described and figured based on holotype and paratypes. As the known taxonomic characters of this taxon were scarce and incomplete, this taxon was considered the synonym of Gammarus balcanicus Schäferna, 1922. The established morphological characters and geographical distribution of orientalis support distinct status of this taxon.