Incertosulcus exilisulcus, Wang & He & Chen, 2024

Wang, Chunhong, He, Junhua & Chen, Xuexin, 2024, Revision of subfamily Mesitiinae (Hymenoptera, Bethylidae) from China, European Journal of Taxonomy 960 (1), pp. 1-61 : 25-28

Incertosulcus exilisulcus sp. nov.

urn:lsid:zoobank.org:act:233C0A49-2466-44BA-A7B9-433819F1EF0D

Fig. 9

Diagnosis

This new species can be recognized by having the antennal setae longer than the width of the flagellomere; median pronotal sulcus present and not distinctly foveolate; median mesonotal sulcus absent, at most with a fovea or foveolate sulcus near posterior margin; the length of PPP longer than its width at the base; the hypopygium longer than wide, with posterior branches short; the genitalia with the dorsal harpe filamentary and narrower than the ventral harpe.

This species is similar to I. afoveatus sp. nov. by sharing the simple aedeagus (without a sickle-shaped process apically). However, it can be distinguished as follows: the mesoscutellum has a medio-longitudinal suture, the PPP is longer than its width at the base and T2 has denser punctures than in I. afoveatus .

Etymology

The specific epithet ‘ exilisulcus ’ is a combination of the Latin words ‘ exilis ’ (‘weak’) and ‘ sulcus ’ (‘groove’) and refers to the mesoscutellum of this species having a weak medio-longitudinal suture.

Material examined

Holotype

CHINA – Hainan • ♂; Bawangling ; 7–11 Jul. 2006; Liqiong Weng leg.; ZJUH 200700110 .

Paratypes (9 ♂♂)

CHINA – Hainan: 1 ♂; same collection data as holotype; ZJUH 200700135 • 6 ♂♂; Bawangling ; 7–11 Jul. 2006; Jingxian Liu leg.; ZJUH 200700012 , 200700028 , 200700040 , 200700041 , 200700075 , 200700084 • 1 ♂; Jianfengling ; 12–15 Jul. 2006; Tianfei Chen leg.; ZJUH 200700786 . – Yunnan • 1 ♂; Mt. Gaoligong ; 20–21 Jul. 2006; Jie Zeng leg.; ZJUH 200701080 .

Description

Male

MEASUREMENTS (n = 10). Body length 2.85–4.01 mm; fore wing length 1.81–2.49 mm; LH 0.95–1.03 × WH; WF 1.75–1.91× LE; LE 0.95–1.11 × DEV; POL 1.44–1.68 × AOL; OOL 0.86–0.99× WOT; DPV 1.65–2.3× DAO; median length of pronotum 0.42–0.48× its width along posterior margin; length of MPC 0.93–1.12× its half-width; length of PPP 0.19–0.27 × median length of dorsal surface of MPC; length of hypopygium 1.28–1.51× its width; length of hypopygial posterior branches 0.21–0.26× length of hypopygium.

COLOURATION.Black. Mandible brown, teeth yellowish brown; maxillary and labial palpi brown.Antenna yellowish brown, scape brown. Legs brown, trochanters, tibiae apically, and tarsi yellowish brown. Prothorax and mesothorax dark brown. Fore wing hyaline, light brown with longitudinal colourless band medially; veins and pterostigma pale light brown. Metasoma mainly brown, partly dark brown.

PUBESCENCE. Body with short setae. Antenna with erect setae, nearly equal to width of flagellomere ( Fig. 9C ). Eye with short setae, nearly 4.0 × diameter of an ommatidium. Wings with short dense brown setae. T1 nearly glabrous, T2 with sparse setae laterally.

HEAD. Slightly shorter than wide, LH 0.95 × WH. Mandible with three apical teeth, ventral larger than upper two. Clypeus trilobite; medio-clypeal lobe with anterior margin acute medially; medio-clypeal carina present, not extending into frons, arched in lateral view. Antenna thin, flagellomeres cylindrical. Frons coriaceous and densely foveolate, frontal line weak ( Fig. 9B ); WF 1.79 × LE. Eye small, LE 0.35 × LH; contour of eye distinctly protruding in antero-dorsal view; LE 1.06 × DEV. Anterior ocellus partly anterior to imaginary top line of eyes in antero-dorsal view ( Fig. 9B ); POL 1.60× AOL, OOL 0.98 × WOT, DPV 2.23× DAO. Vertex coriaceous and densely foveolate, sides of head behind eyes distinctly converging posteriorly, vertex crest nearly straight. Gena coriaceous and densely foveolate, ventral surface with fovea shallower and sparser, medioccipito-genal suture present. Occipital carina present.

MESOSOMA. Dorsal pronotal area coriaceous and densely foveolate, median length 0.33 × width along posterior pronotal margin; anterolateral corner rounded; median pronotal sulcus nearly complete ( Fig. 9D ); lateral pronotal area obliquely striate; cervical pronotal area coarse. Mesoscutum elevated, coriaceous and shallowly foveolate; median mesonotal sulcus absent; notauli complete and converging posteriorly; parapsidal signum shallow and absent near anterior margin; lateral area of mesoscutum depressed anteriorly ( Fig. 9D ). Mesoscutellum coriaceous, distinctly foveolate; mesoscutum-mesoscutellar sulcus present, laterally dilated; medio-longitudinal suture present ( Fig. 9D ). Dorsal surface of MPC elevated; median length of dorsal surface of MPC equal to its half-width; metapostnotum strongly areolate, metapostnotal median carina complete; metapostnotal-propodeal carina complete, distinctly oblique anteriorly and converging posteriorly; dorsal propodeal area striate; paraspiracular and lateral marginal carinae of MPC complete, lateral marginal carina nearly straight; PPP present, 0.27 × median length of dorsal surface of MPC, apex acute and not bent upward in lateral view ( Fig. 9E ); transverse posterior carina of MPC complete; propodeal declivity weakly striate, areolate near transverse posterior carina, median and lateral carinae complete; lateral surface of MPC irregularly striate, areolate near submarginal carina of MPC. Propleuron coriaceous. Mesopleuron coriaceous, densely foveolate; subalar impression present; posterior oblique sulcus of mesopleuron present and foveolate; ventral surface without fovea, with short carina near mesocoxa; anterior mesofurcal pit and mesodiscrimen present.

WINGS. Fore wing with 2r-rs&Rs 2 v slightly curved apically; posterior margin of pterostigma straight, prestigma absent; Cu 2 v absent. Hind wing with three distal hamuli.

METASOMA. Metasomal terga shiny with punctures; T1 with sparse punctures, medio-longitudinal sulcus present at basal one-third; T2 with punctures, coriaceous basally ( Fig. 9F ). Metasomal sterna shiny with variably sized punctures; S1 irregularly striate. Length of hypopygium 1.28 × width; anterior stalk narrowed with anterior margin straight ( Fig. 9H ); posterior margin bilobate, posterior branches broad and short with long setae, 0.23× length of hypopygium.

MALE GENITALIA. Harpe bilobate, dorsal harpe filamentary and straight ( Fig. 9I ); ventral harpe distinctly broader than dorsal harpe ( Fig. 9J ), with long setae apically. Cuspis bilobate with long setae; digitus bent and papillate apically, with setae basally; aedeagus bottle-shaped, apical margin acute medially ( Fig. 9I ).

Female

Unknown.

Distribution

China (Hainan, Yunnan) ( Fig. 20 ).

Figures

Fig. 9. Incertosulcus exilisulcus sp. nov., holotype, ♂ (ZJUH 200700110). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum and mesonotum, dorsal view. E. MPC, dorsal view. F. T2, dorsal view. G. Fore wing. H. Hypopygium. I. Genitalia, dorsal view. J. Genitalia, ventral view. Scale bars: 0.20 mm.

Fig. 20. Distribution map of species of Mestiinae from China.