Brevistoma Tjeder, 1967

Zheng, Yuchen, Ni, Ziyang, Aspöck, Ulrike, Aspöck, Horst, Badano, Davide, Nel, André & Liu, Xingyue, 2025, A hidden treasure along Silk Roads: An unexpected new species of spoon-winged lacewings from Xinjiang, China, and a revision of the genus Brevistoma Tjeder, 1967 (Neuroptera: Nemopteridae), Zootaxa 5566 (1), pp. 97-118 : 98-99

Genus Brevistoma Tjeder, 1967

Brevistoma Tjeder, 1967: 369 . Type species: Savigniella bourboni Navás, 1931 , by original designation.

Diagnosis. Head hairless, showing some sexual dimorphism. Compound eyes larger in male than in female; diameter of eye slightly wider than half of frontal width in male, but relatively shorter in female. Male flagellum generally stout, wider than female, each flagellomere wider than long; female flagellum generally slender, each flagellomere longer than wide (flagellomeres of both male and female longer than wide in B. hackeri ). Male frons shorter than female. Clypeus as long as labrum. Forewing RP originated after midpoint of RA; subcostal area pale yellow. Rather few distal branches of forewing RA. Distal part of hind wing with a weak dilation. Male sternum 9 nearly twice as long as ectoproct, rectangular in ventral view. Male gonocoxites 11 concaved in cephalic view, gonostyli 11 swollen, as a pair of wide lingulate processes.

Distribution. Algeria, China (new record), Libya, Mauritania, Morocco, Niger, Oman, Sudan, United Arab Emirates, Tunisia, Yemen ( Oswald 2024).

Remarks. Brevistoma is closely related to Halter Rambur, 1842 , as they both have concave male gonocoxites 11 (gx11; as in Fig. 5F ), and paired, distinctly swollen, ligulated male gonostyli 11 (gst11). Moreover, both genera are distributed in deserts of the Afrotropical and western Palaearctic regions ( Zheng & Liu 2024). However, the male eye of Brevistoma is smaller than that of Halter , with diameter shorter than width of frons; and the distal part of hind wing of Brevistoma is weakly dilated, while in Halter , the dilation on the distal hind wing is distinctly ovoid.

Figures

FIGURE 5. Brevistoma bourboni (Navás, 1931) stat. rev., male, lectotype. A: Part of habitus. B: Distal hind wing, male. C: Head and thorax, lateral view. D: head and thorax, dorsal view. E: head, frontal view, male. F: Male terminalia, lateral view.