Epeorus (Caucasiron) hyrcanicus, sp. nov., larva A labrum (left half in ventral view, right half in dorsal view) B incisors of left mandible C incisors of right mandible D setae on dorsal surface of femora E surface and posterior margin of abdominal tergum VII F gill I G gill III H gill VII (flattened on slide) I–K gill VII (in natural position from ventral view) L, M abdominal segments VIII–X in lateral view (arrow points on postero-lateral projection) N sternum IX of female.