Epeorus (Caucasiron) znojkoi, larva: A labrum (left half in dorsal view, right half in ventral 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 and its variability F gill I G gill III H gill VII (flattened on slide) I–L gill VII (in natural position from ventral view), variability in shape M, N abdominal segments VIII–X in lateral view (arrow points on postero-lateral projection) O sternum IX of female with observed variability.