Eucriotettix anisyutkini Storozhenko et Dawwrueng

Storozhenko, Sergey Yu. & Dawwrueng, Pattarawich, 2015, New and little-known pygmy grasshoppers (Orthoptera: Tetrigidae) from Thailand, Zootaxa 4052 (5), pp. 527-554 : 537-538

Eucriotettix anisyutkini Storozhenko et Dawwrueng , sp. nov.

Figs 10–16

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:472692

Material examined. Holotype—female, Thailand: Nakhon Ratchasima Province, environs of National park Khao Yai, 500–1000 m, 26 October–4 November 2000, coll. A. Gorochov and L. Anisyutkin ( ZISP). Paratype: Thailand: 1 female, same data as in holotype ( ZISP).

Description. Female. Body medium-sized for the genus. Antennae filiform, 14-segmented, 1.7–1.9 times as long as the fore femur; middle segments (7–9th) 6.5–7.5 times as long as wide. Antennal sockets situated between the lower margins of the eyes. Fastigium of the vertex 1.1 times narrower than one eye seen from above; median carina of the fastigium short; tranverse carina in frontal view U-shaped; supraocular lobes distinct. Eyes protruding above the pronotum in lateral view. Lateral ocelli situated between the middle of the eyes. Frontal ridge broadly rounded in lateral view. Width of frontal ridge near the base of the antennae 0.6–0.8 times the width of the 1st antennal segment. Pronotum in dorsal view with a straight anterior margin; posterior process of the pronotum reaching the basal quarter of the hind tibiae. Median carina of the pronotum in profile low, weakly raised behind the prozona, gently sinuate in the middle, and almost straight in the posterior part. Lateral carinae in the prozona well defined and slightly incurved posteriorly; prozona transverse, its width 1.2 times its length. Disc of the pronotum gently depressed between the prozona and the humeral angles, with a pair of long interhumeral carinae; posterior process of the pronotum with numerous tubercles. Hind margin of the lateral lobes of the pronotum with a tegminal (upper) sinus as deep as the lower sinus; lower side of the lateral lobes of the pronotum in dorsal view forming a short and sharp spine directed ahead. Tegmina ovate, with broadly rounded apex; visible part of the tegmen 2.2–2.4 times as long as wide; width of the visible part of the tegmen equal to the width of the mid femur. Hind wing almost reaching or slightly surpassing the apex of the posterior process of the pronotum. Upper and lower sides of fore and mid femora straight and densely serrate. Fore femur 4.2–4.3 times, and mid femur 3.0–4.0 times as long as wide. Upper side of hind femur serrate, lower side smooth. Hind femur 2.9–3.1 times as long as wide. Upper side of hind tibia with 5–7 outer and 3–4 inner teeth. First tarsal segment of hind leg 1.6–1.7 times as long as the 3rd segment (without claws); ventral side of the 1st segment with 3 distinctly pointed pads, apical pad slightly longer than the other pads; 3rd segment not swollen. Epiproct triangular, with pointed apex. Subgenital plate subsquare, posterior margin of plate distinctly triangular near the middle. Cerci conical, with pointed apices, 1.5 times as long as wide near the base. Valves of the ovipositor short, dentate; length of the upper valve 3.8 times its maximum width; length of the lower valve 6.2 times its maximum width.

Head dorsally brown with blackish marks; eyes and ocelli whitish; antennae brown with blackish apical segments. Genae and frons light brown with indistinct blackish marks; labrum whitish with black apical stripe, mandibles pale brown, maxillary palpi whitish. Disc of pronotum brown with small blackish and whitish marks; lateral lobes of pronotum brown. Visible part of the tegmina brown with numerous small black spots. Anterior margin of hind wings black with few whitish spots near apex. Fore and mid femora brown with two indistinct blackish stripes. Fore and mid tibiae blackish brown with 3 narrow pale rings. Fore and mid tarsi black with whitish base of 2nd segment. Hind femur brown with few indistinct blackish spots on outer side; lower part of femur black with few brown marks. Hind tibia blackish brown with light ring near base. First tarsal segment of hind leg pale, 2nd segment blackish, 3rd segment pale with black apex. Tergites and epiproct brown with blackish marks. Sternites and subgenital plate pale brown. Cerci and ovipositor light brown.

Male unknown.

Measurements (mm). Length of female body 7.6–7.8; antenna 2.9–3.2; pronotum 8.9–9.3; tegmen 1.1–1.2; fore femur 1.7; mid femur 1.9–2.0; hind femur 5.3–5.5; ovipositor 1.1–1.2.

Distribution. Thailand (Nakhon Ratchasima Province).

Diagnosis. The new species is most similar to Eucriotettix hainanensis Günther, 1938 from China ( Günther, 1938b) but differs by the short pronotum, by the disc of the pronotum provided with tubercles, by the shape of the spine on the lower side of the lateral lobes of the pronotum, and by the colour of the hind femora (in the latter species the posterior process of the pronotum is almost reaching the apex of the hind tibiae, disc of the pronotum smooth, the spine on the lateral lobes of the pronotum is longer, and the hind femora are uniformly brown).

Etymology. The new species is named after its collector, Dr. L.N. Anisytkin.

Figures

FIGURES 10 – 12. Eucriotettix anisyutkini sp. nov., female. 10, body, dorsal view; 11, the same, lateral view; 12, head, frontal view. Scale bars 1 mm.

FIGURES 13 – 16. Eucriotettix anisyutkini sp. nov., female. 13, head and anterior part of pronotum, dorsal view; 14, apex of abdomen, lateral view; 15, the same, ventral view; 16, hind tarsus, lateral view. Scale bars 1 mm.