Glennagraecia curvicauda Ingrisch, 2023

Morris, Glenn K, Ingrisch, Sigfrid, Willemse, Fer, Willemse, Luc, De Luca, Paul A. & Klimas, Dita, 2025, Stridulation songs of some Tettigoniidae (Ensifera, Orthoptera) from Papua New Guinea, Zootaxa 5600 (1), pp. 1-81 : 61-62

Glennagraecia curvicauda Ingrisch, 2023

( Figs 65–67 )

Material studied. Holotype male: Papua New Guinea: Morobe, Wau, Mt. Kaindi , elev. 1230 m (7°21’0”S, 146°40’59.88”E), 30 viii 1981, coll. G.K. Morris, (Depository NBC Leiden) . Paratype female: same data as holotype.

Comments. The male of Glennagraecia curvicauda is “unique for its almost completely re-curved” cercus ( Fig 9F of Ingrisch 2023). These unusual cerci are evident even in the habitus photo of the live adult male holotype ( Fig. 65 ). Diagnosis of the G. curvicauda female includes a subgenital plate with “huge lateral expansions” (ibid. and see his Fig. 9B ), an apparent adaptation to complement the remarkable male cerci during copulation.

The pronotum of the male is dorsoventrally shallow and broadened, with a convex posteriorly rounded metazona covering the much-reduced tegminal strigin; pronotum with lateral projecting rounded humeral lobes “in about mid length” (ibid., Fig. 65 ).

Stridulation. Very short ultrasonic sinusoid pulses ( Fig. 67A–C ) and a relatively high-Q.

spectrum, peaking at 26–27 kHz ( Fig. 67D ), delivered (mostly) in pairs ( Fig. 67A ), which pair may be for convenience termed a song. Ten songs had a pulse period of 13.4 ms ( Fig. 67B ). Mean song period ( Fig 67A ) was 44.1 ms at temperatures in the low 20s. First and second pulses do not differ in their spectrum, i.e., there is no frequency modulation. This would appear to be elastic uncoupled stridulation in which each wave of the 26 kHz simple sine wave is generated by each successive tooth-scraper contact event and cuticular distortion of the scraper achieves low ultrasonics.

Figures

FIGURE 9. Habitus of types: A) Paraphyllomimus buergersi buergersi Beier (holotype male); B) P. buergersi wauensis ssp. nov. F. Willemse (paratype male); C) P. pipiens sp. nov. F. Willemse (holotype male).

FIGURE 65. Glennagraecia curvata Ingrisch et al., 2023: glistening habitus of adult male, hand indicates relatively small species. Field name ‘black frons hidden tegmina’.

FIGURE 66. Glennagraecia curvata stridulatory file on ventral surface of left tegmen.

FIGURE 67. Glennagraecia curvata acoustic analysis, another example of elastic stridulation: A) Excerpt from a series of mostly paired short pulses, well separated in time; B) One pulse pair at higher time resolution; C) high time resolution of single pulse in B shows markedly sinusoid/tonal waveform; D) Power spectrum of time sample in D indicates a single relatively high- Q carrier frequency peak in the ultrasonic near 28 kHz.