Asarcogryllacris (Pseudasarca) arborea, 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 : 128-130

Asarcogryllacris (Pseudasarca) arborea sp. nov.

Figs. 43 A–K

Material examined. Holotype (male): East Malaysia: Sabah, Mt. Kinabalu, Poring , elev. 500–700 m (6°5'N, 116°33'E), 19.ii.1996, leg. A. Floren (tree nr. 51)— 1 male (holotype) (Bonn ZFMK).

Other specimens studied: 25.iv.1992, leg. A. Floren (tree nr. 57)— 1 female (paratype) (Bonn ZFMK); same locality, 19.iii.1993, leg. A. Floren (tree nr. 70)— 1 male (paratype) (Bonn ZFMK); same locality, 20.iii.1993, leg. A. Floren (tree nr. 73)— 1 female (paratype) (Bonn ZFMK); same locality, 23.iii.1993, leg. A. Floren (tree nr. 72)— 1 male (paratype) (Bonn ZFMK); same locality, 27.x.1993, leg. A. Floren (tree nr. 73)— 1 female (paratype) (Bonn ZFMK); same locality, 21.ii.1996, leg. A. Floren (tree nr. 9)— 1 female (paratype) (Bonn ZFMK); same locality, 22.ii.1996, leg. A. Floren (tree nr. 50)— 1 male (paratype) (Bonn ZFMK); same locality, 27.ii.1996, leg. A. Floren (tree nr. 52)— 1 female (paratype) (Bonn ZFMK); same locality, 3.iii.1996, leg. A. Floren (tree nr. 1)— 1 male (paratype) (Bonn ZFMK); same locality, 26.iii.1996, leg. A. Floren (tree nr. 13)— 1 male (paratype) (Bonn ZFMK); same locality, 30.iii.1998, leg. A. Floren (tree nr. 11)— 1 male (paratype) (Bonn ZFMK); all specimens from canopy, collected by fogging from Aporusa lagenocarpa , Euphorbiaceae .

Diagnosis. This is so far the only species of the subgenus Pseudasarca . The diagnostic characters are already mentioned in the subgeneric diagnosis.

Description. Small species. Head: Face not particularly large; in frontal view ovoid; forehead nearly smooth; fastigium verticis wider than scapus; ocelli indistinct ( Fig. 43B ). Abdominal tergites two and three each on both sides with two oblique rows of small stridulatory pegs (2–4, 9–13; 8–13, 14–18; n = 6: 2 females, 4 males; Fig. 43K ).

Wings reaching about abdominal apex, little longer or shorter ( Figs. 43A, G ). Tegmen: Due to reduction of wing size venation somewhat reduced; variable between specimens. Radius with two branches, either both (2 specimens) or only one of them R (2 specimens) or RS (3 specimens) forked near tip or RS+MA divide together from R and only later divide into RS and MA (3 specimens); media anterior fused in basal area with R, free from about end of basal third of tegmen; media posterior either absent or fused with cubitus anterior that forks into two veins (MP and CuA, 4 specimens) or remains unforked till tip (4 specimens); cubitus posterior undivided, free throughout; with 3 anal veins, last two with common base.

Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur rather short and thick, with 4–7 external and 3–13 internal spines on ventral margins, little increasing in size towards posterior end (on external side only in apical half); hind tibia with spaced spines on both dorsal margins increasing in size from base to end; ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color pale greyish to yellowish brown (originally conserved in alcohol). Face yellowish brown. Pronotum with a pair of dark lateral bands of various intensity that may be interrupted behind mid-length, sometimes indistinct. Hind femur with little distinct striation. Tegmen yellowish transparent with darker veins; hind wing transparent with yellowish veins. In a dark specimen abdominal tergites with black lateral bands; with small black spots at genicular areas of fore and mid femur and tibia, genicular area of hind leg fully black.

Male. Ninth abdominal tergite globular with apical half curved ventrad and little proximad, furrowed in midline; at end at both sides of furrow with a short, setose protuberance, black and covered with granules. Tenth abdominal tergite band-shaped, interrupted in middle and sub-fused with ninth tergite from which it is separated by a transverse furrow. Paraproctes on internal side prolonged, curved and widening dorsad, at tip black and provided with denticles, forming the counterparts for the protuberances of the ninth tergite ( Figs. 43 C–E). Subgenital plate rhombic with short styli inserted in about mid-length and not exceeding tip of plate; apex slightly bilobate ( Fig. 43F ). Phallus membranous.

Female. Seventh abdominal sternite with apical margin oblique on both sides, in middle with a pair of separated, styliform, little compressed, obtuse projections slightly overlapping base of subgenital plate. Subgenital plate roughly semi-circular, membranous at base ( Fig. 43 I–J). Ovipositor straight, short, about half as long as hind femur; tip obtuse ( Fig. 43H ).

Measurements (7 males, 5 females).—body w/wings: male 13.5–21.0, female 15–18; body w/o wings: male 9.5–21.0, female 14–18; pronotum: male 3.0–3.8, female 3.2–4.0; tegmen: male 9.5–14.0, female 10.5–13.0; hind femur: male 7.0–10.5, female 9–10; tegmen width: male 3.5–4.8, female 4; antenna: male 110–130, female 120– 150; ovipositor: female 4.5–6.0 mm.

Discussion. In most females at hand there is some black secretion like substance sticking to the lateral areas of the apical margin of the seventh abdominal sternite.

Etymology. The new species is named for the fact that all specimens were collected from trees; from Latin arboreus, arborea (from trees).

Figures

FIGURE 43. A–K, Asarcogryllacris (Pseudasarca) arborea sp. nov.: Habitus dorsal view male (A) and female (G), do. lateral view female (H), face (B), male abdominal apex in apical (C–D), oblique lateral (E) and ventral view (F), female seventh abdominal sternite, subgenital plate and base of ovipositor (I–J), stridulatory pegs on second and third abdominal tergites (front is left, K).—(B–C holotype, others paratypes).—L, Asarcogryllacris (A.) macilenta macilenta (Pictet & Saussure, 1891): Habitus dorsal view (lectotype). Abbreviations: 9th ninth abdominal tergite, ce cercus, e epiproct, pa paraproct, ph phallus, pr process of ninth tergite, sg subgenital plate, sp spermatophore (specimen from alcohol).