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The genus    Gonatoxia    Karsch, which was synonymized with    Dapanera    Karsch by  Massa (2015) , is re-established. Data on habitat, biology, ecology, the acoustics and on chromosomes are provided as well as a key to the species. The male of    G.   immaculata    Karsch and the female of    G.   maculata    Karsch are described.    G.   furcata    sp. n.  from the Udzungwa Mountains of Tanzania and    G.   helleri    sp. n.  inhabiting coastal and lowland wet forest are newly described. All species have calling songs consisting of very short, resonant syllables, produced in species specific intervals, and with peak carrier frequencies between 13 and 24 kHz. In respect to chromosome numbers    Gonatoxia    species showed extreme differences (from 29 to 7) suggesting rapid evolutionary changes.    G.   helleri    sp. n.  so far is the tettigoniid species with the lowest number of chromosomes at present.    Gonatoxia    species may be used as bioindicators, their presence suggesting valuable habitats that are vanishing rapidly in East Africa.

deutsche entomologische zeitschrift

Spotted males, uniform females and the lowest chromosome number in Tettigoniids recorded: Review of the genus    Gonatoxia    Karsch (  Orthoptera  ,   Phaneropterinae  )