Biogeographical and evolutionary aspects of a Guineo-Congolian bushcricket tribe: Revision of the genera Cestromoecha Karsch, 1893 and Poreuomena Brunner von Wattenwyl, 1878, with the description of new species (Orthoptera, Tettigoniidae, Phaneropterinae) Author Hemp, Claudia https://orcid.org/0000-0001-9170-7113 Dept Plant Systematics, Univ. of Bayreuth, Germany claudia.hemp@uni-bayreuth.de Author Massa, Bruno https://orcid.org/0000-0003-2127-0715 Dept of Agriculture, Food and Forest Sciences, University of Palermo, Italy text Deutsche Entomologische Zeitschrift 2021 2021-01-05 68 1 45 79 http://dx.doi.org/10.3897/dez.68.60193 journal article http://dx.doi.org/10.3897/dez.68.60193 1860-1324-1-45 227B739469C5447FB984250DF1ADFBE1 EE57E5591FE3500892459D0CF4FBB496 4435456 Poreuomena sanghensis Massa, 2013 Figs 91-96 Poreuomena sanghensis Massa, 2013. J. Orth. Res. 22: 140; type locality: Central African Republic, Dzanga-Ndoki National Park (MSNG). Material examined. Central African Republic , Dzanga-Ndoki National Park , Lake 1, UV trap , 10-12.II.2012 ( holotype ♂ ) (MSNG) ; same data 20-23.II.2012 ( allotype ♀ ) ; same data 8-10.II.2012 ( paratype ♂ ) ; same data 20-23.II.2012 ( 5 paratypes ♂ ) ; same data 31.I-2.II.2012 ( 1 paratype ♂ ) (BMPC) ; Central African Republic , Dzanga-Ndoki National Park , border of Lake 1, 13-14.II.2012 ( 2 paratypes ♂ ) (BMPC) ; Central African Republic , Dzanga-Ndoki National Park , Lake 1, camp 1, 14-15.II.2012 ( paratype ♂ ) (BMCP) ; Central African Republic , Dzanga-Sangha SR , Camp 3, 4-6.II.2005 ( 2♂ ) ; 10-11.X.2008 ; Camp 1, 14-15.X.2008 (light) ( 2♂ ) (PAPC); Central African Republic , Dzanga-Ndoki NP , Lake 1, 30.XI-1.XII.2010 (light) ( 1♂ ) ; Central African Republic , Dzanga-Ndoki NP , Lake 1, 25-26.I.2012 (light), 9-10.II.2012 , 10-11.II.2012 , 14-15.II.2012 (light) ( 6♂ ) (BMPC & PAPC) . Cameroon , Campo Ma'an National Park (lowland rainforest) ( 950 m alt.) 10-22.III.2018 ( MV Light Trap ), Fotsing, Ishmael, Miles, Safian ( 1♂ ) ; Cameroon , Campo Ma'an National Park (lowland rainforest) ( 950 m alt.) 10-22.III.2018 ( UV Cold Cathode Light Trap ), Fotsing, Ishmael, Miles, Safian ( 2♂ ) ; Gabon , Mikongo (Rougier), Mts de Cristal (secondary forest) ( 430 m alt.) 28.VII-12.VIII.2019 ( MV Light Trap ), Albert, Aristophanous, Bie Mba, Derozier , Moretto ( 3♂ ) (ANHRT). Diagnosis. Small and fragile species, green (alive) or brown (preserved) coloured, with a brown-reddish upper area of the abdominal tergites. The 10th abdominal tergite of P. sanghensis is similar to P. wilverthi , however, not downcurved, but produced posteriorly with a deep median fold. The male cerci are also similar between these two species, however, much more fragile-built in P. sanghensis . Description. Typical Poreuomena species with an elongate habitus (Fig. 91 ). Stridulatory area of the left tegmen short and straight (Fig. 92 ). The stridulatory file has ca. 40 teeth, of which 7-8 are proximally placed nearly perpendicularly to the others (Fig. 93 ). The ventral margins of the hind femora have 2 spines. The 10th tergite ends with two short reddish rounded flat lobes with an inner spine (Figs 94 , 95 ); the cerci have a wide round base, with an inner spine, then becoming narrower; upcurved and pointed apically (Figs 94-96 ). The male subgenital plate is stout, the processes are slender and incurved, forming a circular space between them (Fig. 96 ). Colour. Predominantly green when alive, brown to tawny when preserved; dorsal area of abdominal tergites brown-reddish. A black marking is present at the base of the tegmina of the male, absent in the female. Measurements (mm) . Males. Body length: 15.2-17.5; pronotum length: 3.0-3.2; pronotum height: 2.5-2.7; length hind femora: 16.0-18.8; length of tegmina: 23.6-24.8. Female. Body length: 19.4; pronotum length: 3.3; pronotum height: 2.8; length of hind femora: 19.2; length of tegmina: 30.0; length of ovipositor: 3.9. Distribution. Central African Republic (Dzanga-Ndoki National Park and Dzanga-Sangha Special Reserve), Cameroon ( Massa 2013 ; 2015 ), and Gabon (Massa, in press). Figures 91-96. Morphological details of male Poreuomena sanghensis . Habitus ( 91 ), stridulatory area ( 92 ), stridulatory file on the underside of the left tegminal flap ( 93 ), rear ( 94 ) and lateral ( 95 ) view on apex, subgenital plate ( 96 ).