Ishiharella trifurcata, Wang & Zhang & Cao, 2025

Ishiharella trifurcata sp. nov.

( Figs 1–4 View FIGURES 1–8. 1, 2, 3, 4 , 9–10, 12–15 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 17–28 View FIGURES 17–28 )

Type material: Holotype. ♂ ( NWAFU), China, Guangxi, Hechi, Huanjiang Maonan Autonomous County, 23-VI-2022, Ran Wang . Paratypes. 13 ♂♂ ( NWAFU), same data as holotype .

Description. Length: male 4.0–4.3 mm.

General color red brown. Area between eyes with two pigmented depressions and yellowish patches, posterior margin with median brownish patch. Eyes black. Ocelli white. Face whitish yellow, anteclypeus with apex black. Pronotum dark centrally, with black sinuate transverse depression on each side. Scutellum yellow, apex black, scutoscutellar sulcus black brownish. Abdomen slightly brown infuscated in midline dorsally. Forewing brown, hind wing hyaline. Legs sordid except claws black ( Figs 1–4 View FIGURES 1–8. 1, 2, 3, 4 ).

Male 2S abdominal apodemes reaching basal of segment IV, basal apodemes broad, apically narrowed ( Figs 13, 15 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 ). Male pygofer brown, strongly narrowed in apical half, with filamentous setae on outer face near dorsal margin, apex pointed and curved upward, caudoventral protrusion of pygofer short, in lateral view not surpassing the end of pygofer side, in dorsal aspect skeletonized and incised subbasally ( Figs 9, 12, 14 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 17, 19 View FIGURES 17–28 ). Subgenital plate surpassing pygofer lobe, separated in basal 1/3, slightly expanded basally, apex rounded; ca. 24 macrosetae uniseriate in most part; arising near basal 1/4 of plate with 6–7 feeble macrosetae in alignment, reaching apex ( Figs 9, 12, 14 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 17–18 View FIGURES 17–28 ). Aedeagal shaft slim and long, with even width from base to apex, gonopore vterminal; dorsoatrium shorter than shaft, near the apex of the dorsally protrusion bifurcated, spread out to the sides extended, with a slightly curved apex; basoventral protrusion of aedeagus much longer and wider than shaft, broadened basally and tapering to apex in lateral view, basally with a broad cavity which is connected with the connective basoventrally ( Figs 9, 10, 12, 14 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 20, 21 View FIGURES 17–28 ). Connective lamellate caudally and crimped basally, caudal margin concave medially ( Figs 9 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 26 View FIGURES 17–28 ). Paramere almost the same length with pygofer, subbasally adorned with 3–4 teeth laterally, bifurcated at nearly apex and bearing a lamellar process basad of bifurcation ( Figs 9 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 27 View FIGURES 17–28 ). Anal tube appendage developed, skeletonized, curved toward apex ( Figs 9 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 28 View FIGURES 17–28 ).

Notes. This new species is similar to I. paradentata Lu & Qin , but differs in male genitalia (features of I. paradentata in parentheses): dorsoatrium of aedeagus skeletonized with bifurcates and curved apically (dorsoatrium slightly radian, skeletonized basally and membranous apically) ( Figs 20–21 View FIGURES 17–28 ); aedeagal shaft glabrate, without small teeth (aedeagal shaft with 4–5 small teeth apically) ( Figs 20–21 View FIGURES 17–28 ); caudoventral protrusion of pygofer short and not surpassing the end of pygofer side, curved dorsad and without teeth (caudoventral protrusion of pygofer significantly surpassing the end of pygofer side, ventrally bearing a tooth medially) ( Figs 17, 19 View FIGURES 17–28 ).

It is noteworthy that the variation of aedeagal dorsoatrium is evident ( Figs 20–25 View FIGURES 17–28 ) although the other structures of male genitalia are nearly identical among samples. The aedeagal dorsoatrium of one paratype bifurcates at the base with a dorsally protruding curved apex turning left in dorsal view ( Figs 22–23 View FIGURES 17–28 ). In another paratype, although dorsoatrium bifurcates near the apex, apicad of which is strongly curved ( Figs 10, 14 View FIGURES 9–16. 9, 10, 12, 13, 14, 15 , 24–25 View FIGURES 17–28 ).

Etymology. The name is derived from the Latin word “ trifurcatus ” (branch), referring to the trifurcate aedeagal processes of the type specimens.

Distribution. China (Guangxi).