taxonID	type	description	language	source
D1328780BD60AE6EFD9FFF1DFED4FEEA.taxon	description	Oscillographic structure of the male call of Besdolus ventralis – The following description is based on three calls of one male specimen of Besdolus ventralis. Each of the recorded three calls was composed of three beat groups (Fig. 1 A). Beat groups consisted of 3 – 6 beats (Fig. 1 B – D). In each beat group, beats were repeated with decreasing inter-beat intervals, and the first two beats had much higher amplitude than the following, low-amplitude ones. For inter-beat intervals, number of beats per group and inter-group intervals, see Table 1. Call duration varied between 496 – 549 ms. Calls were recorded at ambient air temperatures 18.7 (call 1) and 20.4 (call 2 – 3) ° C.	en	Orci, Kirill Márk, Kovács, Tibor, Murányi, Dávid (2022): A Description Of The Male Drumming Call Of Besdolus Ventralis (Pictet, 1841) (Plecoptera: Perlodidae). Acta Zoologica Academiae Scientiarum Hungaricae 68 (2): 183-188, DOI: 10.17109/AZH.68.2.183.2022, URL: http://dx.doi.org/10.17109/azh.68.2.183.2022
D1328780BD60AE6EFD9FFF1DFED4FEEA.taxon	discussion	DISCUSSION The male drumming calls of the examined Besdolus ventralis specimen consisted of 3 beat groups, and each beat group contained 3 - 6 beats repeated with decreasing inter-beat intervals. Based on these features, the male call of this species can be categorised as a grouped call showing varied beat interval patterns within each group using the stonefly drumming signal terminology proposed by SANDBERG et al. (2015). Besdolus ventralis is the third species in the genus to which we now have detailed information about the oscillographic pattern of the male call. It is clearly different from the diphasic signal pattern reported for B. ravizzarum (RUFFONI & TIERNO DE FIGUEROA 2019), but very similar to the calls described for B. bicolor (TIERNO DE FIGUEROA et al. 2013). The main difference between the male calls of the latter two species seems to be that B. ventralis produces 3 – 6 beats per group, while B. bicolor is reported to produce only 2 (rarely 3) beats per beat group. However, that difference cannot be seen in low time-resolution oscillograms that show only the two initial, high amplitude beats of each group (Fig. 1 A). The similarity of the male call of the two species is in accordance with their close phylogenetic relationship suggested by molecular genetic results based on the examination of a mitochondrial marker (FOCHETTI et al. 2011). In order to clarify the relationship of the two taxa, it will be essential to record the male-female duet in both species since the timing and pattern of the female answer may also vary between closely related species (RUPPRECHT 1997), and this can be of critical importance regarding reproductive isolation. Further studies will be needed to reveal the intra-specific variation of the male call of B. ventralis, not only by examining more specimens, but especially to compare the signals of the two populations occurring in the Raba-Lafnitz river system (Austria, Hungary) and the Aliakmonas river (Greece).	en	Orci, Kirill Márk, Kovács, Tibor, Murányi, Dávid (2022): A Description Of The Male Drumming Call Of Besdolus Ventralis (Pictet, 1841) (Plecoptera: Perlodidae). Acta Zoologica Academiae Scientiarum Hungaricae 68 (2): 183-188, DOI: 10.17109/AZH.68.2.183.2022, URL: http://dx.doi.org/10.17109/azh.68.2.183.2022
