Zwicknia acuta Murányi & Orci, 2014

Murányi, Dávid, Kovács, Tibor & Orci, Kirill Márk, 2014, New country records and further data to the stonefly (Plecoptera) fauna of southeast Macedonia, Ecologica Montenegrina 1 (2), pp. 64-77 : 70-71

Zwicknia acuta Murányi & Orci, 2014 (in: Murányi et al. 2014)

( Fig. 4A–B )

Macedonia: Valandovo municipality, Belasica Mts , Bašibos, Anska Reka at Kočuli settlement, 310 m, N41°18.658’ E22°41.717’, 20.02.2014, leg. DA, LD, TK, DM: 2♂ ( HNHM: PLP4586 ), 1♂ ( HNHM: PLP4587 ; drumming recorded), 3♂ 1♀ ( MM: 2014-30); Valandovo municipality, Belasica Mts , Bašibos, Karani Stream NE of the village, 400 m, N41°19.076’ E22°42.434’, 20.02.2014, leg. DA, LD, TK, DM: 1♀ ( MM: 2014-31) .

This species was described very recently from Austria, Germany, Hungary, Serbia and Slovakia. It seems to be a species of larger and permanent streams. New to the fauna of Macedonia.

Both the epiproct morphology ( Fig. 4A ) and drumming call characters (mean inter beat interval, number of beats per call, call duration, number of calls in a sequence, inter call interval) slightly differ from typical ones described from the Carpathian Basin, but still fit within the variability of the species (compare Figs. 80, 108– 109, 121, 127–130, 166, 174–178 in Murányi et al. 2014).

All together 15 calls were recorded. Calls were produced in short call sequences containing 2-3 calls per sequence. Each call is series of 4-6 beats (mean number of beats per call is 5.1, n=14 calls; one aberrant call with only two beats were excluded from this and all other call parameter measurements). Within a call beats were repeated with gradually increasing inter beat intervals (mean values of individual inter beat intervals varied between102-161 ms, overall mean inter beat interval was 128.3, n=14). Inter call interval varied between 700-2500 ms (mean=1235.8, n=7).

Figures

Figure 4. Macedonian specimen ofZwicknia acutaMurányi & Orci, 2014:A – male epiproct, lateral view, scale bar 0.5 mm;B – oscillogram showing a sequence of three calls, ambient air temperature was 18.2oC during the recording.