Ichthyurus senensomimus Y. Yang, Lin & X. Yang, 2025

Ichthyurus senensomimus Y. Yang, Lin & X. Yang sp. nov.

Figs 6 H ‒ I View Figure 6 , 8 I View Figure 8 , 10 F View Figure 10 , 20 C ‒ D View Figure 20 , 22 E ‒ H View Figure 22 , 23 View Figure 23

Type material.

Holotype. China. Yunnan • ♂ ( IZAS), Yongsheng, Liude , 2240 m alt., 18. VII. 1984, Shuyong Wang leg.

Paratypes. China. Yunnan • 1 ♂ 1 ♀ ( IZAS), same locality as holotype, 2230 m alt., 8. VII. 1984, Jianguo Fan leg.

Differential diagnosis.

This species could be distinguished from all others of Ichthyurus by combination of the following characters: body colouration (Fig. 20 C, D View Figure 20 ), moderately swollen profemora in male (Fig. 6 H View Figure 6 ), shape of terminal abdominal ventrite of male (Fig. 23 C View Figure 23 ) and female (Fig. 23 D View Figure 23 ), as well as aedeagus (Fig. 22 E ‒ H View Figure 22 ).

This species looks similar to I. senensis in the body coloration (Fig. 20 C, D View Figure 20 vs. Fig. 1 A, B View Figure 1 ), but differs in the shapes of terminal abdominal ventrite of male (Fig. 2 E View Figure 2 vs. Fig. 23 C View Figure 23 ) and female (Fig. 2 F View Figure 2 vs. Fig. 23 D View Figure 23 ), as well as aedeagus (Fig. 3 A ‒ D View Figure 3 vs. Fig. 22 E ‒ H View Figure 22 ). Additionally, it resembles I. longulus Y. Yang, Lin & Liu, 2024 in the general shapes of terminal abdominal ventrites of both male (Fig. 23 C View Figure 23 vs. Lin et al. (2024 b): fig. 2 D) and female (Fig. 23 D View Figure 23 vs. Lin et al. (2024 b): fig. 2 F), but it can be distinguished from the latter in the bicoloured elytra, mixed black with yellow (Fig. 20 C, D View Figure 20 ) (elytra uniformly black in I. longulus ; Lin et al. (2024 b): fig. 1); profemora moderately swollen in male (Fig. 20 C View Figure 20 ) (slender in I. longulus ; Lin et al. (2024 b): fig. 1); terminal abdominal ventrites of both sexes with stouter and shorter postero-lateral projections (Fig. 21 A, B View Figure 21 ) (very slender and long in I. longulus ; Lin et al. (2024 b): fig. 2 A ‒ C); aedeagus: setifore extension reduced and invisible (Fig. 22 F View Figure 22 ) (well-developed and as long as parameres in I. longulus ; Lin et al. (2024 b): fig. 3).

Description.

Body length (both sexes): 7.3‒7.7 mm ( 7.3 mm in holotype); body width (both sexes): 1.5 mm ( 1.5 mm in holotype).

Male (Fig. 20 C View Figure 20 ). Colouration. Body black, head yellow before antennal sockets, antennomeres I ‒ III yellow, prosternum yellow, pronotum yellow with a large black marking extending to all margins, except for yellow at posterior angles and middle semicircular regions near to posterior margin, scutellum yellow, elytra yellow along suture, the yellow stripe wider near apices, abdomen yellow posteriorly and laterally.

Eyes strongly protruding, interocular distance ca. 0.6 times of the diameter of an eye. Antennae extending to elytral apex, antennomere II ca. 1 / 3 length of I, III ‒ XI subequal in length and ca. 1.5 times longer than II.

Pronotum 1.3 times wider than long, anterior margin arcuate, lateraly margins arcuate, posterior margin slightly bisinuate, anterior angles feebly emarginate, posterior angles nearly rectangular.

Elytra 1.4 times longer than wide, approximately twice longer than pronotum, with lateral margins slightly sinuate, sutural margins sinuate and moderately dehiscent from the base, distance between sutural margins twice as wide as apical width of an elytron, apices rounded.

Profemora (Fig. 6 H View Figure 6 ) strongly swollen, fluent ventrally, without any tooth, 2.4 times longer than wide; mesotrochanter (Fig. 6 I View Figure 6 ) with an acute apical tooth, mesofemora (Fig. 6 I View Figure 6 ) moderately swollen, fluent ventrally, without any tooth; metathoracic legs slender and simple (Fig. 20 C View Figure 20 ).

Terminal abdominal tergite (Fig. 23 A View Figure 23 ) ca. 1.5 times longer than wide, with postero-lateral projections ca. 1 / 3 length of the tergite, nearly straight at inner margins, moderately arcuate at outer margins. Proctiger (Fig. 23 A View Figure 23 ) bilobed and laterally sclerotised, semi-surrounded by paraproct; paraproct (Fig. 23 A View Figure 23 ) strongly developed and tubular, feebly shrunk apically, rounded at dorso-posterior margin, tergal flange (destroyed and missing).

Terminal abdominal ventrite (Fig. 23 C View Figure 23 ) trilobed, ca. 1.4 times as long as wide, fissured in middle of apical 4 / 5 part, with lateral lobes diverging posteriorly and rectangularly protuberant in middle of inner margins, the protuberances very acute at apices, arcuate at outer margins, rectangular at inner apical angles, narrowly rounded and feebly projecting at outer apical angles, truncate at posterior margins.

Abdominal sternite IX (Fig. 8 I View Figure 8 ) moderately sclerotised and narrowed posteriorly, ca. 2.4 times longer than wide, with posterior margin obliquely truncate and confluent with posterior left angle, posterior right angle rectangular, anterior left angle stout beak-shaped and right angle strongly protruding anteriorly, moderately expanded and triangular at apex.

Aedeagus (Fig. 22 E ‒ H View Figure 22 ): right paramere stout, abruptly stepped near apical 1 / 4 part of outer side, acute at apex (Fig. 22 E ‒ H View Figure 22 ); left paramere bent near base and horn-shaped, acute at apex, nearly as long as right paramere (Fig. 22 E, H View Figure 22 ); setifore extension reduced and almost invisible (Fig. 22 F View Figure 22 ); median lobe ca. 1.5 times as long as tegmen, progressively narrowed basally (Fig. 22 E, H View Figure 22 ).

Female (Fig. 20 D View Figure 20 ). Similar to males, but body larger and longer, eyes less protruding, pro- and meso-thoracic legs slender and simple, antennomeres I ‒ III black, pronotum with black marking not extending to anterior margin and anterior angles; terminal abdominal tergite (Fig. 23 B View Figure 23 ) ca. 1.1 times longer than wide, with postero-lateral projections ca. 1 / 3 length of the tergite; terminal abdominal ventrite (Fig. 23 D View Figure 23 ) ca. 1.1 times as long as wide, widest near middle, rounded at lateral margins and confluent with outer apical angles, with a pair of small and triangular protuberances on both sides of posterior margin. Internal organ of the reproductive system (Fig. 10 F View Figure 10 ): bursa copulatrix elongate tube-shaped at apex; accessory gland expanded at apical half part.

Etymology.

The specific name is derived from the Latin word - mimus (imitate), refers to its similarity to senensis.

Distribution.

China ( Yunnan).