Morgenia angustipinnata Massa, 2018

Massa, Bruno, Heller, Klaus-Gerhard, Warchalowska-Śliwa, Elzbieta & Moulin, Nicolas, 2018, The tropical African genus Morgenia (Orthoptera, Tettigoniidae, Phaneropterinae) with emphasis on the spur at the mid tibia, Deutsche Entomologische Zeitschrift 65 (2), pp. 161-175 : 165

Morgenia angustipinnata Massa sp. n. Figs 6 , 16 , 24 , 31 , 45 , 46

Material examined.

Central African Republic, Dzanga-Ndoki National Park , Mboki (5°18 ’31” N, 25°57 ’16” E), 24.I.2012 (light), Sangha 2012 team (1♂ holotype, MSNG); Dzanga-Sangha Special Reserve at 35m on canopy of Terminalia superba (02°20 ’03.0” N, 16°08 ’11.2” E, 375m) 9.II.2005, P. Annoyer (1♂ paratype, BMPC); same locality 13-23.II.2012 (light), Sangha 2012 team (2♂ paratypes, BMPC) .

Distribution.

At the present time, known only from the type locality, Dzanga-Ndoki National Park (Central African Republic).

Colour.

Head and pronotum yellow-green, antennae yellowish, abdomen yellow-brown, cerci yellow, tegmina with a black line at base, green with brownish stridulatory area. One black spot between tympana of fore tibiae.

Description.

Males. Head and antennae. Fastigium of vertex narrow, sulcate above, not contiguous with fastigium of frons. Eyes rounded, well projecting. Antennae longer than body. Legs. Fore coxae armed with a small spine. Fore tibiae furrowed on upper margin, distinctly widening above tympanum, conchate on inner, open on outer side. Fore femora armed on inner ventral side with 3-4 small spines, fore tibiae with 3 spines + 1 spur on inner side and 3 spines + 1 spur on outer ventral side, mid femora with 4-5 spines on outer ventral side, mid tibiae with 6-7 spines on outer and 3-4 on inner ventral sides. The inner ventral spur of mid tibiae is more apically located, short, up-curved and does not exceed the base of the first tarsal article; its length is about 2.5-3.0% the length of tibia. On the outer ventral margin of mid tibiae, three close short spines are present (Fig. 31 ). Hind femora armed with 3-4 small spines on outer and on inner ventral sides, hind tibiae with many spines on ventral and dorsal sides + 3 spurs on each side. Thorax. Pronotum narrowing at the level of the humeral sinus, flat above, lateral margins rounded, anterior margin incurved, posterior margin rounded, humeral sinus well developed, lobes of pronotum rounded. Tegmina very narrow with rounded apices (Figs 6 , 16 , measurements in Table 1 ), wings longer than tegmina. Stridulatory area of the left tegmen raised and stout. Mirror of the right tegmen smaller than in M. hamuligera (Fig. 14 ). Costal area of tegmina with a net of small cells (Fig. 16 ); stridulatory file 1.7 mm long, arched, composed of ca. 70 widely spaced teeth (Fig. 24 ). Cerci club-shaped with an apical spine, the inner part is concave, the outer rounded. Subgenital plate long and narrow, with a small concavity, interior margins undulate in ventral view with tips rather straight in lateral view (Figs 45 , 46 ).

Diagnosis.

Tegmina of M. angustipinnata sp. n. are very narrow (Table 1 ); their costal area has a net of small cells. The stridulatory file is 1.7 mm long, arched, composed of ca. 70 widely spaced teeth and the spur of the mid tibia is very short. Differences to other species of the genus are summarised in Table 2 .

Etymology.

From Latin angusta = narrow, and pinnata = winged.

Figures

Figures 5 - 8. Habitus of the male of Morgenia spathulifera (5), M. angustipinnata sp. n. (6), M. melica (7) and M. modulata (8) (left side).

Figures 15 - 18. Stridulatory area of left tegmen and mirror of right tegmen of the male of Morgenia plurimaculata sp. n. (15), M. angustipinnata sp. n. (16), M. melica (17) and M. modulata (18). Arrows in M. plurimaculata sp. n. and M. angustipinnata sp. n. show the net of small cells in costal area of their tegmina, while in M. modulata the protruding stridulatory area.

Figures 23 - 26. Stridulatory file of the left tegmen in the male of Morgenia spathulifera (23), M. angustipinnata sp. n. (24), M. melica (25) and M. modulata (26).

Figures 27 - 34. Mid tibia showing the inner spur in the male of Morgenia hamuligera (27), M. rubricornis (28), M. plurimaculata sp. n. (29), M. lehmannorum sp. n. (30), M. angustipinnata sp. n. (31), M. spathulifera (32), M. melica (33) and M. modulata (34).

Figures 45 - 50. Cerci and subgenital plate of male of Morgenia angustipinnata sp. n. (45 lateral, 46 ventral), M. melica (47 lateral, 48 ventral) and M. modulata (49 lateral, 50 ventral).

Figures 9 - 14. Stridulatory area of left tegmen and mirror of right tegmen of the male of Morgenia hamuligera (9), M. rubricornis (10), M. spathulifera (11), M. lehmannorum sp. n. (12); habitus of M. hamuligera after Brunner von Wattenwyl (1878) (13) and of M. rubricornis after Sjoestedt (1913) (14). Arrow shows the particular net of small cells in the costal area of tegmina of M. spathulifera, present also in M. lehmannorum sp. n.