Cleostratoides exoticus Storozhenko

Storozhenko, Sergey Yu., 2013, A new genus of the subfamily Metrodorinae (Orthoptera: Tetrigidae) from Vietnam, Zootaxa 3647 (1), pp. 96-100 : 97-100

Cleostratoides exoticus Storozhenko , sp. nov.

Figs. 1–12

Material examined. Holotype – male, Vietnam: Gia Lai Province, 20 km N Kannack, Buon Luoi, 1–10 May 1995 (A.V. Gorochov).

Description. Male. Body medium sized. Fastigium of vertex measured near the middle of eyes 1.8 times broader than width of one eye from above. Length of median carina of frontal ridge equal to width of 1st antennal segment. Antennae elongated, mid segments (6th-8th) narrow, 5.5-6.5 times as long as wide. Posterior process of pronotum with low and almost straight median carina. Lateral carinae in prozona well defined and serrated; prozona transverse, its width 1.7 times more than its length. Dorsal side of pronotum between shoulders with a pair of long and slightly curved abbreviated carinae; lateral carinae in posterior process well defined, low. Tegmina ovate, visible part of tegmen 2.8 times as long as wide; hind wings long, with scalloped inner margin. Fore femur 4 times, mid femur 3.8, hind femur 3.4 times as long as wide. First segment of fore legs 2.5 times shorter than second segment (without claws). Upper side of hind tibia distinctly serrated, with 5 outer and 4 inner teeth. First tarsal segment of hind legs 1.1 times longer than 3rd segment (without claws); two basal pads of first tarsal segment of hind legs slightly larger than apical pad. Epiproct triangular, with pointed apex. Subgenital plate in ventral view 1.5 times as long as wide, with bifurcate apex. Cerci with pointed apex, 1.5 times as long as wide near the base.

General coloration of male body brownish. Eyes and head from above light brown; face with transverse black stripe between eyes and with two longitudinal black stripes below antennal sockets; gena light brown; labrum shining black; maxillary palps and mandibles light brown; 1st and 2nd segments of antennae black, 3rd-11th segments brown with light brown apices. Disc of pronotum dark brown with few indistinct black spots; upper part of lateral lobes of pronotum blackish brown, lower part of lateral lobes light brown. Fore and mid femora brown with blackish marks; fore and mid tibiae light brown with two broad black rings (one in basal portion and another in apical third); 1st tarsal segment of fore and mid legs black, 2nd segment light brown with black rings near the base and apex. Hind femora brown with dark spots; hind tibiae blackish brown with two light rings (one near the base and one near the apex); 1st and 2nd tarsal segments of hind legs light brown with small black spot at apex; 3rd segment light brown with black rings situated near the base and apex. Tegmina blackish with brown veins, without stripes or spots. Hind wings hyaline, with black stripe around anterior margin. Abdomen brown, with blackish longitudinal stripes. Subgenital plate blackish brown. Cerci brown.

Female unknown.

Measurements (in mm). Length of male body (from the anterior margin of head to the apex of abdomen) 7.2; antenna 2.5 (apical two segments broken); pronotum 10.9; tegmen 1.4; hind wing 9.5; fore femur 1.8; mid femur 1.9; hind femur 4.7.

Distribution. Vietnam: Gia Lai Province.

Ethymology. The species name is arisen from Latin adjective ‘ exoticus ’ for unusual combination of characters.

Discussion

Beside the Oriental genera of Metrodorinae , such as Mazarredia , Xistrella , Pseudoxistrella Orthotettixoides , Bermania and some others, which are characterized by narrow, advanced and broadly rounded frontal ridge, only in Cleostratoides the lateral ocelli are situated just under fastigium of vertex and the antennal sockets are placed distinctly above the lower margin of eyes, like in the genus Cleostratus Stål, 1877 of the subfamily Cleostratinae Hancock, 1907 . However, in the latter genus, the fastigium of vertex is far produced beyond anterior margin of eyes and the median ocellus is situated near the middle of eyes (in Cleostratoides fastigium of vertex is not produced beyond anterior margin of eyes and median ocellus is placed distinctly below the lower margin of eyes, which is typical for the subfamily Metrodorinae ).

Figures

FIGURES 1 – 9. Cleostratoides exoticus sp. nov., male. 1, head and anterior part of pronotum, lateral view; 2, head, frontal view; 3, head and anterior part of pronotum, dorsal view; 4, antenna, dorsal view (two broken apical segments dotted); 5, fore leg, lateral view; 6, hind femur and tibia, lateral view; 7, hind tarsus, lateral view; 8, apex of abdomen, lateral view; 9, the same, ventral view. Scale bars 1 mm.

FIGURES 10 – 12. Cleostratoides exoticus sp. nov. 10, male body, dorsal view; 11, the same, lateral view; 12, male head, frontal view.