Dayus motuoensis Ding, Yu & Yang, 2024

Dayus motuoensis Ding, Yu & Yang sp. nov.

( Figs 37–51 View FIGURES 37–42 View FIGURES 43–51 )

Description: Length. Male 3.5 mm.

Whole body red ( Figs 37–40 View FIGURES 37–42 ). Eyes grayish-black ( Figs 37–40 View FIGURES 37–42 ). Coronal suture reddish brown ( Figs 37, 40 View FIGURES 37–42 ). Legs red to light orange-red ( Figs 38, 39, 40 View FIGURES 37–42 ). Forewing with veins red to reddish-brown ( Figs 37, 38, 41 View FIGURES 37–42 ).

Head including eyes slightly wider than pronotum in dorsal view, coronal suture not reaching midlength of crown ( Figs 37, 40 View FIGURES 37–42 ). Face narrow and slender, convex in lateral view ( Figs 38, 39 View FIGURES 37–42 ). Head anterior margin roundly produced ( Figs 37, 40 View FIGURES 37–42 ). Forewing narrow, with veins RP, MP’ and MP’’+CuA arising from m cell, hindwing with CuA unbranched ( Figs 41, 42 View FIGURES 37–42 ).

Male ventral abdominal apodemes reaching the end of segment 4 and diverging ( Fig. 43 View FIGURES 43–51 ). Male pygofer with 13 rigid macrosetae, ventral dorsal bridge clearly defined, and ventral appendage with slightly sinuate and expanded, tapering to apex ( Figs 44, 45, 46 View FIGURES 43–51 ). Subgenital plate extends beyond pygofer side, with 4 A- group setae, 12 B-group spiny setae, 15 C- group setae, and 2–3 rows D-group setae ( Figs 44, 45, 47 View FIGURES 43–51 ). Paramere slim and curved, with tiny teeth and 5–6 fine setae subapically ( Fig. 48 View FIGURES 43–51 ). Connective fully united with the base of aedeagus ( Figs 49, 50 View FIGURES 43–51 ). Aedeagus shaft with apical process and midlength with bifurcate processes extended to different directions on each side ( Figs 49, 50 View FIGURES 43–51 ). Anal tube processes broad, curved, and tapering apically ( Fig. 51 View FIGURES 43–51 ).

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Material examined. Holotype ♂, Dexing , Motuo, Xizang, China, 95.3078° E, 29.3262° N, 827.4 m, 29 June 2022, coll. Yan Ding. GoogleMaps Paratypes: 1♂, Damuluo , Motuo, Xizang, China, 95.4641° E, 29.4937° N, 1569.48 m, 3 July 2023, coll. Yan Ding GoogleMaps ; 1♂ Jingdong , Puer, Yunnan, China, 22 July 2022 , coll. Hong-Li He.

Etymology. The name of the new species is derived from the collecting location of type species (Motuo, Xizang, China).

Remarks. This species is similar to Dayus lii Qin & Zhang, 2007 mainly in body colour and the shape of the aedeagus. Both species have a pair of bifurcated lateral aedeagus processes ( Figs 49, 50 View FIGURES 43–51 ), but the new species differs from the latter in having the ventral pygofer appendage unbranched apically ( Fig. 46 View FIGURES 43–51 ), and the aedeagus processes located at the midlength of the shaft and oriented laterad ( Figs 49, 50 View FIGURES 43–51 ). In contrast, Dayus lii has the aedeagus processes arising subapically.

Distribution. China ( Xizang, Yunnan).