Rhytidaspis camela, Ingrisch, 2019

Ingrisch, Sigfrid, 2019, Revision of the genus Rhytidaspis Redtenbacher, 1891 including the description of a new genus Haudrhytidaspis gen. nov. (Orthoptera: Tettigoniidae: Conocephalinae), Zootaxa 4661 (2), pp. 343-370 : 352-353

Rhytidaspis camela sp. n.

Figs. 1 H–I, 2N, 3M–N, 4B–C, 5D–E, 6C–D, 7H–J, 8E–F, 9F, 10I–J

Holotype (male): Indonesia, Papua Barat: NW New Guinea, NW Sorong, [0°50’S, 131°15’E], 23.viii.1948, leg. M.A. Lieftinck (Naturalis Leiden, NBC).

Other specimens studied: Indonesia: Papua Barat, North Manokwari, Komara [Komaza on label], [0°49’S 134°1’E], 1–28.ii.1953, leg. kren. mevr. Mareus v. A. Nieuwenhuisen— 1 male (paratype, NBC) .

Diagnosis. The new species in unique for the shape of the titillators that have the central curvature not U-shaped but nearly right-angled and the granular extension on top of that curvature laterally inflated and interrupted by a trough, while in all other species of the genus the central area of the titillators have a narrow U- or V-shaped curvature and the granular extension laterally compressed. The male cerci have the apical margin of the dorso-apical lobe flattened with the internal proximal angle moderately projecting but not separated from the remainder of the apical margin nor otherwise modified as in most other species of the genus except for R. nigropunctata sp. n., which differs however by differently shaped titillators and strikingly different coloration.

Description. Fastigium verticis before eyes 2.5 mm; fastigium verticis from base 3.0 mm; dorsal eye length 1.9 mm; greatest diameter of eye 1.8 mm; fastigium verticis up-curved, with tubercle at [dorsal] base; laterally compressed, apex faintly hooked.

Male. Stridulatory file sinuate, 2.7–3.0 mm long; teeth not very dense, wider than in the other species and mostly brown, at apex dense; with 90–105 teeth, in middle of file with 27.6–29.5 teeth per mm ( Figs. 4 B–C). Mirror on elevated disc; anterior and external margins curved, posterior margin angular; 1.3–1.5 mm long 1.9 mm wide ( Figs. 3 M–N). Titillators stout-elongate at base, then forming an S-curve and afterwards straight to tip. From between middle of the S to more than half of the straight area with a huge, sub-sclerotized granular extension that is laterally inflated and covered by fine denticles, behind mid length it is interrupted by a deep transverse furrow and raised again in apical quarter; this structure is followed by a rather short stout trunk that little narrows in middle and widens again to rounded apical area, which is covered by robust black teeth ( Figs. 8 E–F, 9F, 10I–J). In apical area, at dorso-proximal side, there is a narrow, compressed, sub-angular, elongate apical sclerite that is little surpassing the widened tip of the main titillator branch ( Fig. 8E ). The apico-lateral sclerites are rather large, roughly oval but little curved.

Coloration. Head, pronotum and legs reddish brown with black ornaments ( Figs. 1 H–I). Face dark red brown, antennal scrobae, scapus and pedicellus black, flagellum orange or yellow; sub-ocular carina red brown or darkened, mandibles, labrum and upper part of clypeus medium red brown, lower part of clypeus green, palpi yellowish ( Fig. 2N ); Vertex red brown, dorsal surface of fastigium verticis black with light tip. Pronotum red brown. Abdominal tergites yellowish to orange brown along midline with black hind margin and dark brown to black lateral bands. Meso- and metasternum black; abdominal sternites yellow or brown. Tegmen yellow with few scattered black dots ( Figs. 3 M–N). Legs medium reddish brown; coxa and trochanter of all legs dark brown or black, anterior and median femur with black transverse strokes (in holotype little distinct), hind femur for almost basal half dark reddish brown (in holotype) or black. Projections of male tenth abdominal tergite and cerci orange yellow. Male subgenital plate black except at very base; styli black with yellow tip.

Measurements (2 males).—Body: 39–42; pronotum: 12.5; tegmen: 6.0–6.5; hind femur: 24.5–25.0; anterior femur: 13.0– 13.5 mm.

Etymology. Named for the shape of the male titillators that in lateral view resemble the shape of a two-humped camel; from Latin camela female camel, noun in apposition.

Figures

FIGURE 1. A–B, Rhytidaspis picta Redt., 1891 (A, male Fakfak; B, female Arguni); C, R. ornata sp. n. (male South N.G.); D–E, R. variata variata ssp. n. male (Nabire); F–G, R. nigropunctata sp. n., male (Mt. Nok); H–I, R. camela sp. n., male (Sorong); J–K, R. arfak sp. n., (J, female Siwi; K, male Koffo); L, R. genyem sp. n. female (Genyem); M, R. variata brevis ssp. n. male (Freeport); N, Haudrhytidaspis fusca (Karny, 1911) comb. nov. female (type).—Habitus dorsal view (A, C, E–F, H, K, M–N) and lateral view (B, D, G, I–J, L). Scales 10 mm.

FIGURE 2. Face of A–B, Rhytidaspis variata meja ssp. n. (A, male Tafelberg; B, female Dorey); C–E, R. arfak sp. n. (C, male Koffo; D, male Siwi; E, female Siwi); F, R. variata brevis ssp. n. male (Freeport); G, R. variata variata ssp. n. (male Nabire); H–J, R. picta Redt., 1891 (H, male Fakfak; I, female Arguni; J, male Bundi); K–M, R. ornata sp. n. (K, male South N.G.; L, male Mindiptana; M, male Tiel); N, R. camela sp. n. (male Sorong); O, R. nigropunctata sp. n. (male Mt. Nok); P, R. genyem sp. n. (female Genyem); Q, Haudrhytidaspis fusca (Karny, 1911) comb. nov. (female type). Scales 10 mm. The arrows point at the sub-ocular carina, present in Rhytidaspis, absent in Haudrhytidaspis.

FIGURE 3. Left and right male tegmina of A–D, Rhytidaspis picta Redt., 1891 (A–B, Fakfak; C–D, Banda); E–F, R. arfak sp. n. (Koffo); G–H, R. variata meja ssp. n. (Tafelberg); I–J, R. variata variata ssp. n. (Nabire); K–L, R. variata brevis ssp. n. (Freeport); M–N, R. camela sp. n. (Sorong); O–P, R. nigropunctata sp. n. (Mt. Nok); Q–R, R. arfak sp. n. (Siwi); S–X, R. ornata sp. n. (S–T, South N.G.; U–V, Mindiptana; W–X, Tiel); Y, stridulatory file on underside of left tegmen of R. picta Redt., 1891 (Fakfak). Scales 5 mm, in Y 1 mm.

FIGURE 4. Stridulatory file on underside of left tegmen of A, Rhytidaspis arfak sp. n. (Koffo); B–C, R. camela sp. n. (B, Sorong; C, Komara); D, R. variata meja ssp. n. (Tafelberg); E, R. variata variata ssp. n. (Nabire); F, R. variata brevis ssp. n. (Freeport); G, R. nigropunctata sp. n. (Mt. Nok); H–J, R. ornata sp. n. (H, South N.G.; I, Mindiptana; J, Tiel).

FIGURE 8. Male titillators in lateral or oblique lateral view (A in internal, B in external view; E left in internal, right in top view): A–C, Rhytidaspis arfak sp. n. (A–B, Siwi; C, Koffo); D, R. picta Redt., 1891 (Fakfak); E–F, R. camela sp. n. (E, Sorong; F, Komara); G, R. nigropunctata sp. n. (Mt. Nok); H–J, R. ornata sp. n. (H, Tiel; I, Mindiptana; J, South N.G.); K, R. variata variata ssp. n. (Nabire); L–M, R. variata meja ssp. n. (L, Tafelberg; M, Dorey); N, R. variata brevis ssp. n. (Freeport).—Abbreviations: ap apical projection of granular sac, as oval apico-lateral sclerite, at apical branch of titillator, ea elongate apical sclerite, gs granular sac on top of U-shaped fold, ms basal muscular sac, ti base of titillator.—Tip of titillator is on top (A–F, H–K); tip is right (G, L–N).