Trusmaditetrix, STOROZHENKO, 2023

STOROZHENKO, SERGEY YU., 2023, New curious genus of the subfamily Cladonotinae (Orthoptera: Tetrigidae) from Borneo Island with remarks on the classification of this subfamily, Zootaxa 5315 (1), pp. 59-70 : 60

Type genus: Trusmaditetrix gen. nov.

Description. Body distinctly compressed dorso-vernally or conspicuously flattened, small size for subfamily (length of pronotum 2.8–8.1 mm). Antennae filiform, 14–16-segmented. Fastigium of vertex wider than width of one eye from above, flat or slightly concave; middle carina distinct; lateral carinae low or slightly elevated to form low horns; apex of vertex almost reaching or slightly surpassing the front of eyes from dorsal aspect. Frontal ridge above lateral ocelli long; below ocelli it narrow at the beginning but later suddenly expands, forming vaseshaped scutellum; width of ridge near the base of antennae 1.3–2.2 times broader than 1st antennal segment or rarely equal to it; in lateral view frontal ridge deeply excised between eyes. Eyes usually not raised above pronotum (except Ichikawatettix with considerably raised eyes). Lateral ocelli placed at level or in the lower quarter of the eye height. The top margins of the antennal grooves situated distinctly or a little below the level of compound eyes. Pronotum distinctly dorsoventrally compressed, which is evident by strongly flared-out lateral lobes in the genera Trusmaditetrix gen. nov., Planotettix Tumbrinck and Eurymorphopus Hancock , or conspicuously flattened in Devriesetettix Tumbrinck and Tepperotettix Rehn , while in Ichikawatettix Tumbrinck pronotun does not appear at a glance to be flattened. In dorsal view anterior margin of pronotum straight and not reaching poster margin of eyes. Median carina of pronotum in profile low, weakly excised or elevated before shoulders while in Planotettix biroi and P. cyclopensis carina forming two humps, the posterior of which situated at the base of hind femur. Shoulders (humeral angles) oblique, not projected outwards. Hind margin of lateral lobe of pronotum usually with lower sinus only (except Trusmaditetrix gen. nov.); lower part of lateral lobe directed outwards. Apterous, but in Trusmaditetrix tegmina and hind wings present. Lower side of fore and mid femora with lappets, rarely (in Ichikawatettix ) femora almost straight. First tarsal segment of hind legs as long as 3rd segment (without claws) with rounded pulvilli. Valves of ovipositor dentate.

Differential diagnosis. Asian and South Pacific Epitettigini easy recognizable from Trusmaditetrigini trib. nov. by shape of pronotum and tarsal segments of the hind legs (in Epitettigini , the third tarsal segment is considerably shorter than first one and the pronotum is not flattened). Caribbean Mucrotettigini differs from new tribe by archlike and relatively high median carina of the pronotum. Caribbean Choriphyllini, Madagascarian Valalyllini and African Xerophyllini easy recognizable from new tribe by strongly leaf-like body and by the ponotum forming a rostrum directed forward and covering head from above. From Asian and Pacific Cladonotini (s. str.) new tribe differs by the shape of pronotum (in genera Cladonotus Saussure, 1862 , Misythus Stål, 1877 , Deltonotus Hancock, 1904 , Diotarus Stål, 1877 , Piezotettix Bolívar, 1887 , and Boczkitettix Tumbrinck, 2014 , the pronotum with high anterior part forming a rostrum directed forward and covered head).

Composition. New tribe consists of 17 species in 6 genera distributed in the South Pacific Islands and Australia.