Incertosulcus afoveatus, 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 : 22-25

Incertosulcus afoveatus sp. nov.

urn:lsid:zoobank.org:act:7E226425-0DEA-43DE-A965-1663A167B2B1

Fig. 8

Diagnosis

This new species can be recognized by having the antennal setae longer than the width of the flagellomeres; median pronotal sulcus present and foveolate; median mesonotal sulcus absent, at most with a long fovea near the posterior margin; PPP short, basal width nearly equal to its length; the hypopygium longer than wide, with the posterior branches short ( Fig. 8G ); genitalia with dorsal harpe filamentary, and narrower than ventral harpe.

This species is similar to I. exilisulcus sp. nov. by sharing the simple aedeagus without a sickle-shaped process apically. However, I. afoveatus sp. nov. can be distinguished by having the mesoscutum and mesoscutellum not foveolate (more or less foveolate in I. exilisulcus ); the mesoscutellum without a medio-longitudinal suture (present in I. exilisulcus ); the basal width of PPP nearly equal to its length (two-thirds of length in I. exilisulcus ); T2 with sparse punctures (denser in I. exilisulcus ).

Etymology

The specific epithet ‘ afoveatus ’ is a combination of the Latin words ‘ a ’ (for ‘without’) and ‘ foveatus ’ and refers to the absence of foveae on the mesoscutum and mesoscutellum.

Material examined

Holotype

CHINA – Fujian • ♂; Minqing, Xiongjiang Town; 13–17 Jul. 2005; Zaifu Xu leg.; ZJUH 200609178 .

Paratype (1 ♂)

CHINA – Hainan • 1 ♂; Bawangling ; 7–11 Jul. 2006; Liqiong Weng leg.; ZJUH 200700151 .

Description

Male

MEASUREMENTS (n = 2). WF 1.78–1.83 × LE; LE 0.99–1.05 × DEV; POL 1.27–1.55 × AOL; OOL 0.87– 0.92 × WOT; DPV 1.51–1.56 × DAO; length of hypopygium 1.41–1.53 × its width; length of posterior branches of hypopygium 0.18–0.19× length of hypopygium.

COLOURATION. Black, metasoma mainly brown, T3 yellowish brown. Mandible yellowish brown; maxillary and labial palpi brown. Antenna brown, scape dark brown. Legs brown, trochanters, femora apically, tibiae apically, and tarsi yellowish brown. Fore wing hyaline; veins and pterostigma pale yellowish brown.

PUBESCENCE.Body with short sparse setae.Antenna with erect setae, nearly equal to width of flagellomere ( Fig. 8B ). Eye with sparse short setae, nearly 3.0× diameter of an ommatidium. Wings with short, dense brown setae. T1 nearly glabrous; T2 with sparse setae laterally.

HEAD. Slightly shorter than wide, LH 0.98 × WH. Mandible with three apical teeth, ventralmost one largest. Clypeus trilobite; medio-clypeal lobe with apical 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. 8A ); WF 1.83 × LE. Eye small, LE 0.35 × LH; contour of eye distinctly protruding in antero-dorsal view ( Fig. 8A ); LE 0.99 × DEV. Anterior ocellus partly anterior to imaginary top line of eyes in antero-dorsal view; POL 1.27 × AOL, OOL 0.87 × WOT, DPV 1.51 × DAO. Vertex coriaceous and densely foveolate, sides of head behind eyes distinctly converging posteriorly ( Fig. 8A ). Occipital carina present, vertex crest nearly straight.

MESOSOMA. Dorsal pronotal area coriaceous and densely foveolate, median length 0.33 × width of posterior pronotal margin, anterolateral corner rounded; median pronotal sulcus foveolate; lateral pronotal area obliquely striate; cervical pronotal area coarse ( Fig. 8C ). Mesoscutum coriaceous and sparsely foveolate; median mesonotal sulcus absent; notauli complete and converging posteriorly ( Fig. 8C ); parapsidal signum shallow and absent near anterior margin; lateral area of mesoscutum depressed anteriorly ( Fig. 8C ). Mesoscutellum weakly coriaceous with shallow punctures; mesoscutum-mesoscutellar sulcus present, laterally dilated ( Fig. 8C ). Dorsal surface of MPC elevated; median length of dorsal surface of MPC equal to its half-width ( Fig. 8D ); metapostnotum strongly areolate, metapostnotal median carina complete, slightly tortuous ( Fig. 8D ); metapostnotal-propodeal carina complete, slightly oblique anteriorly and converging posteriorly; dorsal propodeal area densely striate; paraspiracular carinae of MPC complete; lateral marginal carina of MPC complete and protruding ( Fig. 8D ); PPP short, 0.1× median length of dorsal surface of MPC, apex acute and bent upward in lateral view; transverse posterior carina of MPC complete; propodeal declivity coriaceous, areolate near transverse posterior carina, median and lateral carinae complete; lateral surface of MPC sparsely striate, areolate near submarginal carina of the MPC. Propleuron coriaceous. Mesopleuron coriaceous, densely and shallowly foveolate; subalar impression present; posterior oblique sulcus of mesopleuron present and foveolate.

WINGS. Fore wing with 2r-rs&Rs 2 v slightly curved apically ( Fig. 8F ); posterior margin of pterostigma nearly 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 on anterior third of T1; T2 with sparse punctures, weakly coriaceous basally ( Fig. 8E ). Metasomal sterna shiny with variably sized punctures; S1 coriaceous. Length of hypopygium 1.4× its width; anterior stalk with anterior margin straight ( Fig. 8G ); posterior margin bilobate ( Fig. 8G ), posterior branches broad and short with long setae, 0.2 × length of hypopygium.

MALE GENITALIA. Harpe bilobate, dorsal harpe filamentary and straight ( Fig. 8H ); ventral harpe distinctly broader than dorsal harpe and with long setae apically ( Fig. 8I ). Cuspis bilobate with long setae; digitus bent and papillate apically, with setae basally; aedeagus bottle-shaped with apical margin rounded ( Fig. 8H ).

Female

Unknown.

Distribution

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

Figures

Fig. 8. Incertosulcus afoveatus sp. nov., holotype, ♂ (ZJUH 200609178). A. Head, antero-dorsal view. B. Antenna. C. Pronotum and mesonotum, dorsal view. D. MPC, dorsal view. E. T2, dorsal view. F. Fore wing. G. Hypopygium. H. Genitalia, dorsal view. I. Genitalia, ventral view. Scale bars: 0.20 mm.

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