Epeorus (Caucasiron) zagrosicus sp. nov., larva: A labrum (right half in dorsal view, left half in ventral view) B incisors of right mandible in ventral view C incisors of left mandible in ventral view (both flattened on slide) D setae on dorsal surface of femora E surface and posterior margin of abdominal tergum VII F gill I G gill III H–I abdominal segments VIII–X J sternum IX, female K sternum IX, male L gill VII (flattened on slide) M–O gill VII (in natural position from ventral view), variability in shape.