Mirollia spinulosa, Ingrisch, Sigfrid, 2011

Ingrisch, Sigfrid, 2011, New taxa of Mirolliini from South East Asia and evidence for an abdominal gland in male Phaneropterinae (Orthoptera: Tettigoniidae), Zootaxa 2943, pp. 1-44 : 20

Mirollia spinulosa sp. n.

Figs. 2O, 11E, 12K–L, 13F, 15D–F, 18D–F, 19E–G, 20I –J, 21G

Holotype (male): India: Assam, Gaujhati [Guwahati, 26°11ʹN, 91°44ʹE], 1–30.iv.1920, leg. Fletcher, depository: The Natural History Museum London ( BMNH).

Paratype: India: 1 female, same locality as holotype, 21.iv.–4.v.1918, leg. Fletcher ( BMNH).

Diagnosis. Differs from M. forcipata by the apex of the male cercus being more strongly recurved and narrower, by the male subgenital plate with the prolonged area narrower and the apical excision shorter and mainly by the phallus sclerites. From M. longipinna Ingrisch & Shishodia, 1998 , also occurring in Assam, it differs by the male cerci being more strongly curved, the apex of the male subgenital plate with the apical excision shorter, and the lateral phallus sclerites shorter with rounded apex instead of forming elongate, apically triangular, erected paddles.

Description. Fastigium verticis furrowed; moderately, sinuately descending anteriorly (Fig. 11E). Pronotum with medial carina interrupted by second transverse sulcus; disc with rounded lateral angles, apical area flat; paranota longer than deep; humeral sinus distinct; posterior margin truncate.

Male. Stridulatory area of left tegmen triangularly ovoid (Fig. 12K). Stridulatory file on underside of left tegmen concave and curved; teeth at base extremely dense and indistinct, gradually getting little wider spaced to subapical area; at base with 12.3, in middle with 7.5, near apex with 6.5 teeth per 0.1 mm (Fig. 13F). Mirror on right tegmen in anterior area deeply depressed; 1.89 mm long, 1.58 mm wide; index length: width 1.20 (Fig. 12L). Second and third abdominal tergites setose in midline, holding secretionary stuff (Fig. 19E–G). Ninth abdominal tergite mainly lateral; dorsal area strongly shortened (Fig. 15D). Tenth abdominal tergite triangularly depressed in middle; apical margin concave (Fig. 15D). Epiproct triangular, furrowed (Fig. 15F). Cerci surpassing tip of subgenital plate, swollen in basal third otherwise thin, little re-curved; apex with small, acute ventral tooth (Fig. 15D). Subgenital plate with central area prolonged, with lateral carinae and widening apicad; apex triangularly excised (Fig. 15E). Phallus with two pairs of hyaline sclerites with darkened margins (Figs. 18D–F): inner sclerites roughly mussel-shaped with sharp margin and a short stem, at inner angle with a small knob-like expansion with serrate margin; outer sclerites elongate, clamp-shaped; apex flattened with serrate rounded margin.

Female. Epiproct triangular, with weak dorsal furrow; apex bent backwards [artefact?]. Cerci thin, near apex little curved and pointed. Subgenital plate transverse with auricular baso-lateral sclerites; apical margin broad, nearly truncate, with a short rounded lobe at both lateral angles and a broad, faintly bilobate lobe in middle (Figs. 20I, 21G). Ovipositor falcate (Fig. 20J).

Coloration. Green when alive; specimens studied discoloured, brown, except for green tegmen. Pedicellus and first segment of flagellum with black band at external side; flagellum annulated. Pronotum with a pair of black dots in anterior area of disc. Tegmen green; with indistinct dots along hind margin and a few larger dots (Fig. 2O); stridulatory area of left tegmen with a brown spot in middle (Fig. 12K). Anterior tibia in male with, in female without black strokes in tympanal area.

Etymology. Name refers to the spinose margins of the phallus sclerites.

Measurements (1 male, 1 female). Body w/wings: male 28.5, female 34; body w/o wings: male 14, female 16; pronotum: male 4.7, female 4.7; tegmen: male 21, female 26; hind wing: male 24, female 29; hind femur: male 12, female 13.2; ovipositor: female 6.5 mm.