Nannogryllacris Karny, 1937

Hugel, Sylvain, 2009, Gryllacrididae and Tettigoniidae (Insecta, Orthoptera, Ensifera) from Espiritu Santo, Vanuatu, Zoosystema 31 (3), pp. 525-576 : 542-544

Genus Nannogryllacris Karny, 1937 ( Figs 5-7 )

Nannogryllacris Karny, 1937: 133 .

TYPE SPECIES. — Gryllacris exigua Brunner von Wattenwyl, 1888 .

DIAGNOSIS (IN ADDITION TO THE ABOVE- MENTIONED CHARACTERS SHARED WITH AMPHIBOLOGRYLLACRIS ). — Size: small; body length: 12.5-20 mm; FIII: 6.2-12 mm; FW: 9-17 mm. Colour: light brown, without clear black drawings (neither on face, pronotum, abdomen, legs); FW veins concolourous with the FW cells. Cerci usually reduced, not much longer than male styli. Mesosternum and metasternum lobes rounded.

REMARKS

This genus and the five species belonging to it are omitted in Otte (2000).

Nannogryllacris niaoulii Kaltenbach, 1968 is often omitted in available databases.

Karny (1937) considered Amphibologryllacris and Nannogryllacris as extremely closely related and gave only colour characters to distinguish them.

TENTATIVE KEY TO ADULT NANNOGRYLLACRIS KARNY, 1937 SPECIES Abdominal apex is lacking in N. exigua ( Brunner von Wattenwyl, 1888) .

1. FW with M not visible on the base, fused with R from the base to the FW proximal third ( Fig. 7A ); male cerci not longer than styli ( Fig. 6J ); female SGP preceding sternite with a cuneiform posterior projection ( Fig. 6D ); ovipositor shorter than FIII ......... ............................................................................................................. N. novaguineae

— FW with M visible on the base, sometimes lying in contact to R, sometimes anastomosed with R ( Fig. 7 C-E); male only known in N. niaoulii ( Kaltenbach, 1968) without styli; when known, female SGP preceding sternite unmodified or with a lobiform or furciform appendice, not with a cuneiform appendice; ovipositor shorter, as long as, or longer than FIII ........ 2

2. FW with Cu simple (not furcated, Fig. 7C, E ); head without conspicuous ocelli; when known, SGP preceding sternite unmodified; when known, male SGP without styli; when known, ovipositor much (c. ⅓) longer than TIII ........................................................ 3

— FW with furcated Cu ( Fig. 7B, D ); head with or without conspicuous ocelli; ♂ unknown; female SGP preceding sternite with a lobiform or a furciform projection; ovipositor at most as long as TIII .................................................................................................... 4

3. FW with 4 A veins ( Fig. 7C ); frons wide ( Fig. 6C ); ovipositor ⅓ longer than FIII ........ .................................................................................................................... N. niaoulii

— FW with 5 A veins ( Fig. 7E ); frons relatively narrower ( Fig. 6B ); ovipositor unknown ...................................................................................................................... N. exigua

4. FW with Cu at least furcated 3 times (at least 4 terminal branches; Fig. 7B ); head with conspicuous ocelli ( Fig. 6A ); female SGP preceding sternite furciform ( Fig. 6K ); ovipositor as long as FIII ......................................................................................... N. furciventris

— FW with Cu furcated 1 time (2 terminal branches; Fig. 7D ); head without conspicuous ocelli; female SGP preceding sternite lobiform ( Fig. 6F ); ovipositor distinctly shorter than FIII .............................................................................................................. N. heurnii

Figures

FIG. 5. — Amphibologryllacris Karny, 1937: A-C, A. ferruginea (Brunner von Wattenwyl,1888),typespecimens (NHW);D-F, A.dubia (Le Guillou, 1841), non type female from Fiji Islands, identified by Karny (Vana-Levu, Jalave, 1926, ZMUH); A, ventral view of male holotype terminalia; B, ventral view of female terminalia; C, lateral view of male holotype left femur III; D, ventral view of female terminalia;E, right side view of female subgenital plate and ovipositor; F, lateral view of left femur III.Scale bars:A,B,D, 1 mm; C, E, F, 10 mm.

FIG. 6. — Nannogryllacris Karny,1937:A, K, N. furciventris Karny, 1935, female holotype (NHW); B, N. exigua (Brunner von Wattenwyl, 1888),holotype after Kaltenbach (1968);C, H, I, N. niaoulii (Kaltenbach,1968),holotype after Kaltenbach (1968);D, E, J, N.novaguineae polygramma (Karny, 1928) (D and J after Karny [1928] and good quality pictures; E, female allotype [ZMB]); F, G, N. heurnii Karny, 1930, after Karny (1930b); A-C, face in frontal view; D, F, H, K, female terminalia in ventral view; E, G, I, left side view of ovipositor; J, ventral view of male terminalia. Scale bars: 1 mm.

FIG. 7. — Nannogryllacris Karny, 1937 forewing: A, N. novaguineae polygramma (Karny, 1928) left forewing after Karny (1928); B, N. furciventris Karny, 1935, female holotype left forewing (NHW); C, N. niaoulii (Kaltenbach, 1968), holotype and paratype, right forewing after Kaltenbach (1968); D, N. heurnii Karny, 1930, holotype right forewing,after Karny (1930b); E, N.exigua (Brunner von Wattenwyl,1888),holotype,left forewing.The grey dotted lines correspond to the claval fold. Scale bars: 10 mm.