Trusmaditetrix complanata Storozhenko, 2023

STOROZHENKO, SERGEY YU., 2023, New curious genus of the subfamily Cladonotinae (Orthoptera: Tetrigidae) from Borneo Island with remarks on the classification of this subfamily, Zootaxa 5315 (1), pp. 59-70 : 65-68

Trusmaditetrix complanata Storozhenko , sp. nov.

Figs 1–8

Material examined. Holotype — ♀, Malaysia: Sabah (North Borneo), Trus Madi Mt , 1000 m, partly primary / partly secondary forest, 13–25.V.2007, leg. A. V. Gorochov ( ZIN) . Paratypes: 1 ♁, 1 nymph of last instar, same data as for holotype ( ZIN) .

Description. Female. Body strongly compressed dorso-vernally. Antennae filiform, 15-segmented; antennal grooves situated distinctly below the level of lower margin of eyes. Length of antenna 1.4 times longer than length of fore femur; mid segments of antennae 4.5–5 times as long as wide. Lateral ocelli placed slightly above the level of lower margin of eyes. Fastigium of vertex with deep concavities between lateral carinae, almost reaching the front of eyes from dorsal aspect, 1.25 times wider than width of one eye from above; anterior margin of fastigium triangle; median carina long; lateral carinae slightly elevated. Width of 1st antennal segment 1.25 times more than width of frontal ridge near base of antennae. Median carina of pronotum weakly excised before shoulders in profile. Prozonal carinae parallel. Hind margin of lateral lobe of pronotum bisinuate, tegminal (upper) sinus distinct; lower sinus deep; lower part of lateral lobe directed outwards, with obliquely truncate apex; infrascapular area narrow, lower margin of area straight. Tegmina elongated, narrow, width of visible part of tegmen considerably less than width of mid femur; hind wings almost reaching the apex of posterior process of pronotum. Lower carina of fore femur finely dentate with a strong lappet. Fore tibia narrowing apically. Lower carinae of mid femur finely dentate with 3 lappets. Mid tibia widened near the middle and narrowed apically. Fore femur 2.6 times, mid femur 2.7 times as long as wide. Hind femur slender, 3.2 times as long as wide; upper and lower carinae finely dentate; lower outer keel of hind femora with two projections. Upper side of hind tibia with 4 outer and 3 inner teeth. First tarsal segment of hind legs as long as 3rd segment (without claws). Subgenital plate trapezoidal, with triangle posterior margin. Cerci conical, 1.5 times as long as wide near base, with tapered apex. Valves of ovipositor dentate. Upper valve of ovipositor 3.3 times longer than its maximum width. Lower valve of ovipositor 4.5 times longer than its maximum width.

Body brown. Head dark brown. Antennae brown. Dorsal side of the pronotum with small black marks; lateral lobes brown. Fore and mid femora brown with indistinct black spots. Fore and mid tibiae brown with black apex. First segment of fore and mid tarsi blackish, 2nd light brown with black apex; claws brown. Hind femora including lower outer area brown with blackish marks. Hind tibiae blackish. First segment of hind tarsi light brown with black apex, 2nd segment black, 3rd segment with light with black apex; claws brown. Abdominal tergites black with light brown spots forming two longitudinal stripes on the lateral sides of tergites. Sternal plate and abdominal sternites blackish brown; subgenital plate black. Ovipositor blackish brown.

Male. Similar to female but smaller. Antennae 14-segmented. Fastigium of vertex 1.4 times wider than width of one eye from above. Width of frontal ridge near the base of antennae equal to width of 1st antennal segment. Pronotum, tegmina, and hind wings as in female. Fore femur 2.7 times, mid femur 2.6 times, hind femur 3.45 times as long as wide. Epiproct narrow triangular, with pointed apex. Subgenital plate in lateral view elongated; in ventral view apex of plate excised. Cerci 1.4 times as long as wide, with pointed apex. Body colored as in female but abdominal tergites with small light spots, 8th abdominal sternite apically with light brown stripe, 9th sternite blackish brown, and subgenital plate brown.

Measurements (in mm). Length of body (from frontal ridge to apex of subgenital plate) male 6.9, female 7.2; pronotum male 7.1, female 8.1; antenna male 2.8, female 3.0; fore femur male 1.9, female 2.1; mid femur male 2.1, female 2.4; hind femur male 4.5, female 5.1; ovipositor 1.0.

Distribution. Malaysia: Borneo Island.

Etymology. From Latin ‘ complanata’ means flattened.

Figures

FIGURES 1–5. Trusmaditetrix complanata sp. n. 1. Female body, dorsal view; 2. Same, ventral view; 3. Same, lateral view. 4. Female head, frontal view; 5. Male head, frontal view. Scale bars 1 mm.

FIGURES 6–8. Trusmaditetrix complanata sp. n. 6. Male body, dorsal view; 7. Same, ventral view; 8. Same, lateral view. Scale bars 1 mm.