Heterocoelia punctulata ( Xu, He & Terayama, 2003 ) 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 : 11-14

Heterocoelia punctulata ( Xu, He & Terayama, 2003) comb. nov.

Fig. 4

Sulcomesitius punctulata Xu, He & Terayama, 2003: 323 , 326–328.

Material examined

Holotype

CHINA – Fujian • ♀; Zhangzhou; Apr. 1987; Naiquan Lin leg.; ZJUH 984787 .

Other material (4 ♀♀)

CHINA – Fujian • 1 ♀; Fuzhou, Jinshan ; Apr. 1987; Naiquan Lin leg.; ZJUH 202300001 • 1 ♀; Shouning ; 14 Jul. 1987; Changming Liu leg.; ZJUH 9611394 • 1 ♀; Fuzhou ; 13 Aug. 1989; Changming Liu leg.; ZJUH 966313 • 1 ♀; Fuzhou ; 14 Aug. 1990; Changming Liu leg.; ZJUH 966320 .

Re-description

Female

MEASUREMENTS (n = 5). Body length 5.42–6.88 mm; fore wing length 2.85–3.20 mm; LH 1.06–1.08 × WH; WF 1.42–1.57× LE; LE 1.35–1.43× DEV; POL 1.22–1.34× AOL; OOL 0.90–1.04× WOT; median length of pronotum 0.48–0.53 × its width along posterior margin; median length of dorsal surface of MPC 0.71–0.83 × its half-width; length of PPP 0.68–0.72× median length of dorsal surface of MPC.

COLOURATION. Black. Mandible brown; maxillary and labial palpi brown, lighter ventrally. Antenna black; scape, pedicel and flagellomeres I–II brown. Legs brown, procoxa partly dark brown. Fore wing hyaline, brown with longitudinal colourless band medially; veins yellowish brown to brown, pterostigma yellowish brown. Posterior margin of T 1–2 and S2–3, apical half of T 3 and metasomal segments 4–7 yellowish brown.

PUBESCENCE. Body with short, dense light yellowish-brown setae. Antenna with dense appressed setae, sparser on scape ( Fig. 4C ). Eye with sparse erect setae, 3.0× diameter of an ommatidium. Wings with short, dense brown setae. Setae of metasoma longer than setae on head and mesosoma; T 1 with setae laterally, T 2 with basal glabrous triangular area dorsally.

HEAD. Longer than wide, LH 1.06 × WH. Mandible with four apical teeth, ventralmost one longest. Clypeus trilobite; medio-clypeal lobe with anterior margin slightly acute medially ( Fig. 4B ); medio-clypeal carina present, not extending into frons, arched in lateral view. Antenna thickened, ratio between length and width of flagellomeres IV–VII are 0.87, 0.71, 0.78 and 0.95 respectively; pedicel shorter than flagellomere I, length of pedicel 0.74 × length of flagellomere I. Frons coriaceous and densely foveolate; WF 1.57 × LE ( Fig. 4B ). Contour of eye protruding in antero-dorsal view ( Fig. 4B ); LE 0.36 × LH; LE 1.35 × DEV. Anterior ocellus crossing imaginary top line of eyes in antero-dorsal view; POL 1.23 × AOL, OOL 1.04 × WOT, DPV 2.73 × DAO. Vertex coriaceous and densely foveolate; sides of head behind eyes rounded, vertex crest protruding; occipital carina complete. Gena coriaceous and densely foveolate; medioccipito-genal suture and hypostomal sulcus present.

MESOSOMA. Dorsal pronotal area coriaceous and densely foveolate, median length 0.53 × width along posterior pronotal margin ( Fig. 4D ); anterolateral corner weakly angled; median pronotal sulcus foveolate; lateral pronotal area obliquely striate; cervical pronotal area coarse. Mesoscutum distinctly elevated on apical two-thirds, coriaceous with dense punctures; median mesonotal sulcus absent, only impressed on apical half ( Fig. 4E ); notauli complete and converging posteriorly; parapsidal signum shallow, absent near anterior margin. Mesoscutellum coriaceous with dense punctures; mesoscutum-mesoscutellar sulcus present, laterally dilated ( Fig. 4E ); medio-longitudinal sulcus absent. Dorsal surface of MPC elevated; median length of dorsal surface of MPC 0.78 × its half-width; metapostnotum strongly areolate, metapostnotal median carina complete ( Fig. 4E ); metapostnotal-propodeal carina distinctly oblique anteriorly and converging posteriorly; dorsal propodeal area transversely striate; paraspiracular and lateral marginal carinae of MPC complete, lateral marginal carina nearly straight; PPP long, 0.69 × median length of dorsal surface of MPC, not bent upward in dorsal view; transverse posterior carina of MPC complete; propodeal declivity areolate, median and lateral carinae complete; anterior metapleural area transversely striate; 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; postepicnemial sulcus weak.

WINGS. Fore wing with 2r-rs&Rs 2 v slightly curved apically; posterior margin of pterostigma straight, prestigma absent ( Fig. 4G ); Cu 2 v nebulous. Hind wing with three distal hamuli, distance between 1 st and 2 nd hamuli longer than distance between 2 nd and 3 rd hamuli.

METASOMA. Metasomal terga shiny with punctures; T 1 with sparse punctures, medio-longitudinal sulcus present at basal one-third; T 2 with dense punctures, coriaceous basally ( Fig. 4F ); T 3–4 basal half coriaceous. Metasomal sterna shiny with variably sized punctures; S1 irregularly striate.

Male

Unknown.

Distribution

China (Fujian) ( Fig. 20 ).

Remarks

The examination of the holotype of S. punctulata Xu, He & Terayama, 2003 as well as other specimens showed that the mesoscutum is only impressed near the posterior margin rather than having a median mesonotal sulcus, and the antenna is sometimes remarkably thickened medially, which are the main diagnostic features of female Sulcomesitius . Females of Heterocoelia , however, have at most the mesoscutum shallowly and broadly impressed ( Móczár 1984), the antenna slightly thickened and the pronotal median sulcus weak. Therefore, we transfer S. punctulata from the genus Sulcomesitius to the genus Heterocoelia .

Figures

Fig. 4. Heterocoelia punctulata (Xu, He & Terayama, 2003), holotype, ♀ (ZJUH 984787). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum and MPC, dorsal view. F. T2, dorsal view. G. Fore wing. Scale bars: A, C–G = 0.20 mm; B = 0.15 mm.

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