Heterocoelia unicolor, 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 : 17-19

Heterocoelia unicolor sp. nov.

urn:lsid:zoobank.org:act:8F078314-F9E1-4FAC-8E57-6FA509C0869A

Fig. 6

Diagnosis

This new species can be recognized from other species of this genus by having the foveae on the dorsal pronotal area sparser and shallower than those on the head, the length of the PPP slightly longer than its width at the base, the anterior margin of the PPP rounded in lateral view, the legs reddish brown and the hind wing with three distal hamuli.

Etymology

The specific epithet ‘ unicolor ’ is a combination of the Latin words ‘ uni- ’ and ‘ color ’ which refers to the unicoloured reddish-brown legs of this species.

Material examined

Holotype

CHINA – Yunnan • ♀; Naban River Watershed National Nature Reserve , Mandian ; 26 Apr. 2009; Lingzeng Meng leg.; IZCAS IOZ(E) 2059143.

Description

Female

MEASUREMENTS. Body length 6.80 mm. Fore wing length 2.78 mm.

COLOURATION. Black. Mandible light brown, teeth brown; maxillary and labial palpi brown, lighter ventrally. Antenna black; scape light brown, pedicel and flagellomere I brown. Fore wing hyaline, brown with longitudinal colourless band medially; veins dark brown, pterostigma yellowish brown. Legs light brown. T4–7 brown or light brown.

PUBESCENCE. Body with short, dense light yellowish-brown setae. Antenna with dense appressed setae, sparser on scape. Eye with sparse erect setae, 3.0× diameter of an ommatidium. Wings with short dense brown setae. Setae of metasoma longer than setae of head and mesosoma; T1 with setae laterally, T2 with basal glabrous triangular area dorsally.

HEAD. Longer than wide, LH 1.08 × WH. Mandible with four sharp teeth, ventralmost one longest. Clypeus trilobite; medio-clypeal lobe with anterior margin rounded ( Fig. 6B ); medio-clypeal carina present, not extending into frons, arched in lateral view. Antenna thickened, ratio between length and width of flagellomeres II–V 0.92, 0.87, 0.92 and 1.04, respectively; pedicel longer than flagellomere I, length of pedicel 1.06 × length of flagellomere I. Frons coriaceous and densely foveolate; WF 1.39 × LE. Contour of eye protruding in antero-dorsal view ( Fig. 6B ); LE 0.39 × LH; LE 1.46 × DEV. Anterior ocellus crossing imaginary top line of eyes in antero-dorsal view; POL 1.32 × AOL, OOL 0.84 × WOT, DPV 2.73 × DAO. Vertex coriaceous and densely foveolate; sides of head behind eyes rounded, vertex crest protruding. Occipital carina complete, occiput coriaceous. Gena coriaceous and densely foveolate, shallower foveolate ventrally; medioccipito-genal suture and hypostomal sulcus present.

MESOSOMA. Dorsal pronotal area coriaceous and shallowly foveolate, median length 0.52 × width along posterior pronotal margin; anterolateral corner weakly angled ( Fig. 6B ); median pronotal sulcus foveolate; lateral pronotal area areolate; cervical pronotal area coarse. Mesoscutum distinctly elevated on apical two-thirds, coriaceous with dense punctures; median mesonotal sulcus absent, only impressed in middle of apical half ( Fig. 6E ); notauli complete and converging posteriorly; parapsidal signum shallow, absent near anterior margin. Mesoscutellum coriaceous and foveolate, with punctures intermediately; mesoscutum-mesoscutellar sulcus present, laterally dilated ( Fig. 6E ); medio-longitudinal sulcus absent. Dorsal surface of MPC elevated; median length of dorsal surface of MPC 0.74 × its half-width; metapostnotum strongly areolate, metapostnotal median carina complete ( Fig. 6F ); metapostnotal-propodeal carina complete, distinctly oblique anteriorly and converging posteriorly; dorsal propodeal area transversely striate; paraspiracular and lateral marginal carinae of MPC complete, lateral marginal carinae nearly straight; PPP long, length of PPP 0.45 × median length of dorsal surface of MPC, apical margin of PPP rounded in lateral view ( Fig. 6F ); 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. 6H ); Cu 2 v nebulous. Hind wing with three dorsal hamuli, distance between 1 st and 2 nd distal hamuli 1.54 × distance between 2 nd and 3 rd distal hamuli.

METASOMA. Metasomal terga shiny with punctures; T1 with sparse punctures, medio-longitudinal sulcus present on basal third of T1; T2 with dense punctures, coriaceous basally ( Fig. 6G ); basal half of T3–4 coriaceous. Metasomal sterna shiny with variably sized punctures; S1 irregularly striate.

Male

Unknown.

Distribution

China (Yunnan) ( Fig. 20 ).

Figures

Fig. 6. Heterocoelia unicolor sp. nov., holotype, ♀ (IZCAS IOZ(E) 2059143). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. Scale bars: A, C–H = 0.20 mm; B = 0.25 mm.

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