Engonia minor Brunner von Wattenwyl, 1878

Fianco, Marcos, Szinwelski, Neucir & Faria, Luiz R. R., 2022, Katydids (Orthoptera: Tettigoniidae) from the Iguaçu National Park, Brazil, Zootaxa 5136 (1), pp. 1-72 : 27

Engonia minor Brunner von Wattenwyl, 1878

Fig. 10G, H ; 15D

Distribution: Argentina: Buenos Aires; Brazil: Minas Gerais, Paraná.

New record for the Paraná State.

Comments: Individuals are nocturnal, always sampled under the vegetation of understory, in bushes and shrubs. Males stridulate there, being easily found together with conspecific females. The species is relatively abundant inside the forest where is notable during aural observation.

Bioacoustics ( Fig. 12A–D ): The calling song is composed by a complex grouping of six to ten echemes. Each echeme begins with a crescendo intensity and closes with decrescendo intensity, being composed by 30 to 40 syllables. Each syllable is composed by three to five pulses, each one with smaller intensity than the anterior.

Dominant frequency: 11.4 ± 0.9 kHz.

Bandwidth: 7.4 ± 2.3 kHz.

Duration: Pulse: 0.002 ± 0.0008 s; Syllable: 0.018 ± 0.003 s; Echeme: 4.3 ± 0.8 s; sequency of echemes: 42.3 ± 3.4 s.

Mute interval: Pulse: 0.003 ± 0.001 s; Syllable: 0.08 ± 0.04 s; Echeme: 0.35 ± 0.17 s; Echeme sequence: 482 ± 125 s.

Figures

FIGURE 10. Species of Aniarae, Cosmophylla and Dysoniini (Phaneropterinae) from the ParNa Iguaçu. A: Aniarella minor, female; B: Aniarella typica, male; C and D: Hyperophora brasiliensis, male and female; E: Hyperophora gracilis, male; F: Hyperophora major, male; G and H: Engonia minor, male and female; I and J: Engonia sp. 1, male and female; K: Dysonia pirani, male.

FIGURE 12. Calling songs of species of Cosmophylla species (Phaneropterinae) from the ParNa Iguaçu.A–D: Engonia minor; E-H: Engonia sp. 1.; A and E: sonogram of a supersequence of echemes; B and F: sonogram of one sequence of echemes; B and G: sonogram of one echeme; D and H: spectrogram of the respective echeme.

FIGURE 15. Live specimens ofAniarae, Cosmophylla, Microcentrini and Odonturini (Phaneropterinae) from the ParNa Iguaçu. A: Aniarella typica, male; B: Hyperophora brasiliensis, male; C: Engonia minor, male; D: Engonia sp. 1, male; E: Anapolisia micromargaritifera; F: Microcentrum marginatum; G: Phillophyllia latior; H: P. venosa; I: Anisophya melanochloris, male; J: Xenicola xukrixi, female; all photos by Marcos Fianco.