Ocellarnaca angulata Gorochov, 2004

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: 72

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Ocellarnaca angulata Gorochov, 2004


Ocellarnaca angulata Gorochov, 2004 

Figs. 21View FIGURE 21 E–F, 22M–N, 23D–F, 24E, 101F

Material examined. Vietnam: Cat Ba N.P., (20°48'N, 107°0'20''E), 12–16.vii.2013, leg. J. Constant & J. Bresseel (I.G. 32.454)— 2 females, 2 males (Brussels RBINSAbout RBINS)GoogleMaps  ; ChamChu N. R., (22°12'N, 105°6'0''E), 8–12.vii.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)— 1 male (Brussels RBINSAbout RBINS)GoogleMaps  ; Hoang Lien NP, (22°21'N, 103°46'20''E), 1– 5.vii.2013, leg. J. Constant & J. Bresseel (I.G. 32.454)— 1 male (Brussels RBINSAbout RBINS)GoogleMaps  ; Hanoi prov., BaVi N.P., (21°4'4''N, 105°21'30''E), 25–29.vi.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)— 2 males (Brussels RBINSAbout RBINS)GoogleMaps  ; Hoa Binh Prov., Cuc Phuong National Park , (20°19'N, 105°36'30''E), 19–23.vii.2011, leg. J. Constant & J. Bresseel (I.G. 31.933)— 1 female, 2 males (Brussels RBINSAbout RBINS)GoogleMaps  ; Ngo Luong Nat. Res. , (20°26'16''N, 105°20'15''E), 25– 30.vii.2016, leg. J. Constant & J. Bresseel (I.G.: 33.282 GTI project)— 2 females, 1 male (Brussels RBINSAbout RBINS)GoogleMaps  ; Prov. Vinhfu, Tam Dao N.P., (21°31'N, 105°33'E), 25–28.viii.2010, leg. J. Constant & P. Limbourg (I.G. 31.668)— 1 male (Brussels RBINSAbout RBINS)GoogleMaps  ; VinhPhuc prov., MeLinh B.S., (21°23'38''N, 105°42'56''E), 30.vi.–1.vii.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)— 2 males (Brussels RBINSAbout RBINS)GoogleMaps  .

Description. Rather short and stout species ( Fig. 101FView FIGURE 101). Head: Face ovoid; forehead nearly smooth with some scattered impressed dots and very fine transverse riffles; fastigium verticis moderately wider than scapus, separated by a transverse suture from fastigium frontis; ocelli very distinct, light yellow; median ocellus very large ( Fig. 22MView FIGURE 22). Abdominal tergites two and three each with two rows of stridulatory pegs.

Wings shortened, in male about reaching tip of abdomen but not hind knees, in female leaving last abdominal tergites uncovered ( Figs. 21View FIGURE 21 E–F). Tegmen: Radius with two branches: both unforked or RS forked once; media anterior has a common stem with radius, arising as first posterior branch of radius at about end of basal third; media posterior absent; cubitus anterior undivided; cubitus posterior undivided, free throughout; with 5 anal veins.

Legs: Fore coxa with a large spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with 4 pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 6–8 external and 14–15 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one preapical spine; with 3 apical spurs on both sides.

Coloration. General color brown without distinct pattern except for wings; vertex with dark spots at internal margins of compound eyes, variation: male with black spot at hind margin of pronotum, male with black hind margin. Face uniformly brown except for light ocelli; mandibles black. Tegmen dark brown with light colored veins and veinlets; hind wing yellowish or light brown, veins little darker, the cells between veins and cross-veins with a dark brown spot in middle, borderlines light.

Male. Ninth abdominal tergite globular, apical surface furrowed and then angularly divided, medio-ventral angles extended into a narrow, little curved and dorsally flattened process with acute tip; above base of process with another process that is black, dorso-ventrally compressed but little vaulted and with rounded tip ( Figs. 23View FIGURE 23 D– E). Subgenital plate wider than long with medial furrow, posterior-central area little depressed, lateral margins convex, apical margin truncate but at end of medial furrow little projecting; styli shorter than plate, inserted inside of latero-apical angles ( Fig. 23FView FIGURE 23).

Female. Seventh abdominal sternite prolonged, simple; with 2 small membranous extensions at hind margin. Subgenital plate wide at base with concave, approaching lateral margins, apical margin roundly excised, on both sides with subacute angles; basal and central areas and lateral margin in mid-length membranous, only lateral margin at base and apical area sclerotised; lateral margins in apical area strongly swollen with widening furrow in between ( Fig. 24EView FIGURE 24). Ovipositor elongate, strongly curved in basal area, slightly curved thereafter, lateral surface furrowed, margins gradually approaching towards apex; tip subacute ( Fig. 22NView FIGURE 22).

Measurements (12 males, 5 females).—body w/wings: male 22–32, female 28–34; body w/o wings: male 22– 32, female 24–34; pronotum: male 6.0–7.5, female 7.0–8.5; tegmen: male 8.0–18.5, female 10–18; tegmen width (in large specimens): male 7.5, female 7; hind femur: male 14.0–18.5, female 17.0–18.5; antenna: male 85–170, female 100–150; ovipositor: female 19–21 mm. There is a remarkable polymorphism in size and wing length between populations.


Royal Belgian Institute of Natural Sciences