Homoeogryllus cf. reticulatus (Fabricius, 1781)

Zurawlew, Przemyslaw, Desutter-Grandcolas, Laure, Szymanski, Pawel & Herman, David Billy, 2020, New records of exotic crickets in Europe: Homoeogryllus species (Orthoptera: Gryllidea: Phalangopsidae), Journal of Orthoptera Research 29 (2), pp. 121-125 : 121

Homoeogryllus cf. reticulatus (Fabricius, 1781) Figs 1 , 2

Observed material.-

Belgium, Gent, 8 VIII 2010, 1♂, D. B. Herman leg., specimen not collected, identified based on its calling song.

Stridulation description .-

Only two stridulation series were recorded (Fig. 2a ). Each consisted of two fast introductory creaks separated by 30 ms pause and a number of chatter syllables with fundamental frequency ca. 4 kHz and harmonics (Fig. 2c ). Duration of the first stridulation with 8 syllables (Fig. 2b ) was 4.1 s and that with 5 syllables was 2.2 s. Both stridulations were separated by a 7.6 s pause.

Remark.-

The specimen was found in a crack of a wall near a port where the wood of tropical trees is stored. The species has been recorded in Egypt, Chad, Senegal, Guinea, Ivory Coast, Benin, Cameroon, Central African Republic, Equatorial Guinea, Gabon, Republic of the Congo, and Democratic Republic of Congo (= Zaire) ( Desutter 1985, Gorochov 2018).

Figures

Figure 1. Homoeogryllus cf. reticulatus (Fabricius, 1781). Male found in a crack of a wall near the port of Gent (Belgium) in which wood of tropical trees is stored.

Figure 2. Stridulation of Homoeogryllus cf. reticulatus (Fabricius, 1781) male from Gent (Belgium): a. spectrogram of two recorded stridulation series; b. spectrogram of one stridulation series in higher resolution of time domain; c. spectrogram of the beginning of stridulation series with three units (syllables) shown. The oscillograms are shown below and the relative amplitude scales (in dB) on the right of the spectrograms. Abbreviations: dB, decibel; s, second; kHz, kilohertz.