Pteranabropsis angusta, Ingrisch, 2019

Ingrisch, Sigfrid, 2019, Review of the genus Pteranabropsis (Anostostomatidae: Anabropsinae) with description of six new species, Journal of Orthoptera Research 28 (2), pp. 107-124 : 109-111

Pteranabropsis angusta sp. nov. Figs 1F , 2D , 2L , 3J-N , 6H-I , 7K-N

Holotype (male). -

Vietnam: Hoa Binh Prov., Cuc Phuong National Park, 20°19'N, 105°36'30"E, 11-18.viii.2010, leg. J. Constant & P. Limbourg (I.G. 31.668) - (Brussels, ISNB).

Other specimens examined. -

same data as holotype - 1 male (paratype) (Brussels, ISNB) .

Diagnosis. -

The new species is similar to P. carli but has shorter wings that reach, but do not surpass, the hind knees; the tegmina are narrower and the hind wings smaller. The genicular area of the hind legs is pale but not whitish as in P. carli . The main diagnostic character to differentiate this species from P. carli and other species of the genus is the shape of the apical area of the male paraproctal outgrowths that have the apical area upcurved as in P. carli but longer, near the end are dorso-ventrally compressed instead of laterally compressed, and carry at the tip a stiffened pad pointing apically instead of a dorsal stiffened margin. The curvature of the external margin of the metasternal lobes is stronger than that of the internal margin but markedly less strong than in other species of the genus with conically extended metasternal lobes. Further differences to other species are outlined in the key.

Description. -

Medium sized species; habitus as genus. Prosternal lobes compressed triangular, subacute; mesosternal lobes in basal area moderately wide, afterwards elongate conical to nearly cylindrical with obtuse to subtruncate tip; metasternal lobes compressed, with concave internal and convex external margins; gradually passing over into conical, nearly sub-cylindrical, apical area with obtuse tip (Fig. 2L ).

Wings just reaching hind knees (Fig. 1F ). Fore wings 2.6-2.7 × longer than wide. Venation: radius with radius sector arising between middle and apical third of tegmen; media anterior fused or sub-fused in basal area with radius, separating near end of basal third. In one male the media then divides before mid-length into two branches and the cubitus anterior also simply divides before mid-length into two branches; in the other male on right tegmen only, media anterior, after separation from radius, fuses with a first branch of cubitus anterior and shortly after divides into two branches, while on this tegmen, cubitus anterior divides twice and the first anterior branch fuses with media and shortly after cubitus anterior divides again into two simple branches; cubitus posterior free and undivided, with 5 anal veins, the last one incomplete. Hind wings cycloid, distinctly wider than long (1.70-1.76 ×).

Legs. Fore coxa with a strong spine at swollen anterior surface and mid-coxa with a smaller spine at anterior margin. Fore and middle femora with 2-3 small spines at anterior-ventral margins. Hind femora with 7 external and 6 internal small spines on ventral margins; hind tibiae with dorsal spines on inner margin larger than on outer margin, ventral margins with few minute spinules; both sides with 4 apical spurs, the dorsal two pairs very large, the following pair medium, the ventral-most pair small; internal spurs larger than external counterparts; ventral margin with 2 external and 1 internal spinules.

Male. Paraproctal outgrowths long, roughly cylindrical, widening in apical area with dorsal margin upcurved, later straight and terminating into a compressed vertical lamella in dorsal area of apical margin, ventral margin broadly rounded (Fig. 3J-N ). Epiproct elongate-triangular with slightly sinuate, stiffened and slightly elevated lateral margins. Subgenital plate with lateral margins upcurved and narrowing posteriorly; ventral surface behind basal third with obtuse lateral carinae, nearly parallel in about apical third; in apical area also with a faint median carina; apical margin concave, on both sides with a substraight stylus (Fig. 2D ). Phallus membranous (Fig. 7K-N ).

Female unknown.

Coloration. -

Brown with light and dark spots. Face blackish-brown mixed with yellowish, pale to almost white spots; ocelli distinct. Tegmen semi-transparent, suffused with yellowish-brown except in anterior area, and provided with dark brown spots. Hind wings semi-transparent, slightly smoky.

Measurements. -

(2 males). In mm. Body w/wings: 48; body w/o wings: 33-40; pronotum: 9.0-9.2; tegmen: 33.5-34.0; tegmen width: 12.5-13.0; hind femur: 31-32; antenna: 80.

Etymology. -

The new species is named for its comparatively narrow wings; from Latin angustus, Pteranabropsis angusta narrow, slim.

Figures

Fig. 1. Habitus dorsal view of Pteranabropsis species. A. P. carli (Griffini, 1911) female; B. P. cuspis sp. nov. male; C-E. P. copia sp. nov. male (C), female from Copia (D), and female from Hoang Lien (E); F. P. angusta sp. nov. male; G. P. bavi sp. nov. female; H. P. guadun sp. nov. female; I. P. pusilla sp. nov. male; J. P. carnarius Gorochov, 1998 male. Scales 10 mm.

Fig. 2. A-G. Male subgenital plate; H. Thoracic sternites; I-P. Metasternum of Pteranabropsis species: P. carli (Griffini, 1911) (A, J); P. cuspis sp. nov. (B, H); P. copia from type locality (C, M); P. angusta sp. nov. (D, L); P. carnarius Gorochov, 1998 (E, N); P. pusilla sp. nov. (F, O); P. guadun sp. nov. (G, P); P. copia from Hoang Lien (I); P. bavi sp. nov. (K). Abbreviations: c 1 - fore coxa, c 2 - mid coxa, c 3 - hind coxa, s 1 - prosternum, s 2 - mesosternum, s 3 - metasternum, th - throat with lateral hemispherical sclerites and pair of papillae, pr - underside of pronotum. Scales 1 mm.

Fig. 3. Male paraproctal outgrowths in full or only apical area in lateral (A-D, F-G, J-K), apical (E, I, L, M), ventro-apical (H), and dorsal view (N). A-D. P. carli (Griffini, 1911) four males from Tam Dao (A-B), Cuc Phuong (C), and Ngo Luong (D); E-I. P. cuspis sp. nov. two males from Ngo Luong; J-N. P. angusta sp. nov. two males from Cuc Phuong. Scales 1 mm.

Fig. 6. A-E. P. carli (Griffini, 1911) male from Ngo Luong (A-D) and Tam Dao (E); F-G. P. cuspis sp. nov. male; H-I. P. angusta sp. nov. male; J-M. P. carnarius Gorochov, 1998 male (J) and female from Tam Tao (K-L) and from BaVi (M); N-O. P. pusilla sp. nov. female; P-R. P. guadun sp. nov. female; S-V. P. copia sp. nov. female (S-T) and male (U-V) from Copia. - Fore tibia external side (A, F, H, K, N, P, S) and internal side (B, E, G, I-J, L, O, Q, T); thorax in lateral view (C), prothoracic spiracle (D, M, R, V). Abbreviations: c 1 - anterior coxa, ms - mesothoracic pleurites, mt - metathoracic pleurites, s 1 - s 3 - first, second and third thoracic spiracles. Scales for legs and body, 5 mm; for tympana and spiracles, 1 mm.

Fig. 7. Male phallic complex of A-F. P. carli (Griffini, 1911) from Tam Dao (A-B), Cuc Phuong (C-D) and Ngo Luong (E-F); G-H. P. copia sp. nov.; I-J. P. cuspis sp. nov.; K-N. P. angusta sp. nov.; O-P. P. carnarius from Tam Tao; Q-R. P. pusilla sp. nov.; S-T. P. guadun sp. nov. in dorsal (A, C, F, G, I, L, M, O, Q, S) and in ventral (D, E, H, J, K, N, O, R, T) view, or in dorsal view with only dorsal lobes flipped proximad, ventral lobe distad (B). Scales 1 mm (all images).