Elbenia (Aequapteron) appressa, Gorochov, 2023

Gorochov, A. V., 2023, Taxonomy of the katydids (Orthoptera: Tettigoniidae) from East Asia and adjacent islands. Communication 16, Far Eastern Entomologist 485, pp. 7-28 : 25-27

Elbenia (Aequapteron) appressa Gorochov, sp. n.

https://zoobank.org/NomenclaturalActs/ CD071663-C0B3-4799-9832-5F15AF9897D4

Figs 140–149

MATERIAL. Holotype – ♂, Malaysia, Borneo I., Sabah State, environs of Sepilok Town , forest, 1–6.II.2014, M. Berezin ( ZIN). Paratypes: 1 ♂, 1 ♀, same data as for holotype ( ZIN) .

DESCRIPTION. Male (holotype). General appearance similar to all species previously described here. Coloration uniformly greenish but having partly light brown basal areas in both dorsal tegminal fields (this area in left tegmen with brown most part of stridulatory vein and almost yellowish small medial part of this vein, but in right tegmen, this basal area with yellowish rose distomedial part and brown distolateral part), semitransparent membranes in mirror of right tegmen and in cells around this mirror, light brown to brown apices of some spines as well as apical parts of claws and cerci, and almost dark brown inner denticles of genital plate ( Figs 141–147 ). Structure of tegminal stridulatory apparatus as in Figs 140–142 ; last tergite with a pair of long and moderately thin posterior lobes which somewhat curved downwards, almost pressed to each other from bases to apical parts and with two short and angular (almost conical) projections at each apex (dorsoapical projection directed more or less backwards, but ventroapical one directed downwards/forwards; Figs 143, 145, 146 ); epiproct very small, triangularly oval, located between cercal bases; paraprocts barely larger, roundly plate-like; cerci short, rather strongly curved (hook-like) and with acute apices directed medially ( Figs 143, 144 ); genital plate rather simple, elongate (but not long), straight, slightly and gradually narrowing to rather narrowly rounded apex having distinct but short and very narrow posteromedian notch as well as a pair of vertically flattened and rather low posterolateral lobes (each lobe with posterior edge sinuate, i.e. having three very short apical lobules, and with strong acute denticle located on inner surface of this lobe near its apex and directed medially; Figs 143–147 ).

Variations. Paratype male with two yellowish marks on darkened part of left tegmen: small one on base of stridulatory vein dorsum, and somewhat larger spot near plectrum.

Female. Coloration and structure of body as in males but with following differences: darkened marks on tegmina and cerci absent; dorsal tegminal fields and abdominal apex ( Figs 148, 149 ) almost as in E. (E.) serraticauda in structure, but last sternite with more or less straight (not concave) posterior edge similar to that of E. (E.)?tenera (however, latter species with relatively shorter ovipositor: E.?tenera and new species having hind femur approximately 2.4 and 2 times as long as ovipositor, respectively).

Length (in mm). Body: ♂ 16–17, ♀ 21; body with wings: ♂ 37–39, ♀ 40; pronotum: ♂ 4–4.2, ♀ 4.4; tegmina: ♂ 28.5–30, ♀ 30; hind femora: ♂ 16.5–17.8, ♀ 18; ovipositor 9.

COMPARISON. The new species is very similar to the second species of this subgenus E. (A.) bispinosa but distinguished from it by the male last tergite lobes longer and almost pressed to each other (vs. these lobes are shorter and very widely separated from each other), and the male cerci more hooked (compare Figs 143–145 and 150–152 ).

ETYMOLOGY. This species name is the Latin word “appressa ” (pressed) due to the structure of the male last tergite lobes.

Figures

Figs 139–152. Elbenia: 139 – E. (Elbenia) eudigitata sp. n.; 140–149 – E. (Aequapteron) appressa sp. n.; 150–152 – E. (Ae.) bispinosa Karny. Teeth of left male stridulatory vein from below (139, 140); left (141) and right (142) dorsal fields of male tegmina; male abdominal apex from above (143, 150), from below (144, 151), from side and slightly below (145), and from side (152); distal parts of male last tergite lobes and male genital plate from side (146); apex of latter plate from behind (147); female last tergite with genital plate from below (148); female abdominal apex with ovipositor from side (149). [150–152, after Karny (1926a).]