Epeorus (Caucasiron) alborzicus Hrivniak & Sroka, 2020 Figs 39, 40, 41

Type locality.

Iran, Mazandaran Province, Panjab village, unnamed brook (left tributary of Haraz River); 36°05'52.818"N / 52°15'15.987"E (locality no. 152); 955 m a.s.l.

Distribution.

Northern Iran. Species endemic to the Alborz Mountains (Fig. 39).

Habitat.

Larvae inhabit small rivers at middle and high altitude in the central Alborz. Altitudinal range of sampling sites 750-2438 m a.s.l. (Fig. 39). Most frequently found at altitudes above 1000 m a.s.l. At high altitudes often syntopic with E. (C.) iranicus .

Main morphological diagnostics of larvae.

(i) abdominal terga as on Fig. 40H, I; (ii) abdominal sterna II-VI with circular central medial macula of various intensity (Fig. 40B, L-N); (iii) tergum X with postero-lateral projections (Fig. 41K, arrow), (iv) femora without medial hypodermal spot (Fig. 40F, G); (v) gill plates VII (in natural position from ventral view) wide (Figs 40J, K, 41H-J); (vi) setae on abdominal terga hair-like (Fig. 41E); (vii) gill plates III with well-developed projection (Fig. 41G).

Remarks.

Taxonomy. This species was described based on larvae collected from Alborz Mts. (Hrivniak et al. 2020a). Imagines not described.

The type series is currently deposited in SMNS, IECA, and Natural History Museum and Genetic Resources, Department of Environment, Tehran, Iran (MMTT_DOE).