Gryllacris (Gryllacris) incornuta, 2018

Ingrisch, Sigfrid, 2018, New taxa and records of Gryllacrididae (Orthoptera, Stenopelmatoidea) from South East Asia and New Guinea with a key to the genera, Zootaxa 4510 (1), pp. 1-278 : 44-45

Gryllacris (Gryllacris) incornuta sp. nov.

Figs. 11B , 12G , 15 C–F

Material examined. Holotype (male): East Malaysia: Sabah, Mt. Kinabalu, Poring (canopy 1), elev. 500–700 m (6°5'N, 116°33'E), 28.vii.1992, leg. K. Riede (Bonn ZFMK).

Diagnosis. The new species differs from G. fuscifrons and related taxa by the absence of a pair of "horns" at the angle between the horizontal and the posterior vertical area of the male ninth abdominal tergite; instead the dorsal vertical area of that tergite is bordered by weak carinae that fuse at ventral end; it follows ventro-proximally a pair of forked carinae separated by a furrow ending into a short flattened area with trilobate apical margin while in G. fuscifrons there is a pair of small knob-like projections at the transition between the posterior vertical and the ventro-proximal areas and the apex is narrow bilobate. Moreover, the apical lobes of the male subgenital plate are longer in the new species than in G. fuscifrons .

Description. Large species ( Fig. 11B ). Head: Face ovoid; forehead nearly smooth; fastigium verticis about little wider than scapus; ocelli indistinct; fastigium frontis separated from fastigium verticis by a faint suture interrupted in middle; subocular furrows only indicated as a weak depression above bases of mandibles; subantennal furrows weak ( Fig. 12G ). Abdominal tergites two and three with obviously present but extremely minute stridulatory pegs.

Wings surpassing hind knees and reaching about middle of stretched hind tibiae. Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius, MA forks behind middle of tegmen into MA and MP; cubitus anterior single branched, undivided; cubitus posterior undivided, free throughout; with 4 anal veins.

Legs: Fore coxa with a large spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of ventral spurs; hind femur with 9–10 external and 9 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color light brown (probably discolored); vertex unicolored; disc of pronotum with indistinct pattern, hind margin with rim dark brown. Legs of general color. Face medium brown with some indistinct lighter spots; a small cone at base of scapus, ventral area of subocular furrow, around dorsal angles of clypeus, ventral areas of labrum and tip of mandibles black. Tegmen yellowish transparent, little darker towards base; veins brown to pale brown; hind wing along anterior margin yellowish transparent, otherwise ochre transparent, main veins brown; cross veins blackish brown bordered by a brown band on both sides.

Male. Eighth abdominal tergite strongly prolonged behind, apical margin broadly truncate in middle. Ninth abdominal tergite (type H in Brunner 1888) with flattened bell-mouthed dorsal surface and nearly rectangularly bent into lateral areas; dorsal surface at tip slightly furrowed; down-curved apical surface furrowed in basal half, with swollen carinae along lateral margin and along medial furrow; after that apical surface bent somewhat proximad and widening apically, with forked carinae, and in ventro-apical view with trilobate apical margin; in lateral view the down-curved apical part appears as a semicircle with the ventro-lateral angle projecting as a short stout tooth with subacute tip ( Figs. 15 C–F). Tenth abdominal tergite band-shaped with sinuate dorsal margin; interrupted in middle. Epiproct small, hidden. Subgenital plate somewhat less than twice as wide as long; lateral margins convexly approaching; apex wide with a large, bilobate and slightly grooved process in middle; styli long and little upcurved, inserted at lateral angles. Phallus membranous.

Female unknown.

Measurements (1 male).—body w/wings: 50; body w/o wings: 37; pronotum: 7.5; tegmen: 36; tegmen width: 13; hind femur: 20 mm.

Etymology. The new species is named for the absence of horns at the angle between the horizontal and the posterior vertical area of the male ninth abdominal tergite; from Latin prefix in (not) and cornutus (horned).

Figures

FIGURE 11. Genus Gryllacris: Habitus dorsal view (A–D, G–I) and lateral view (E): A, G. kinabaluensis Griffini, 1915 female; B, G. incornuta sp. nov. male holotype; C–D, G. (Pardogryllacris) longiloba Gorochov & Dawwrueng, 2015 male (C) and female (D); E–F, G. (P.) lineolata menzeli (Karny, 1924) male (E) and female (F); G, G. (P.) l. lineolata Serville, 1838 male; H, G. (Gigantogryllacris) ligulata sp. nov. male holotype; I, G. (Gi.) bilineata sp. nov. male holotype. Scales 10 mm (E and F not to scale).

FIGURE 12. Genus Gryllacris: Face: A, G. (Pardogryllacris) ovulicauda sp. nov. male holotype; B–C, G. obscura cambodiae Gorochov, 2007 male (B) and female (C); D, G. f. fuscifrons Gerstaecker, 1860 female holotype; E, G. s. signifera (Stoll, 1813) male; F, G. sok sp. nov. female holotype; G, G. incornuta sp. nov. male holotype; H, G. bancana Karny, 1930; I, G. o. obscura Brunner, 1888; J, G. v. vittata Walker, 1869 female holotype; K, G. kinabaluensis Griffini, 1915 female; L, G. (P.) longiloba Gorochov & Dawwrueng, 2015 female; M, G. (P.) lineolata menzeli (Karny, 1924) male; N, G. (P.) l. lineolata Serville, 1838 male; O, G. (Gigantogryllacris) bilineata sp. nov. male holotype; P, G.(Gi.) ligulata sp. nov. male holotype.

FIGURE 15. Genus Gryllacris fuscifrons group (A–F) and subgenus Gigantogryllacris (G–L): A–B, G. f. fuscifrons Gerstaecker, 1860 from Brunner collection in NMW (A) and from ZMB (B); C–F, G. incornuta sp. nov. holotype; G–I, G. (Gi.) ligulata sp. nov. holotype; J–L, G. (Gi.) bilineata sp. nov. holotype.—Male abdominal apex in about apical (A, C, G, K), dorsoapical (B), oblique lateral (E–F), and ventral view (J); lateral with uplifted 9th tergite, the arrow marks the insertion point of the in situ hidden projections of 9th tergite (H); apical with strongly uplifted 9th tergite and out pressed projections (I); ventral with uplifted ninth tergite (L). The arrows mark the hidden position of the apical teeth or projections of the ninth abdominal tergite.