Epeorus (Caucasiron) longimaculatus (Braasch, 1980)

Hrivniak, Ľubos, Sroka, Pavel, Bojkova, Jindriska & Godunko, Roman J., 2020, Identification guide to larvae of Caucasian Epeorus (Caucasiron) (Ephemeroptera, Heptageniidae), ZooKeys 986, pp. 1-53 : 1

Epeorus (Caucasiron) longimaculatus (Braasch, 1980) Figs 27 , 28 , 29

Iron longimaculatus Braasch, 1980

Epeorus (Caucasiron) longimaculatus (Braasch, 1980); in Kluge (2004)

Type locality.

Georgia, Mtskheta-Mtianeti Region, central Greater Caucasus, tributary of Aragvi River, 3 km above Pasanauri (1400-1500 m a.s.l.).

Distribution.

Georgia. Species endemic to the Greater Caucasus (Fig. 27 ).

Habitat.

Larvae inhabit small streams and rivers at middle altitude in the central Greater Caucasus. Altitudinal range of sampling sites 903-1193 m a.s.l. (Fig. 27 ).

Main morphological diagnostics of larvae.

(i) femora with elongated medial hypodermal spot (Fig. 28F-H ); (ii) setae on abdominal terga wide at base (Fig. 29E ); (iii) gill plates III without distinct projection (Fig. 29G ); (iv) gill plates VII (in natural position from ventral view) narrow (Figs 28L, M , 29H-L ); (v) denticles along posterior margin of tergum VII narrowed (Fig. 29E ); (vi) abdominal terga V-VII with narrowed triangular medial macula (Fig. 28I-K ); (vii) abdominal sterna without coloration pattern (Fig. 28B, N-P ); (viii) tergum X without postero-lateral projections (Fig. 29N ); (ix) shape of head of male ellipsoid (Fig. 28D ).

Remarks.

Taxonomy. This species described based on male subimago and larva collected in central Greater Caucasus ( Braasch 1980). The type series is currently deposited in SMNS. Larva associated with the subimago according to the coloration of abdomen. Male and female imagines not described.

Figures

Figure 27. Geographical (left) and vertical (right) distribution of Epeorus (Caucasiron) longimaculatus.

Figure 28. Epeorus (Caucasiron) longimaculatus, larva: A habitus in dorsal view B habitus in ventral view C habitus in lateral view D head of male in dorsal view E head of female in dorsal view F-H middle leg in dorsal view I-K abdominal terga L, M gills VII (in natural position from ventral view) N-P abdominal sterna II-VI.

Figure 29. Epeorus (Caucasiron) longimaculatus, 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 with detail of basally wide seta 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 sternum IX of female N abdominal segments VIII-X in lateral view.