Furcilarnaca trilobata, 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 : 187-188

Furcilarnaca trilobata sp. nov.

Figs. 63 E–H, 64F–G, 65A–D

Material examined. Holotype (male): Thailand: Nan, Doi Phukha , elev. 1300–1400 m (19°13'N, 101°5'E), 4.x.1991, leg. S. Ingrisch—(Bonn ZFMK).

Other specimens studied: Thailand: same data as holotype: 1 female (paratype) (Bonn ZFMK).

Diagnosis. The new species is similar to F. salit sp. nov. but differs by smaller size, little shortened wings in female and by male and female abdominal appendages. The pair of spines at the ninth abdominal tergite are shorter than those of the tenth tergite not opposite and the male subgenital plate is divided only in apical half not for almost full length, the apical projections of the subgenital plate are shorter than those in F. salit and between both lobes there is a shorter unpaired lobe without spine at tip, which differs from the situation in the other species of the genus ( Figs. 64 F–G). In the female F. trilobata sp. nov. differs by the groove of the seventh sternite that is closed behind by a distinct separate sclerite ( Figs. 65 B–D) while in F. salit it is closed by stiffened upcurved structure of the intersegmental membrane.

Description. Small species. Head: Face ovoid; fastigium verticis wider than scapus, separated by a fine suture from fastigium frontis; ocelli distinct ( Fig. 63F ). Abdominal tergites two and three each with two rows of stridulatory pegs (16, 15–19; 15–19; n = 1 male, 1 female; Fig. 63H ).

Wings in female not reaching tip of abdomen and not surpassing hind knees, in male covering abdomen and little surpassing tip of hind femur ( Fig. 63E, G ). Tegmen: Radius releases RS in about apical third. Media anterior fused in about basal third with radius. Cubitus anterior at base with a single branch that forks into two veins, the anterior branch makes a curvature and receives an oblique connection vein from MA (male) or it fuses with MA and almost immediately separates again (female); in male the anterior branch divides again into two parallel branches, MP and CuA1, while in the more strongly reduced tegmen of the female the anterior branch remains undivided as MP+CuA1; the posterior branch (CuA2) does not divide further in both sexes; cubitus posterior undivided, free throughout; with 3 anal veins.

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 with 5–7 external and 4–6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides.

Coloration. General color pale brown. Face uniformly yellowish brown. Tegmen transparent with yellowish or brown veins, in apical half densely covered with fine short hairs except in posterior internal quarter; hind wing transparent with yellowish or brown veins.

Male. Ninth abdominal tergite globular, in apical area furrowed; at apex split into a pair of short triangular projections with acute tip; apical margin laterally of those projections forming a very short convex lobe. Tenth abdominal tergite narrow band-shaped, just below projections of ninth tergite with a pair of acute spines. Subgenital plate basal area moderately long, little sclerotised; styli inserted at lateral angles of basal area, curved at base and tip slightly club-shaped; between bases of styli subgenital plate prolonged into a pair of wide, compressed, and in apical area little curved projections with acute tip, separated from each other by a narrow projecting end lobe with obtuse tip ( Figs. 64 F–G).

Female. Seventh abdominal sternite with bulgy basal area, followed by a large and wide oval groove and finally by a little narrower and slightly elevated separate sclerite closing the groove from behind, this sclerite with triangular lateral areas bent dorsad, apical margin slightly concave in middle. Subgenital plate baso-central area largely membranous, lateral margins convex, apical margin bilobate ( Figs. 65 B–D). Ovipositor short, substraight; before tip margins strongly narrowing, tip subacute ( Fig. 65A ).

Measurements (1 male, 1 female).—body w/wings: male 13, female 15; body w/o wings: male 10, female 15; pronotum: male 2.2, female 2.5; tegmen: male 10.5, female 8.5; tegmen width: male 3.0, female 2.5; hind femur: male 6.5, female 6.0; antenna: male 50; ovipositor: female 6.5 mm.

Etymology. The name of the new species refers to the three-lobate male subgenital plate; from Latin prefix trithree and lobus lobe.

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 64. Genus Furcilarnaca: A–D, F. salit sp. nov. male holotype; E, F. pulex (Karny, 1928) male holotype; F–G, F. trilobata sp. nov. male holotype.—Male abdominal apex in lateral (A), about apical (B, D, F) and ventral view (C, E, G).

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).