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T. Pushkar

Tetrix Tuerki (Orthoptera, Tetrigidae): Distribution in Ukraine, Ecological Characteristic and Features of Biology

The presence of Tetrix tuerki (Krauss, 1876) in the Ukrainian Carpathian Mountains and Transcarpathian Region nowadays is confirmed. Three different morphological forms of T. tuerki are distinguished based on the wings and prothorax lengths: brachypterous, mesopterous and macropterous forms. Only two forms of adults (mesopterous and brachypterous) and the larvae of middle and the last instars hibernate. Adults of macropterous individuals of T. tuerki appear in June, developing from the hibernated larvae. Some larvae of T. tuerki are emerged from eggs and become the adults at the same year, transforming mesopterous and brachypterous forms. In spring T. tuerki (brachypterous and mesopterous individuals) lives on sandy-pebble alluvion of mountain river coasts, but in summer it (macropterous individuals) prefers alluvions near the middle part of the river far from its coasts. All three morphological forms of T. tuerki inhabit the middle flows of mountain rivers and the foothills outside a mountain system; brachypterous and mesopterous individuals are widespread in the upper reaches and in the lower flows of mountain rivers where alluvions are rare. Body length of specimens of T. tuerki, inhabiting upper and lower flows mountain rivers are smaller then in other river sides. Vibratory signals of T. tuerki are described for the first time and the oscillograms of the vibratory signals are provided.

Open access

S. Yu. Storozhenko and T. I. Pushkar

Abstract

Taxonomic review of the genus Yunnantettix Zheng, 1995 is given. It is similar to Aspiditettix Liang, 2009, Pseudepitettix Zheng, 1995, and Epitettix Hancock, 1907. Yunnantettix is the most similar to Aspiditettix in the general appearance, the rugose disc of the pronotum, and the bisinuate lateral lobe of the pronotum, and diff erent from it by the completely reduced hind wing and the position of the antennal socket. Yunnantettix is similar to Pseudepitettix and Epitettix in the moderately widened frontal ridge and low median carina of pronotum, but diff erent from the latter by the presence of the narrow tegmen and a shallow yet distinct tegminal (upper) sinus on the pronotal lateral lobe. Originally, Yunnantettix is a monotypic genus (type species: Yunnantettix bannaensis Zheng, 1995 from South China). Two species are additionally included to this genus: Yunnantettix elytratus (Günther, 1939), comb. n. (= Epitettix elytratus Günther, 1939) from India and Yunnantettix thaicus, sp. n. from Th ailand. Th e new species diff ers from all other species of this genus by the shallow excision on apex of the posterior pronotal process and by the external lateral pronotal carina, arch-like and strongly curved upward above the tegmen. A key to the species and redescription of the genus Yunnantettix are provided.