Eugryllacris crassicauda, 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 : 35

publication ID 10.11646/zootaxa.4510.1.1

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Eugryllacris crassicauda

sp. nov.

Eugryllacris crassicauda View in CoL sp. nov.

Figs. 4G View FIGURE 4 , 5C View FIGURE 5 , 7 View FIGURE 7 F–G, 9K

Material examined. Holotype (female): Thailand: Chiang Mai, foothills of Doi Suthep, near Huei Kaeo Waterfall , elev. 400–500 m (18°48'N, 98°57'E), 15.ix.1993, roadside vegetation, leg. S. Ingrisch (Bonn ZFMK). GoogleMaps

Other specimens: Same locality as holotype, 11.ix.1989, leg. S. Ingrisch— 2 females (paratypes) (Bonn ZFMK).

Diagnosis. This medium sized new species is characterized by and unique for a wide, stout and upcurved projection of the female seventh abdominal sternite ( Figs. 7 View FIGURE 7 F–G) together with a long, straight ovipositor ( Fig. 9K View FIGURE 9 ) and for the shape of the female subgenital plate, which has the whole ventral surface grooved except for the stiffened rim ( Fig. 7G View FIGURE 7 ). A little similar shape of both structures can be found in E. sarawaccensis ( Karny, 1928a) , but in that species the process of the seventh sternite is distinctly shorter and less wide, and the subgenital plate has a longer narrow apical area.

Description. Medium sized species, rather small for the genus ( Fig. 4G View FIGURE 4 ). Head: Face ovoid; fastigium verticis about twice as wide as scapus; ocelli indistinct; fastigium frontis separated from fastigium verticis by a very fine suture; a pair of short, weak furrows, starting at internal angles of the antennal scrobae, outline the fastigium frontis; subocular furrows present ( Fig. 5C View FIGURE 5 ). Abdominal tergites two and three with very minute stridulatory pegs (0, 3; 2, 7; n = 1 female).

Wings little surpassing hind knees ( Fig. 4G View FIGURE 4 ). Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius; media posterior absent; cubitus anterior forks before mid-length into two veins, CuA1 and CuA2; in holotype on left tegmen both CuA and CuP undivided single veins, on right tegmen CuA divided into two branches; cubitus posterior undivided, free throughout or in one female with a common base with first analis; with 5 anal veins.

Legs: Fore coxa with a rather large spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with 4 pairs of large, on mid tibiae comparatively short, ventral spines and one pair of smaller ventral spurs; hind femur with 6–9 external and 4–7 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 discolored brownish (green when alive); vertex unicolored; disc of pronotum unicolored, hind margin hardly darker. Legs of general color. Face unicolored green; eyes red brown. Tegmen semi-transparent greenish with green veins; in central area of tegmen some cells with dark brown flecks; hind wing semi-transparent greenish white with green-brown veins and veinlets; cells with large dark brown spots.

Male unknown.

Female. Seventh abdominal sternite elongate, longer than wide, surface vaulted, in basal half to two thirds lateral margins roundly converging, apical area beam-like and in lateral view little upcurved, fitting in a groove of the subgenital plate ( Figs. 7 View FIGURE 7 F–G). Subgenital plate at base little projecting dorso-laterad, afterwards with roundly converging lateral margins, at apex subtruncate to faintly concave; the greatest part of the subgenital plate occupied by a large and at base deep groove; in lateral view subgenital plate curved in an about 70°–80° angle and at very base with a small lateral groove. Base of ovipositor in the angle formed by the subgenital plate with a small sclerotised protuberance. Ovipositor elongate, only faintly curved dorsad, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 9K View FIGURE 9 ).

Measurements (3 females).—body w/wings: 33–35; body w/o wings: 27–31; pronotum: 6.0–6.5; tegmen: 23– 24; tegmen width: 8.5–10.0; hind femur: 14.5–15.5; antenna: 130–140; ovipositor: female 26–28 mm.

Etymology. The name of the new species refers to the rather wide beam-like projection of the female seventh abdominal sternite; from Latin crassus, crassa (thick).


Zoologisches Forschungsmuseum Alexander Koenig

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