Furcilarnaca chiangdao, 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 : 182

Furcilarnaca chiangdao sp. nov.

Figs. 63 I–K, 65E–G

Material examined. Holotype (female): Thailand: Chiang Mai, Doi Chiang Dao trekking, (19°20'N, 98°45'E), 4– 7.vi.1986, leg. S. Ingrisch—(Bonn ZFMK).

Diagnosis. The new species is unique for the shape of the female seventh abdominal sternite possessing an anteriorly open lobe that overlaps the anterior surface of the sternite ( Figs. 65 F–G). With regard to the shortened wings and the shape of the female subgenital plate F. chiangdao is similar to F. brachyptera Li et al. (2015) from Yunnan, but differs apart from the seventh sternite by the sclerotised baso-lateral angles of the subgenital plate. The shape of the female subgenital plate is also similar to those of F. huangi Gorochov, 2004 from Yunnan and another unnamed species figured in the same paper. The new species differs apart from the brachypterous wing condition by the absence of a pair sclerites embedded in the seventh sternite, instead this sternite has an anterior fold of the surface.

Description. Small species ( Fig. 63I ). Head: Face not particularly large; in frontal view roughly oval; forehead nearly smooth; fastigium verticis little wider than scapus; medium and lateral ocelli small long-oval, whitish yellow ( Fig. 63J ). Abdominal tergites two and three each with two rows of stridulatory pegs (11–13, 17–20; 20, 25–25; Fig. 63K ).

Wings covering about half of abdomen ( Fig. 63I ). Tegmen: Radius divides into R and RS shortly before tip, afterwards both veins unbranched; media anterior only at very basal area fused or sub-fused with R, then free and undivided but meets in a point with CuA1; cubitus anterior at base with a single branch that forks into two veins at about end of basal third, shortly after the anterior branch meets in a point with MA but afterwards remains undivided as MP+CuA1; the posterior branch CuA2 also undivided; cubitus posterior undivided, free throughout; with 3 anal veins plus an incomplete fourth vein arising from third.

Legs: Fore coxa with small 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 with 6–7 external and 6–8 internal spines on ventral margins, little increasing in size towards posterior end; hind tibia with rather few spines on both dorsal margins; ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color dirty yellowish brown; eyes black. Face yellowish brown. Tegmen transparent, only towards tip little smoky with black veins; hind wing transparent.

Male unknown.

Female. Seventh abdominal sternite fully membranous without distinct border to intersegmental membrane, surface with rough transverse striation; from end of basal third anteriorly the posterior area of the surface forming a free roundish lobe that overlaps the surface of the anterior area that has a fine transverse striation, at the tip of that lobe there is a small knob-like projection on ventral surface ( Figs. 65 F–G). Subgenital plate fully membranous except for baso-lateral angles; apical area forming two obtuse angular lobes, triangularly excised in between. Ovipositor straight, very faintly curved ventrad; hardly longer than hind femur; tip narrowly obtuse ( Fig. 65E ).

Measurements (1 female).—body w/wings: 18; body w/o wings: 18; pronotum: 3; tegmen: 8.5; hind femur: 9; ovipositor: female 9.5 mm.

Etymology. Named after the type locality, noun in apposition.

Figures

FIGURE 63. Genus Furcilarnaca: A–D, F. salit sp. nov. male holotype (A, C–D) and female paratype (B); E–H, F. trilobata sp. nov. male holotype (E–F) and female paratype (G–H); I–K, F. chiangdao sp. nov. female holotype; L, F. pulex (Karny, 1928) male holotype.—Habitus dorsal view (A–B, E, G, I, L), face (C, F, J), stridulatory pegs on second and third abdominal tergites (front is right) (D, H, K). Scales = 10 mm.

FIGURE 65. Genus Furcilarnaca: A–D, F. trilobata sp. nov. female paratype; E–G, F. chiangdao sp. nov. female holotype; H–J, F. salit sp. nov. female paratype.—Female habitus in lateral view (A, E), ovipositor (H), apical area of female abdomen with seventh abdominal sternite, subgenital plate and base of ovipositor in ventral (B, F, I), oblique ventral view (D, J), and oblique lateral view (C, G).