Hyboella sumatrensis Storozhenko, 2022

Storozhenko, Sergey Yu., 2022, The genus Hyboella Hancock, 1915 (Orthoptera: Tetrigidae: Metrodorinae) in Indonesia, Zootaxa 5195 (2), pp. 179-186 : 182-184

Hyboella sumatrensis Storozhenko , sp. nov.

Figs. 9–16

Material examined. Holotype – female, Indonesia: Sumatra Island, Province Lampung, Nat. Park Bukit Barisan Selatan, 20–30 km WWN of town Kotaagung , env. of vill. Sukaraja , 05°30' S, 104°26' E, h = 600 m, 3–4.V.2009, leg. A. Gorochov, M. Berezin, E. Tkatshova ( ZIN) . Paratypes: 1 female, 1 male, 3 nymphs of last instar, same data as in holotype (ZIN, FSCB) .

Description. Female. Body robust, medium sized for genus.Antennae filiform, 15-segmented; antennal grooves situated at the level of lower margin of eyes. Length of antenna 1.5–1.7 times longer than length of fore femur; mid segments of antennae 4.5–5.5 times as long as wide. Eyes not protruding above vertex in lateral view. Lateral ocelli placed slightly below the middle of eyes. Fastigium of vertex with deep concavities between lateral carinae, reaching the front of eyes from dorsal aspect, 1.8–1.9 times wider than width of one eye from above; anterior margin of fastigium almost straight, median carina of fastigium long; lateral carinae low. Frontal ridge in lateral view rounded. Width of frontal ridge near base of antennae equal to width of 1st antennal segment. Pronotum rugulose, almost reaching apex of hind femora; in dorsal view anterior margin of pronotum almost straight in the middle and posterior process of pronotum broad with narrow rounded apex. Median carina of the pronotum in profile raised before shoulders and strongly decries behind shoulders. Prozonal carinae well defined, constricted backwards. Hind margin of lateral lobes of the pronotum with both tegminal and lower sinus; posterior angles of lateral lobes in dorsal view pointed. Visible part of tegmen narrow, with rounded apex. Hind wings abbreviated, reaching posterior margin of 4-th abdominal tergite. Fore and mid femora with weakly sinuate upper and lower carinae. Fore femur 3.5–3.6 times, mid femur 3.7–3.8 times as long as wide. Hind femur stout, 3.0 times as long as wide; upper carina weakly sinuate, lower carina almost smooth. Upper side of hind tibia with 7–8 outer and 4–5 inner teeth. First tarsal segment of hind legs 2.0 times longer than 3rd segment (without claws). Subgenital plate short, transversal; posterior margin of plate broadly rounded and with angular posterior process near middle. Cerci short, conical. Valves of ovipositor narrow, dentate. Upper valve of ovipositor 4.2 times longer than its maximum width. Lower valve of ovipositor 5.3 times longer than its maximum width.

Body brown with black marks. Head dark brown. Antennae yellowish with brown apex. Apical segment of maxillary palps white, other segments black. Dorsal side of pronotum blackish brown; posterior angles of lateral lobes of the pronotum light brown. Fore and mid femora blackish with small light brown spots. Fore and mid tibiae brown, with two blackish rings. First segment of fore and mid tarsi brown; second segment black with light brown ring; claws brown. Hind femora dark brown with light brown marks. Hind tibiae blackish with two light rings; hind tarsi brownish black. Abdomen black with light brow marks. Ovipositor brown.

Male. Similar to female. Antennae 14-segmented; length of antenna 1.6 times longer than length of fore femur; mid segments of antennae 5.8–6.7 times as long as wide. Fastigium of vertex 1.7 times wider than width of one eye from above. Width of frontal ridge near the base of antennae almost equal to width of 1st antennal segment. Posterior angles of lateral lobes of the pronotum in dorsal view almost forming a spine with blunt apex. Median and prosonal carinae of the pronotum, tegmina and hind wings as in female. Fore and mid femora 3.7–3.9 times as long as wide; upper and lower carinae weakly sinuated. Hind femur 2.8 times as long as wide; upper and lower carinae as in female. Upper side of hind tibia with 9 outer and 5–6 inner teeth. First tarsal segment of hind legs 1.7 times longer than 3rd segment (without claws). Epiproct narrow triangular, with pointed apex. Subgenital plate in lateral view elongated with shallow excision at apex; in ventral view apex of plate excised. Cerci as in female.

Body coloured as in female but fore and mid tibiae black with three light rings, and posterior angles of lateral lobes of the pronotum blackish brown with shiny brown apex. Epiproct, subgenital plate and cerci dark brown.

Measurements (in mm). Length of body (from frontal ridge to apex of subgenital plate) male 11.0, female 10.5–11.0; pronotum male 10.0, female 10.7–12.1; antenna male 3.9, female 4.0–4.2; fore femur male 2.4, female 2.5; mid femur male 2.6, female 2.7–2.8; hind femur male 7.3, female 7.9–8.4; ovipositor 1.6–1.8.

Distribution. Indonesia (Sumatra Island).

Differential diagnosis. This new species is easy recognizable from congeners in pointed at apex posterior angles of the lateral lobes of the pronotum (other species of the genus has oblique truncate or broadly rounded posterior angles) and is most similar in this aspect to Hyboella tentata from India and Nepal ( Hancock, 1915; Shishodia, 1991; Tumbrinck, 2015), but differs from latter in rounded anterior margin of the pronotum in dorsal view (in H. tentata , anterior margin of the pronotum distinctly triangular shape).

Etymology. The name of new species is originated from the type locality.

Figures

FIGURES 9–16. Hyboella sumatrensis sp. nov. holotype female (9–12) and paratype male (13–16). 9, 13 habitus, lateral; 10, 14 habitus, dorsal; 11, 15 head, anterior; 12, 16 apex of abdomen, ventral. Scale bars = 1 mm.