Mesambria intermedia Storozhenko, 2018

Storozhenko, Sergey Yu., 2018, A new species of the genus Mesambria Stål, 1878 with notes on the tribe Mesambriini (Orthoptera: Acrididae, Catantopinae), Zootaxa 4418 (1), pp. 55-65 : 59-62

Mesambria intermedia Storozhenko , sp. nov.

Figs 7–21

Type material. Holotype—male, Indonesia: Sulawesi Island, province Tengah (= Central Sulawesi province), Lore Lindu National Park, 75 km SE of Palu City, env. of village Wuasa (near eastern park edge), 1000 m, 7–12 February 2011, coll. A.V. Gorochov ( ZISP). Paratypes: the same label as in holotype, 1 male, 1 female ( ZISP); Lore Lindu National Park, 45 km SSE of Palu City, env. of village Tomado on Lindu Lake, 1000 m, 13–17 February 2011, 3 males, 3 females, coll. A.V. Gorochov ( ZISP, FSCB).

Description. Male. Body rugose, medium-siZed for the genus ( Figs 7, 8 ). Head rugose, shorter than pronotum. Face in profile strongly reclinate ( Fig. 7 ). Frontal ridge distinct almost to clypeal margin, deeply sulcate, narrow above and between antennal bases but slightly widened below median ocellus ( Fig. 9 ). VerteX between eyes 3.8–4.5 times broader than width of frontal ridge between antennae. Fastigium of verteX triangular, 0.5–0.6 times as long as horiZontal diameter of the eye, deeply sulcate; lateral margins bordered by low carinulae reaching apical margin of the compound eyes; foveolae narrowly triangular. Eyes large, oval; vertical diameter of eye 2.0–2.1 times as long as subocular furrow. Antennae 20-segmented, almost reaching posterior margin of pronotum; mid segments of antennae 1.8–2.1 times as long as width. Pronotum rugose, long, crossed by three transverse furrows; proZona 2.5–2.6 times as long as metaZona; anterior margin of proZona almost straight; posterior margin of metaZona deeply eXcised; lateral carinae distinct ( Fig. 8 ); median carina low, cut by 3 furrows ( Fig. 7 ). Prosternal spine straight, conical, with blunt apeX. Mesosternal lobes subsquare; mesosternal interspace 0.7–0.8 times as wide as mesosternal lobe; metasternal lobes separated. Tegmina lateral, lamella-like, reaching posterior margin of 1 st tergite , with rounded apeX, 2.9–3.3 times as long as wide. Hind wings absent. Hind femora moderately stout, 3.6–3.9 times as long as their maXimal width; dorso-median carina slightly serrated, terminating in a small tooth; ventral genicular lobes obtuse ( Fig. 7 ). Hind tibiae with 6 outer and 7 inner dorsal spines; outer apical dorsal spine absent. Hind tarsi short, not longer than the half of hind tibiae; third segment (without claws) 0.7 times as long as two others together; arolium large, almost reaching apeX of claws. Tympanum large, oval. 10th tergite with two short furculae on posterior margin. Supra-anal plate narrowly triangular, 1.4–1.5 times as long as its width near base, with pointed apeX; median sulcus shallow, reaching the middle of plate ( Fig. 13 ). Cerci weakly incurved, conical, 2.9–3.0 times as long as their width near base, with blunt apeX ( Fig. 14 ). Subgenital plate short with broadly rounded apeX.

Epiphallus bridge-shaped; bridge broad and completely divided; ancorae relatively short, almost straight; anterior projections triangular; posterior projections broadly rounded; lophi of epiphallus great, eXtending, with enlarged and narrowly rounded outer and very small inner lophi; oval sclerites narrow ( Fig. 19 ). Cingulum sclerotised, consisting of very broad apodemes, Zygoma, and rami; Zygoma truncated apically, covering the arch of cingulum ( Fig. 20 ). Valves of cingulum divided ( Fig. 20 ), apically relatively short with blunt apeX ( Fig. 21 ). Apical valves of penis with pointed apeX, almost as long as cingular valves; basal and apical penis valves connected by a gently curved, unbroken fleXure ( Fig. 21 ).

Body (after alcohol preservation) brown with black marks ( Figs. 7, 8 ). Dorsal side of head light brown with blackish marks; genae light brown with black postocular stripe; face light brown, frontal ridge between antennae black; mandibles black ( Fig. 9 ). Antennae blackish with light brown pedicel, scapus and apical segments of flagellum. Disc of pronotum light brown with blackish spot in the anterior part of proZona and large, trapeZoidal, velvety black spot in metaZona ( Fig. 8 ); anterior margin of the lateral lobes brown with black triangle spot along the lateral carina; upper posterior part of lateral lobes velvety black, lower posterior part light brown ( Fig. 7 ). Tegmina black, with light brown stripe along upper (posterior) margin. Fore and mid legs blackish brown. Hind femur black, with light brown stripe along upper side and two light brown spots in the lower side of femur; dorsal genicular lobes blackish brown, ventral genicular lobes black ( Fig. 7 ). Hind tibia black with yellow ring in basal third; dorsal spines black with yellowish base ( Fig. 8 ). Abdomen dorsally light brown with median black stripe; 10th tergite blackish, furculae black; anal plate and cerci blackish brown. Ventrally 1–8th sternites shiny black with few lateral light brown spots; 9th sternite and subgenital plate shiny black.

Female. Similar to male, but larger and more robust ( Figs. 10, 11 ). Head as in male, but verteX between eyes 3.3–3.7 times broader than width of frontal ridge between antennae, and vertical diameter of eye 1.5–1.7 times as long as subocular furrow. Antennae 18–20-segmented, reaching posterior margin of pronotum; mid segments of antennae 1.9–2.1 times as long as width. Pronotum as in male, but proZona 2.2–2.3 times as long as metaZona (Fig. 00). Prosternal spine straight, conical, with blunt apeX ( Figs. 16, 17 ). Mesosternal lobes as in male; metasternal lobes more widely separated ( Fig. 15 ). Tegmina lamella-like, reaching anterior margin of 2nd tergite, 3.4–3.8 times as long as wide. Hind wings absent. Hind femora 3.9–4.0 times as long as their maXimal width; dorso-median carina slightly serrated, terminating in a small tooth; ventral genicular lobes obtuse. Hind tibiae with 6 outer and 7–8 inner dorsal spines; outer apical dorsal spine absent. Hind tarsi as in male. Tympanum large, oval. Supra-anal plate narrowly triangular, 1.6–1.7 times as long as its width near the base; median sulcus in basal half deep, in apical part shallow. Cerci conical with blunt apeX, almost straight, 2.1–2.2 times as long as their width near base. Subgenital plate 1.4–1.5 times as long as wide, with triangle pointed apeX ( Fig. 18 ). Basivalvular plates long. Ovipositor short; upper margin of dorsal valves weakly eXcised, ventral valves near the base with small tooth ( Fig. 10 ).

Body (after alcohol preservation) brown with black marks ( Figs. 10, 11 ). Dorsal side of head brown; genae light brown with blackish postocular stripe; face and mandibles brown ( Fig. 12 ). Antennae colored as in male. Disc of pronotum brown with trapeZoidal velvety black spot in metaZona ( Fig. 11 ); lateral lobes of pronotum brown with blackish spot near anterior margin and velvety black spot at the upper posterior margin ( Fig. 10 ). Tegmina colored as in male. Fore and mid legs brown, but lower side of femora black. Hind femur blackish, with brown stripe along upper side and two yellowish spots in the lower side of femur; genicular lobes brown ( Fig. 10 ). Hind tibia black with yellow ring in basal third; dorsal spines black with yellowish base. Abdomen dorsally brown but lateral sides of the tergites blackish; anal plate and cerci blackish brown. Sternites colored as in male; subgenital plate shiny black. Ovipositor blackish brown.

Measurements (mm). Length of body: male 17.3–18.5, female 25.5–28.2; antenna: male 8.3–9.0, female 11.2–12.0; pronotum: male 4.3–4.5, female 6.1–6.3; tegmen: male 2.6–3.0, female 4.1–4.5; hind femur: male 11.1–12.0, female 15.3–15.7; hind tibia: male 9.5–10.7, female 14.0–14.2; ovipositor 2.9–3.3.

Comparison. The new species occupies an intermediate position between Mesambria rectangularis and M. trapezina . Hind tibiae are black with a yellow ring in the basal third in both M. rectangularis and the new species (in M. trapezina the hind tibia are completely red), while the velvety black spot in the metaZona is trapeZoidal in both M. trapezina and the new species (in M. rectangularis the spot is broadly transverse, nearly quadrangular). From other Sulawesian congeners the new species differs in the color of pronotum (in M. elegans and M. maculipes the pronotum with relatively narrow blackish stripe along the median carina, compare Fig. 2 vs. Figs. 8, 11 ). Male genitalia of the new species are similar to M. maculipes but differ in the shape of valves of cingulum and apical valves of penis ( Fig. 6 vs. Fig. 21 ).

Distribution. Indonesia: Sulawesi Island (Central Sulawesi province).

Etymology. The name of the new species is derived from Latin adjective ‘intermedius’ (intermediate).

Figures

FIGURES 7–12. Mesambria intermedia sp. nov. 7. male body (holotype), lateral vieW; 8. the same, dorsal vieW; 9. male head, frontal vieW; 10. female body (paratype), lateral vieW; 11. the same, dorsal vieW;12. female head, frontal vieW.

FIGURES 13–21. Mesambria intermedia sp. nov. 13. male apex of abdomen, dorsal vieW; 14. the same, lateral vieW; 15. female sternal plate, ventral vieW; 16. female prosternal spine, posterior vieW; 17. the same, lateral vieW; 18. female apex of abdomen, ventral vieW; 19. epiphallus, dorsal vieW; 20. phallic complex (epiphallus removed), dorsal vieW; 21. the same, lateral vieW.

FIGURES 1–3. Mesambriamaculipes, male.1. body, lateral vieW; 2. the same, dorsal vieW;3. head, frontal vieW.

FIGURES 4–6. Mesambria maculipes, male genitalia. 4. epiphallus, dorsal vieW; 5. phallic complex (epiphallus removed), dorsal vieW; 6. the same, lateral vieW.