Astromesitius, a new genus of Mesitiinae (Hymenoptera, Bethylidae) from the Old World Author Barbosa, Diego N. Author Azevedo, Celso O. text European Journal of Taxonomy 2019 2019-12-11 587 1 20 journal article 24108 10.5852/ejt.2019.587 b1bebdfa-3977-46b4-98ae-94d891747bbb 3659973 980C8BF7-A2EB-4D20-B429-CF5C4101B45B Astromesitius olavoi gen. et sp. nov. urn:lsid:zoobank.org:act: 0A21A488-42E3-4F07-B0F7-A4157ED1BC5B Figs 1A , 2A , 3A , 4A , 5A Diagnosis Head longer than wide. Malar space shorter than VOL. First flagellomere as long as pedicel. Frontal angle of ocellar triangle a right angle. Mesosoma with dorsal pronotal area with anterior corner rounded, with side straight, posterior margin concave; longitudinal pronotal sulcus incomplete. Metapectalpropodeal complex as long as metapectal-propodeal complex half-width, with longitudinal ridge between metapostnotal median and metapostnotal-propodeal carinae; posterior projection of metapectalpropodeal complex present, short, thick, divergent. Lateral surface of metapectal-propodeal complex areolate, with upper carina and posterior carina. Mesopleuron lower half foveolate. Hypopygium as long as wide; anterior stalk wide and long; lateral projection long; posterior margin with branches wide. Genitalia with paramere apex sparse setose; ventral arm of paramere club-shaped, wide at apex; dorsal arm shorter than ventral arm, club-shaped, and with basal margin thin. Aedeagus aligned with paramere apex, apical margin truncate. Etymology The species is named in honour of Olavo Perim Galvão, a friend, an environmental auditor of the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA) and a warrior for environmental causes, who died while fighting against deforestation in the Amazon, the place which he dearly loved. Fig. 1. Mesosoma of Astromesitius gen. nov. , dorsal view. A . A. olavoi gen. et sp. nov. (holotype, QBG) B . A. thionyi gen. et sp. nov. (holotype, UFES 118956) C . A. carbonarius (Móczár, 1970) gen. et comb. nov. (UFES 56168) D . A. indistintus ( Barbosa & Azevedo, 2011 ) gen. et comb. nov. (paratype, UFES) E . A. minutissimus ( Móczár, 1971 ) gen. et comb. nov. (holotype, UFES 56528) F . A. quatei ( Móczár, 1977 ) gen. et comb. nov. (holotype, BPBM). Fig. 2. Hypopygium of Astromesitius gen. nov. A . A. olavoi gen. et sp. nov. (holotype, QBG) B . A. thionyi gen. et sp. nov. (holotype, UFES 118956) C . A. indistintus ( Barbosa & Azevedo, 2011 ) gen. et comb. nov. (paratype, UFES) D . A. minutissimus ( Móczár, 1971 ) gen. et comb. nov. (holotype, UFES 56528) E . A. quatei ( Móczár, 1977 ) gen. et comb. nov. (holotype, BPBM). Fig. 3. Genitalia of Astromesitius gen. nov. , left ventral and right dorsal view. A . A. olavoi gen. et sp. nov. (holotype, QBG) B . A. thionyi gen. et sp. nov. (holotype, UFES 118956) C . A. carbonarius (Móczár, 1970) gen. et comb. nov. (UFES 56168) D . A. indistintus ( Barbosa & Azevedo, 2011 ) gen. et comb. nov. (paratype, UFES) E . A. minutissimus ( Móczár, 1971 ) gen. et comb. nov. (holotype, UFES 56528) F . A. quatei ( Móczár, 1977 ) gen. et comb. nov. (holotype, BPBM). Fig. 4. Head of Astromesitius gen. nov. , dorsal view. A . A. olavoi gen. et sp. nov. (holotype, QBG) B . A. thionyi gen. et sp. nov. (holotype, UFES 118956) C . A. carbonarius (Móczár, 1970) gen. et comb. nov. (UFES 56168) D . A. indistintus ( Barbosa & Azevedo, 2011 ) gen. et comb. nov. (paratype, UFES) E . A. minutissimus ( Móczár, 1971 ) gen. et comb. nov. (holotype, UFES 56528) F . A. quatei ( Móczár, 1977 ) gen. et comb. nov. (holotype, BPBM). Material examined Holotype THAILAND • ♂ ; Chaiyaphum , Pa Hin Ngam N [ational] P[ark]; 15°39.9′ N , 101°27.2′ E ; alt. 357 m ; 26 Dec. 2006 – 2 Jan. 2007 ; Katae Sa-nog & Buakaw Adnafai leg.; deciduous; Malaise trap ; QBG . Paratype THAILAND • 1 ♂ ; Ubon Ratchathani , Pha Taem N [ational] P[ark], Don Huay Can ; 15°40.016′ N , 105°30.502′ E ; alt. 246 m ; 9–15 Jun. 2007 ; Tongcam & Banlu leg.; Malaise trap ; UFES . Description BODY ( Fig. 5A ). 2.4–2.5 mm long; antenna 1.5–1.55 mm long; forewing 1.5 mm long. COLOUR. Head and mesosoma black; clypeus and antenna dark castaneous almost black; mandible, palpi and legs dark castaneous, lighter distad; metasoma dark castaneous almost black; wings hyaline with venation light castaneous. HEAD ( Fig. 4A ). Head longer than wide. Malar space shorter than VOL, parallel. Mandible with three sharp distal teeth. Median clypeal lobe quadrate, apical margin slightly outcurved, median clypeal carina complete, arched in lateral profile. Lateral clypeal lobe short. Antenna very long, reaching the middle of metasoma; scape slightly curved; pedicel caliciform; first flagellomere as long as pedicel; flagellomeres each almost twice as long as wide, proximal ones wider subdistally; flagellomeral pubescence erectsuberect, about 0.5 × as long as flagellomeral diameter. HE about 0.35 × LH. Frons strongly foveolate. Frontal angle of ocellar triangle a right angle. Occipital carina with surface foveolate. MESOSOMA ( Fig. 1A ). Dorsal pronotal area foveolate, shorter than wide, trapezoidal, anterior margin outcurved, anterior corner rounded, lateral margin concave, posterior margin concave; longitudinal pronotal sulcus incomplete, weakly impressed. Anteromesoscutum coriaceous, longer than mesoscutellum; longitudinal anteromesoscutal sulcus absent; notaulus deep, wide, polished, almost entirely straight, converging posterad; parapsidal signum shallow, narrow, straight, parallel. Mesoscutummesoscutellar sulcus straight medially, deep, and laterally dilated; mesoscutellum coriaceous.Metapectalpropodeal disc 0.5 × as long as wide, with incomplete longitudinal ridge between metapostnotal median and metapostnotal-propodeal carinae; metapostnotal surface striate; metapostnotal median carina complete; posterior projection short, thick, discretely divergent posterad. Propodeal declivity areolate, with median and lateral carinae. Lateral surface of metapectal-propodeal complex areolate, subdorsal carina ill-defined, vertical carina complete. Mesopleuron foveolate, but progressively weakening posterad; posterior oblique sulcus foveolate; mesopleural suture with inner margin striate. WINGS. Fore wing with Rs&M vein arched; pterostigma short, about as long as prestigmal abscissa of R1, distal margin convex. Hindwing with three distal hamuli, first hamulus widely separated from others. METASOMA. Mostly polished, tergum I mostly glabrous, subsequent terga progressively more setose laterally and posteriorly. Hypopygium as long as wide; anterior stalk wide and long; lateral projection long; posterior margin with branches short and wide ( Fig. 2A ). GENITALIA ( Fig. 3A ). Paramere apex sparsely setose; ventral arm of paramere club-shaped, wide at apex; dorsal arm shorter than ventral arm, club-shaped, and with basal margin thin. Cuspis ventral arm not reaching dorsal arm apex, wide; dorsal arm wide. Aedeagus slender, with apex aligned with paramere apex, apical margin truncate, lateral margin of basal portion convex. Apodeme parallel, base curved laterad. Fig. 5. Habitus of Astromesitius gen. nov. A . A. olavoi gen. et sp. nov. (holotype, QBG) B . A. thionyi gen. et sp. nov. (holotype, UFES 118956). Remarks This species is similar to Astromesitius carbonarius (Móczár, 1970) and A. minutissimus ( Móczár, 1971 ) , mainly in having the small and black body; the head longer than wide; the hyaline forewing. Astromesitius olavoi gen. et sp. nov. can be distinguished from these two species by having the frons, the dorsal pronotal area and the mesopleuron sparsely foveolate; the dorsal pronotal area with longitudinal sulcus, but inconspicuous; the metapectal-propodeal disc with posterior projection inconspicuous; the genitalia with truncate and projected apex of aedeagus. Thus we did not doubt the validity of a new species. Distribution Thailand .