Eugryllacris serricauda, 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 : 36-37

publication ID 10.11646/zootaxa.4510.1.1

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Eugryllacris serricauda

sp. nov.

Eugryllacris serricauda View in CoL sp. nov.

Figs. 2E View FIGURE 2 , 4E, 4J View FIGURE 4 , 5B View FIGURE 5 , 6 View FIGURE 6 E–F, 7E, 9L, 100A

Material examined. Holotype (male): Thailand: Nakhon Nayok, Khao Yai , elev. 700 m (14°23'N, 101°23'E), 15– 18.x.1990, leg. S. Ingrisch— 1 male (Bonn ZFMK). GoogleMaps

Other specimens: Same locality as holotype, 5.iv.1995, leg. S. Ingrisch— 1 female (paratype) (Bonn ZFMK).

Diagnosis. E. serricauda is the so far only species of the genus, in which the projections of the male ninth abdominal tergite are not tooth- or spine-like but disc-shaped with serrate margin; below that disc there is a small inconspicuous tooth ( Figs. 6 View FIGURE 6 E–F).

Description. Large species ( Figs. 4E, 4J 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 distinct subantennal furrows, starting at internal angle of antennal scrobae, separates the central area of face from the lateral areas and fuse ventrally with clypeo-frontal suture; clypeo-frontal suture interrupted in middle; subocular furrows also distinct ( Fig. 5B View FIGURE 5 ). Abdominal tergite three only with extremely minute stridulatory pegs.

Wings reaching about tip of stretched hind tibiae ( Fig. 4E 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 midlength into two veins, CuA1 and CuA2; cubitus posterior undivided, free throughout; 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 four pairs of large, on mid tibiae comparatively short, ventral spines and one pair of smaller ventral spurs; hind femur with 5–10 external and 6–7 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 uniformly green when alive ( Fig. 100A View FIGURE 100 ); vertex unicolored; disc of pronotum unicolored, hind margin hardly darker. Legs of general color. Face unicolored green; eyes red brown; basal angles of clypeus black (female) or green and clypeo-frontal sutures darkened (male). Tegmen semi-transparent white with green veins; in center yellowish infumate; hind wing semi-transparent white with green veins; apart from marginal areas cells with large dark brown spots.

Male. Ninth abdominal tergite semi-globular: prolonged and down-curved laterally and apically; in descending posterior area furrowed in midline and before apex split and granular, on both sides of the split area with a small disc with granular margin and below that disc with a fine styliform projection, both projecting mediad ( Figs. 6 View FIGURE 6 E– F). Epiproct and paraproctes distinct. Subgenital plate almost twice as wide as long; apical margin wide, slightly obtuse-triangularly excised; styli inserted laterally at apical margin. Phallus membranous.

Female. Seventh abdominal sternite together with its apical projection appearing triangular with rounded angles; apical projection covering centro-basal area of subgenital plate. Subgenital plate elongate triangular with rounded apex; only margin and a small area at tip sclerotised, remainder membranous and shallowly grooved ( Fig. 7E View FIGURE 7 ). Base of ovipositor with a small sclerite before base of ventral valves. Ovipositor of medium length, distinctly but not strongly curved dorsad, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 9L View FIGURE 9 ).

Measurements (1 male, 1 female).—body w/wings: male 54, female 58; body w/o wings: male 36, female 43; pronotum: male 8, female 9; tegmen: male 40, female 42; tegmen width: male 16; hind femur: male 18, female 19; antenna: male 110; ovipositor: female 17 mm.

Etymology. The name of the new species refers to the apical projections of the male ninth abdominal tergite. From Latin serre (serrated) and cauda (tail).


Zoologisches Forschungsmuseum Alexander Koenig

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