Psychomyia tahmanica, Tao & Qiu, 2024

Tao, Zhulin & Qiu, Shuang, 2024, A new species of Psychomyia (Trichoptera, Psychomyiidae) from China, Zootaxa 5471 (5), pp. 594-600 : 596-598

Psychomyia tahmanica sp. nov.

Type material. Holotype ♂: CHINA, Xinjiang, Tahman wetland (37.93ºN, 75.18ºE), Tahman township , Tashkurgan Tajik Autonomous County, 3020 m, 22.vii.2022, leg. ZL Tao. Paratypes: 1♂ 6♀, same data as holotype .

Diagnosis. This new species is similar to Psychomyia mangshanensis Peng & Sun 2024 (in Peng et al. 2024) in male genitalia, but it can be distinguished by the subtrapezoidal sternum IX, the basal processes of the superior appendages absent, and the inferior appendages each with a digitate process in middle; in P. mangshanensis , sternum IX is subrectangular, superior appendages have basal processes, and inferior appendages are without digitate processes ( Peng et al. 2024: fig. 2).

Description. Adult ( Fig. 3 ). Length of each forewing 4.0– 4.5 mm (n = 8). Forewings light brown, forks II – V present; hind wings with forks II and V present ( Figs 4A , 5A ).

Male genitalia ( Figs 4B–4D , 5B–5E ). Sternum IX subtrapezoidal in ventral view, its posterior margin with middle portion deeply concave. Tergum IX weakly sclerotized. Superior appendages well developed, each divided apically into one dorsomesal branch and one ventrolateral branch: dorsomesal branch sclerotized, elliptical, curved mesad, about 2/5 length of ventrolateral branch; ventrolateral branch setose, basal half trapezoid in lateral view, distal half nearly as thick, apically curved laterad. Inferior appendages each with basal half nearly as thick as apex, gradually tapering to pointed apex, with thick spine apically; recurved posteroventrad distally, with digitate process in middle. Phallobase subrectangular; phallicata slender, its main portion sinuate, hooked apically, its basoventral process lamellate, teardrop-shaped in lateral view.

Female genitalia ( Figs 6 ). Female genitalia involve segment VIII–XI. Segment VIII rectangular. Segment IX reduced, inconspicuous. Segment X sternum twice as long as tergum, sternum with median ventral cleft (anovaginal opening). Segment XI short, rounded apically, with pair of cerci.Apophyses anteriores about 1/3 length of apophyses posteriores. Vaginal apparatus sclerotized in ventral view, membranous in dorsal view. Vulval scale subrectangular in lateral view.

Distribution. China (Xinjiang).

Etymology. The specific epithet is derived from the type locality of the species (Tahman).

Ecology. The water source of Tahman originates from the western slope of Muztagata Mountain, and its main tributaries are Kaila and Beldarsh streams, and spring water is also its supply water source. The river in Tahman valley is more than 50 kilometers long, flowing southeast to Tashkurgan River, with an average elevation of more than 3500 m. Many peaks in the region are covered with snow all the time. The climate type is continental alpine climate, the climate vertical differentiation is significant. The temperature rises quickly in spring and the winter is long and cold. Rain and snow are rare, and rainfall is mainly concentrated in spring and summer. The average temperature from 1970 to 2000 was 4.3℃, the highest average monthly temperature was 17.2℃, and the lowest monthly average temperature was -10.2℃. The average annual precipitation was 57 mm, mainly from July to September ( Wan 2022).

Figures

FIGURE 3. Adult female of Psychomyia tahmanica sp. nov. (scale bar = 2 mm)

FIGURE 4. Photographs of Psychomyia tahmanica sp. nov. paratype. 4A, venation of left fore- and hind wings, dorsal; 4B–4E, Male genitalia: 4B, 4C, lateral; 4D, dorsal; 4E, ventral. (scale bars: 4A = 1 mm, 4B–4E = 250 um).

FIGURE 5. Photographs of Psychomyia tahmanica sp. nov. 5A, venation of left fore- and hind wings, dorsal; 5B–5D, male genitalia: 5B, 5C, ventral; 5D, dorsal. (scale bars: 5A = 1 mm, 5B–5D = 0.2 mm). 5B is based on the holotype.

FIGURE 6. Female genitalia of Psychomyia tahmanica sp. nov. (scale bars: 6A–6B = 250 um, 6C = 100 um).