Morgenia lehmannorum Heller & 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 : 164-165

Morgenia lehmannorum Heller & Massa sp. n. Figs 4 , 12 , 22 , 30 , 39 , 40

Material examined.

Uganda, Semliki Forest National Park (00°49 ’30” N, 30°03 ’40” E) 1-31.VIII.2014, A. and G. Lehmann (♂ holotype) ( MfN) .

Distribution.

Presently known only from the type locality, Semliki Forest (Uganda).

Colour.

Green, with the exception of tympana of fore legs that are brown and one black spot between tympana. Stridulatory area brownish. Black spots at the base of tegmina.

Description.

Males. Head and antennae. Fastigium of vertex narrow, sulcate above, not contiguous with fastigium of frons. Eyes rounded, well projecting. Legs. Fore coxae armed with a fine 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 4 small spines, fore tibiae with 2 spines + 1 spur on inner ventral side and 1 spine + 1 spur on outer ventral side, mid femora unarmed, mid tibiae with 2 outer and 2 inner ventral spines, inner ventral spur of mid tibiae long, up-curved, exceeding ¾ of the first tarsal article; its length is about 10% the length of tibia. On the outer ventral margin of mid tibiae, three close short spines are present (Fig. 30 ). Hind femora armed with 3 small spines on outer and 3 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 straight, posterior rounded, humeral sinus well developed, lobes of pronotum rounded. Tegmina narrow with rounded apices (Figs 4 , 12 , measurements in Table 1), wings longer than tegmina. Stridulatory area of the left tegmen raised (Fig. 12 ). Mirror of the right tegmen smaller than in M. hamuligera (Fig. 12 ). Pattern of costal area of tegmina with a net of small cells; stridulatory file 1.8 mm long, arched and composed of ca. 100 teeth; the distal teeth of the stridulatory file are more widely spaced than the proximal ones, that are also more densely set together (Fig. 22 ). Cerci club-shaped with an apical spine, the inner part is concave, the outer rounded. Subgenital plate with a small apical concavity in ventral view with tips straight in lateral view (Figs 39 , 40 ).

Diagnosis.

M. lehmannorum sp. n. is characterised by narrow tegmina (Table 1), club-shaped cerci, a long and up-curved spur on the mid tibia, the stridulatory area brown, the costal area of tegmina with a net of small cells and the stridulatory file that is 1.8 mm long, arched and composed of ca. 100 teeth, the distal teeth are more widely, the proximal ones more closed set. Differences to other species of the genus are summarised in Table 2.

Etymology.

We have the pleasure to dedicate this species to the German orthopterologists Arne and Gerlind Lehmann, who collected the only known specimen.

Figures

Figures 1 - 4. Habitus of the male of Morgenia hamuligera (1), M. rubricornis (2), M. plurimaculata sp. n. (3) and M. lehmannorum sp. n. (4) (left side for the first three species, right side for the fourth species).

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.

Figures 19 - 22. Stridulatory file of the left tegmen in the male of Morgenia rubricornis (19), M. hamuligera (20), M. plurimaculata sp. n. (21) and M. lehmannorum sp. n. (22).

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 39 - 44. Cerci and subgenital plate of male of Morgenia lehmannorum sp. n. (39 lateral, 40 ventral), M. plurimaculata sp. n. (41 lateral, 42 ventral) and M. spathulifera (43 lateral, 44 ventral).

Figures 54 - 56. Living specimens of Morgenia hamuligera from Central African Republic, Dzanga-Ndoki National Park (54; photo by P. Annoyer), M. plurimaculata sp. n. from Central African Republic, Dzanga-Ndoki National Park (55; photo by S. Danflous) and M. lehmannorum sp. n. from Uganda, Semliki Forest National Park (56; photo by K-G Heller).

Figures 35 - 38. Cerci and subgenital plate of male of Morgenia rubricornis (35 lateral, 36 ventral) and M. hamuligera (37 lateral, 38 ventral).

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 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 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).