Abstract
The genera Cestromoecha and Poreuomena of the tribe Poreuomenini in Phaneropterinae are revised and new generic characters are given for both genera, and six new species are described in Poreuomena. The newly described species are P. biaculeatasp. nov., P. ealasp. nov., P. gracilicercatasp. nov., P. ivorianasp. nov., P. matthaeisp. nov., and P. tshuapasp. nov. Based on characters defining the two genera, three species so far listed under Cestromoecha are transferred to Poreuomena: P. crassipes Karsch, 1890, P. laeglae (Massa, 2015), and P. magnicerca (Massa, 2013). One species of Cestromoecha, C. mundamensis Karsch, 1896, is synonymised with C. tenuipes (Karsch, 1890) since no morphological differences were detected between the type specimens. Thus, two species remain with Cestromoecha, and Poreuomena now contains 16 species. Morphological closely-related species of Poreuomena suggest rapid speciation in the Congo Basin due to several expansions and shrinkages of the Guineo-Congolian forest belt since the Oligocene. At least two different morphological lineages are discernible. On the other hand the genus Cestromoecha Karsch, 1893 is a species-poor taxon.
Highlights
Information on Phaneropterinae and other Orthoptera of Central to West Africa is sparse
We focus on the tribe Poreuomenini which includes the three genera, Cestromoecha Karsch, 1893, Poreuomena Brunner von Wattenwyl, 1878 and the monotypic Paraporeuomena Massa, 2018, tentatively included in the tribe
As forest-bound taxa the comparatively species-rich genus Poreuomena very likely diversified in the course of several expansions and shrinkages of the Guineo-Congolian forest belt caused by large-scale climatic changes
Summary
Information on Phaneropterinae and other Orthoptera of Central to West Africa is sparse. Comparing all species we found that a further typical character of Poreuomena is flaps on both tegmina – both with stridulatory files on the underside (Figs 6–8). Res. 22: 142; type locality: Central African Republic, Dzanga-Ndoki National Park (BMPC).
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