Gorochovitettix khaosung Tan & Artchawakom, new species

(Figs. 1 and 2)

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:470576

Material examined. Holotype (male): Thailand, Nakhon Ratchasima, Sakaerat Biosphere Reserve, “Khao Sung” Silvicultural Station, primary dry evergreen forest, on tree trunk, N14.49460, E101.87271, 662.8± 5.9 m, 26 June 2014, coll. M. K. Tan, H. Yeo & S. T. Toh (SERS.14.73) (ZRC).

Paratypes: 1 male, 1 female. Same locality and environments as holotype: male (SERS.14.72), N14.49460, E101.87271, 662.8± 5.9 m, 26 June 2014, coll. M. K. Tan, H. Yeo & S. T. Toh; female (SERS.14.66), N14.49489, E101.87122, 624.7± 8.1 m, 26 June 2014, coll. M. K. Tan, H. Yeo & S. T. Toh (all in ZRC).

Diagnosis. This species differs from Gorochovitettix kannackiensis Storozhenko & Pushkar, 2015 by the set of unique charactrs: median carina of fastigium strongly produced in front of anterior margin of fastigium; male and female subgenital plate rather slender and elongated; female subgenital plate with posterior margin of plate truncated with a distinct median lobe. Male morphometric also differs by: MAL/MAW = 8.9 (instead of 5.5–6.1); SW/1stAW = 2.0 (instead of 2.1–2.4); TL/TW = 2.9 (instead of 3.1–3.6); MFL/MFW = 2.6 (instead of 2.7); SGPL/SGPW = 1.6 (instead of 1.2–1.3). Female morphometric also differs by: MAL/MAW = 7.0 (instead of 5–6); VW/EW = 2.0 (instead of 1.4); SW/ 1stAW = 2.4 (instead of 2.5); MFW/TW = 2.1 (instead of 2.3–2.7); FFL/FFW = 2.9 (instead of 2.1–2.3); HFL/HFW = 2.9 (instead of 3.1–3.2); OVDL/OVDW = 5.2 (instead of 3.6–3.7); OVVL/OVVW = 5.4 (instead of 6.5–7.8).

Description. Male. Body medium sized for Tetrigidae in general (Figs. 1 A, 1C). Antennae filiform, 15-segmented; antennal bases below the level of lower margin of eyes; mid antennal segments 8.9 times (n = 2) as long as wide. Eyes not protruding above vertex in lateral view. Lateral ocelli placed near the level of lower margins of eyes (Fig. 2 A). Fastigium of vertex with deep concavities behind lateral carinae, not produced in front of eyes from dorsal aspect, 1.5 times (n = 2) wider than width of one eye from above (Fig. 2 B); anterior margin of fastigium truncated, median carina of fastigium strongly produced in front of anterior margin of fastigium (Fig. 2 B); lateral carinae elevated; subocular lobes distinct. Frontal ridge (or scutellum) in anterior view forms a shallow concavity; in lateral view distinctively produced to form two broadly rounded lobes with shallow excision between the lobes; the two lobes are of about equal height (Fig. 2 C). Width of frontal ridge between eyes 2.0 times (n = 2) more than width of scapus. Pronotum finely nodulose near the anterior half and more punctuated towards the apical half, well surpassing apex of abdomen (Figs. 1 A, 1B); in dorsal view anterior margin of pronotum slightly concave; posterior process of pronotum reaching one thirds to half of hind tibiae, in dorsal view process with truncated apex (Fig. 2 D). Median carina of pronotum substraight in profile (Fig. 2 D). Lateral carinae of pronotum in prozona well defined, parallel to feebly converging posteriorly. Hind margin of lateral lobes of pronotum bisinuate, tegminal (dorsal) sinus less deep than lower sinus; lower part of lateral lobe directed laterally; posterior angles of lateral lobes in dorsal view obliquely truncated (Fig. 2 C). Tegmina rudimentary, elongated oval with apical margin rounded; 2.9 times (n = 2) longer than wide; visible part of tegmen 2.3 times (n = 2) less wide than mid femur (Fig. 2 C). Hind wings long, barely surpassing apex of pronotum. Fore and mid femora considerably compressed laterally to form leaf-like carinae; upper carinae broadly rounded and gently serrated, lower carinae feebly sinuate and serrated (Figs. 2 E, 2F). Fore femur 2.2 times (n = 2), mid femur 2.6 times (n = 2) as long as wide. Hind femur slender, 3.1 times (n = 2) as long as wide; upper and lower carinae on the external surface also finely serrated; lower carinae on the inner surface with a spine-like peg near the coxa. Upper side of hind tibia with 5 outer and 5 inner spines (n = 2); with minute denticles between spines. Length of first tarsal segment of hind legs 0.9 times (n = 2) the length of third segment (without claws) (Fig. 2 G).

Subgenital plate in ventral view rather slender and elongated, about 1.6 times (n = 2) longer than wide, with apex of plate excised (Fig. 2 H); in lateral view broad and elongated (Fig. 2 I). Cerci stout basally with pointed apex (Fig. 2 I).

Colouration. Body yellow brown, with few blackish and light brown patterns on pronotum and legs. Head brown with a tint of green (Fig. 2 A). Antennae light brown basally, darken to brown or dark brown apically. Dorsal plate of pronotum yellow brown with black and light brown patterns. Lateral lobes of pronotum, darker brown dorso-anteriorly and light brown ventrally (Fig. 2 C). Fore and mid legs pale yellow brown, with very faint darken oblique rings. First segment of fore and mid tarsi brown, third segment with whitish base and black apex; claws brown. Hind femora pale yellow brown with some black patterns; ventrally black (Fig. 1 A). Hind tibiae dark brown, with blackish rings near base and the middle. First and second segment of hind tarsus brown, third segment with light brown base and blackish apex; claws brown. Abdomen from above blackish with two light brown longitudinal stripes.

Female. Similar to male, but larger. Mid antennal segments 7.0 times (n = 1) as long as wide. Fastigium of vertex 2.0 times (n = 1) wider than width of one eye from above. Width of frontal ridge between eyes 2.4 times (n = 1) more than width of first antennal segment. Tegmen 3.2 times (n = 1) longer than wide. Visible part of tegmen 2.1 times (n = 1) less wide than mid femur. Fore femur 2.9 times (n = 1), mid femur 2.9 times (n = 1) as long as wide. Hind femur slender, 2.9 times (n = 1) as long as wide. Upper side of hind tibia with 5 outer and 5 inner spines (n = 1). Length of first tarsal segment of hind legs 0.9 times (n = 1) as long as that of third segment (without claws).

Subgenital plate 1.7 times (n = 1) longer than broad; posterior margin of plate truncated with a distinct median lobe (Fig. 2 J). Cerci same as male. Valves of ovipositor narrow, dentate. Upper valve of ovipositor 5.2 times (n = 1) longer than its maximum width. Lower valve of ovipositor 5.4 times (n = 1) longer than its maximum width; apical tooth curved downward (Fig. 2 K).

Colouration. Body, head and legs generally similar coloured, but darker than males (Figs. 1 B, 1D). Ovipositor dark brown, with apices of denticles red brown (Fig. 2 K).

Measurements. See Table 1.

Etymology. This species is named after the type locality “Khao Sung” Silvicultural Station; noun in apposition. Life history. This species was found to inhabit tree trunks in primary dry evergreen forest.