Thanmoia Ramme, 1941

Storozhenko, S. Yu., 2022, Review of the genus Thanmoia Ramme, 1941 (Orthoptera: Acrididae, Oxyinae), Far Eastern Entomologist 453, pp. 1-7 : 2-3

Genus Thanmoia Ramme, 1941

Thanmoia Ramme, 1941: 120 (type species: Thanmoia gustavi Ramme, 1941 , by monotypy);

Willemse, 1957: 483; Hollis, 1975: 207; Otte, 1995: 124; Yin et al., 1996: 698.

Annamacris Willemse, 1957: 479 (type species: Annamacris olivacea Willemse, 1957 , by original designation); synonymized by Hollis (1975: 207).

Oxyacris Willemse, 1957: 480 (type species: Oxyacris maculata Willemse, 1957 , by original designation); synonymized by Hollis (1975: 207).

DIAGNOSIS. Body large or medium-size for the tribe. Head shorter than pronotum. Face in profile reclinate ( Fig. 1 ). Fastigium of vertex from above rounded pentagonal; median carinula absent ( Fig. 2 ). Frontal ridge distinct, sulcate, with margins almost parallel ( Fig. 13 ). Eyes large, oval. Antennae filiform, longer than head and pronotum combined. Pronotum rugose or almost smooth, crossed by three transverse furrows; prozona distinctly longer than metazona; median carina vestigial;

lateral carinae absent; anterior margin of prozona almost straight; posterior margin of metazona triangularly rounded ( Fig. 2 ). Prosternal spine slender, conical, with subacute or rounded apex. Mesosternal lobes broad, subsquare or trapezoidal;

mesosternal interspace longer than wide. Tegmina and hind wings fully developed or somewhat shortened; parallel veinlets in radial and median areas on tegmen absent.

Hind femora slender; both dorsal and ventral median carinae smooth; ventral genicular lobes of hind knee with distinct apical spine ( Fig. 5 ). Hind tibiae apically expanded;

outer apical dorsal spine absent or rare very small. Hind tarsi short, not longer than the half of hind tibiae; third segment (without claws) as long as two others together;

arolium large, reaching the apex of claws. Male 10th abdominal tergite with weak furculae; supra-anal plate triangular, with a median basal impression; cerci conical;

subgenital plate short ( Fig. 4 ). Female supra-anal plate elongated, triangular, with a median basal impression; cerci conical; subgenital plate with triangle pointed apex.

Ovipositor long, elongated; dorsal valves dentate only at apical quarter; ventral valves straight and dentate along the full length ( Figs 11, 12 ). Male genitalia: epiphallus bridge-shaped, symmetrical; bridge completely divided; oval sclerite present (Figs

6–9); valves of cingulum short and almost straight; apical valves of penis shorter than valves of cingulum; basal valves of penis connected with apical ones by un-

broken flexure.

COMPOSITION. The genus consists of four species from Vietnam.

– T. ceracrifucosa : 1 – head and pronotum, lateral view; 2 – the same, dorsal view; 3 –

cercus, lateral view; 4 – apex of abdomen, dorsal view; 5 – hind femur, lateral view; 6 –

epiphalus, dorsal view; 7 – the same, T. maculata ; 8 – the same, T. gustavi ; 9 – the same, T.

olivacea.

Figures

Figs 1–9. Thanmoia spp., males (1–6 after Storozhenko, 1992; 7–9 after Hollis, 1975). 1–6

Figs 10–14. Thanmoia spp., females. 10, 11 – T. gustavi: 10 – body, lateral view; 11 –