Stictophaula bruneii, Tan, Ming Kai & Wahab, Rodzay Bin Haji Abdul, 2017

Tan, Ming Kai & Wahab, Rodzay Bin Haji Abdul, 2017, Taxonomic review of Stictophaula (Orthoptera: Phaneropterinae) with the description of one new species from Brunei Darussalam, Zootaxa 4247 (3), pp. 301-312 : 307-310

Stictophaula bruneii , new species

( Figs. 7 , 8 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:496279

Material examined. Holotype (male): Brunei Darussalam, Ulu Temburong National Park, Kuala Belalong Field Studies Centre , primary forest, N4.54727, E115.15804, 115.0 ± 9.0 m, attracted to light after rain, 25 September 2016, 2300 hours, coll. M. K. Tan (KB.16.56) ( IBER).

Diagnosis. This species differs from all known congeners by the shape of the male genitalia sclerite and by the median lobes of the subgenital plate being nearly as long as the lateral lobes, surpassing the middle of the lateral lobe.

Comparison with other species. Refer to key for comparison. The species is similar to S. mikhaili Gorochov, 2004 from Java, S. spinosolaminata (Brunner von Wattenwyl, 1878) from Java and S. quadridens Hebard, 1922 from Malay Peninsula with regard to the male subgenital plate having the median lobe distinctly elongated but differs by the median lobe not surpassing the middle of the lateral lobe and by the shape of the male genitalia sclerite. It is also similar to the Bornean species [ S. aspersa Gorochov & Voltshenkova, 2009 , S. coco Gorochov & Voltshenkova, 2009 , S. multa Gorochov & Voltshenkova, 2009 , S. mistshenkoi Gorochov & Voltshenkova, 2009 and S. rara Gorochov & Voltshenkova, 2009 ] with regard to the stout shape of the male genitalia sclerite but differs by the shape of the male subgenital plate.

Description. Habitus typical for the genus ( Fig. 7 ). Head stout, its length about 0.4 times pronotum length. Fastigium conical, apical half tapering, distinctly narrower than antennal scapus, ridged in middle, apex obtuse not surpassing antennal scapus. Eye globular, prominently protruding. Frons smooth. Pronotum smooth, about 1.8 times longer than wide. Dorsal plate of pronotum with anterior margin slightly concave, with posterior margin broadly rounded, not emarginated in middle ( Fig. 8 A); with two U-shaped sulci, one before, the other about in middle; lateral margin gently widening posteriorly, lateral keels distinct, with pronotal dorsal plate [= disc (of pronotum)] angularly curved into lateral lobes; lateral lobe slightly taller than long, anterior margin distinctly concave, ventral margins angularly undulated, posterior margin very broadly rounded; angle between lateral keel and lateral lobe less than 90 ° ( Fig. 8 B). Thoracic auditory spiracle [= thoracic foramen] elongated, covered by pronotal lateral lobe. Prosternum unarmed. Mesosternum with triangular lobes, with apex of lobes obtuse; metasternal lobes elongated. Tegmen and hind wing fully developed. Tegmen with raised reticulation within cells, appearing glossy; narrow basally, widened gently medially and with apex narrowly rounded. Hind wing surpassing tegmen. Anterior coxa with a fairly elongated spine, with acute apex pointing ventrally. Anterior femur with four inner ventral subapical spines. Anterior tibia with internal tympanum conchate, external tympanum open and oval; with 2 outer and 3 inner subapical ventral spines and 1 inner apical dorsal spine present. Middle femur with 5-6 outer subapical spines. Middle tibia with 8-10 outer and 3-4 inner ventral subapical spines and 1 inner apical dorsal spine present. Hind femur with 3-6 outer and 3-4 inner minute ventral subapical spines; hind knee with bispinose lobe, ventral spine minute.

Male. Tegminal venation: costal vein distinct, Rs originate slightly before middle, Rs bifurcate before middle into two forks (stem of Rs slightly shorter than shorter fork of Rs). Stridulatory file of left tegmen distinctly thickened and differently coloured when viewed dorsally; slim and elongated, roundly bent in middle, about 1.9 mm long; with about 107 very densely arranged and evenly spaced teeth ( Fig. 8 C).

Abdominal apex as shown in Figs. 8 D, 8E. Tenth abdominal tergite simple, transverse, with posterior margin straight and truncated ( Fig. 8 D). Epiproct small, triangular, broader at base than length, slightly depressed in middle, apex rounded ( Fig. 8 D). Cercus fairly elongated, generally curved gently inwards, tapering to narrow apex with small tooth; apical third feebly sinuate ( Figs. 8 D, 8E). Subgenital plate stout, very broad at base, about as wide as long; narrowing slightly towards apex. Apex of subgenital plate with four projecting lobes: two lateral lobes fairly long and broad and feebly curved outwards, with subacute apex; two straight medial lobes slightly shorter (surpassing middle of lateral lobe) and slightly narrower (base 0.7 times narrower than lateral lobes at base) with acute apex; medial lobes separated from each other by a broad and round emargination ( Fig. 8 E). Genitalia sclerite stout and triangular; forked basally with a wide emargination between both arms; ventral surface with rows of minute teeth, teeth gradually becoming larger apically; apex curved dorsad and subacute ( Figs. 8 F, 8G).

Female. Unknown.

Colouration (live). White and grey-green in general ( Fig. 7 ). Head with dorsum grey-green, scapus and antennal segments grey-green to pale green; frons (including mouth parts and palps) white, gena white anteriorly and pale green posteriorly. Pronotum generally green with fairly numerous very small, irregularly shaped purple spots; dorsal plate generally darker than lateral lobe. Tegmen with venation grey-green; left stridulatory file thickened and darkened; anal margin yellow brown. Hind wing mostly hyaline, with venation of projecting area grey-green. Thoracic and abdominal tergum pale green with numerous fine purple spots; thoracic and abdominal sternum white. Legs generally pale green with numerous fine purple spots; fine spots more prominent and in higher density on anterior and middle femora, a few large purple spots on posterior femur.

Measurements (in mm). BL = 20.4; BWL = 41.0; PL = 5.6; PW = 3.1; TL = 33.1; HWT = 5.3; HFL = 17.8; HTL = 18.6.

Etymology. The new species is named after the type locality, Brunei Darussalam. This species also represents the first species of Stictophaula described from the country.

Figures

FIGURE 7. Stictophaula bruneii sp. nov. male holotype: habitus (with live colouration).

FIGURE 8. Stictophaula bruneii sp. nov. male holotype: head, pronotum and dorsum of tegmen in dorsal view (A); head and pronotum in profile view (B); stridulatory file of left tegmen in ventral view (C); abdominal apex in dorso-posterior (D) and ventral (E) views; genitalia sclerite in ventral (F) and ventro-profile (G) views. Scale bars: 2 mm (A, B); 1 mm (C – E).