Calobrachium thanum Gobbi & Azevedo

Gobbi, Fernanda T. & Azevedo, Celso O., 2016, Revision of Calobrachium Gobbi & Azevedo, gen. nov. (Hymenoptera, Bethylidae), with description of seven new Oriental species, Zootaxa 4083 (2), pp. 221-238: 233-234

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Calobrachium thanum Gobbi & Azevedo

sp. nov.

Calobrachium thanum Gobbi & Azevedo  , sp. nov.

( Figs 7View FIGURES 1 – 9, 15View FIGURES 10 – 18, 21View FIGURES 19 – 22, 28View FIGURES 23 – 30, 42, 43View FIGURES 39 – 47)

Description. MALE. Body length 1.7 mm. LFW 1.4 mm. Color. Head dark castaneous; mandible, clypeus, mesosoma and metasoma castaneous; antenna and legs light castaneous; wings hyaline.

Head ( Fig. 7View FIGURES 1 – 9). Mandible with teeth small and almost equally sized. Apical margin of median clypeal lobe straight. Flagellomeres long; four first antennomeres in ratio about 13:4:8:5; pedicel 1.3 × as long as wide; F1 long, 2.6 × as long as wide; F9 1.7 × as long as wide; flagellar setae suberect. Frontal carina absent. WH 0.9 × LH. WF 0.7 × WH. WF 1.4 × HE. Eye small, salient. Ocellus small. DAOAbout DAO 0.2 × WF. Frontal angle of ocellar triangle acute. WOT 2.3 × DAOAbout DAO. OOL 1.2 × WOT. Distance of posterior ocellus to vertex crest 0.8 × DAOAbout DAO. VOL 0.9 × HE. Temple parallel or almost this. Vertex straight.

Mesosoma ( Figs 15View FIGURES 10 – 18, 21View FIGURES 19 – 22). Pronotal disc and mesonotum sparsely punctate. Pronotal collar short. Pronotal declivity low. Pronotal disc 0.5 × as long as wide; anterior region 0.4× as long as wide; rounded. Notauli conspicuous, occupying one third of mesoscutum. Scutellar furrow wide, deep, slightly scrobiculate; corner convex. Median region of scutellum slightly coriaceous, punctate. Median region of metanotum short, wide; inner foveae of metanotal furrow not delimited. Propodeal disc 1.3 × as long as wide; 0.5 × as high as long; imbricatepolished; lateral carina conspicuous; propodeal declivity polished; side of propodeum slightly imbricate. Mesopleuron polished; transversal furrow inconspicuous. Discoidal vein not pigmented.

Metasoma. Petiole short; 0.2 × as long as propodeal disc. Hypopygium ( Fig. 28View FIGURES 23 – 30) 1.0 × as long as wide; posterior margin strongly trilobate; median lobe angulate, slender; posterior projection short; lateral lobe angulate; lateral margin medially angulate; anterior pigmented line strongly pigmented, slender; lateral stalk absent. Genitalia ( Figs 41– 42View FIGURES 39 – 47): aedeagus slightly mesoconvex; projection of apical region ventrad absent; dorsal paramere shorter than ventral paramere, slightly wider as ventral paramere, inner margin straight, outer margin straight; membranous region of basiparamere forming two frontal large lobes; sclerite on volsella base absent.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND, Chaiyaphum, Tat Tone NP, Oficer house at Tat Fah waterfall, 15°56.461’N 102°5.955’E, 242 m, MT, 5–12.III.2007, Tawit Jaruphan & Orawan Budsawong leg., T2347 ( QSBG).GoogleMaps 

Distribution. Thailand (Chaiyaphum).

Remarks. It is similar to C. salum  sp. nov. by having the flagellomere I long, the ocelli small, the temple almost parallel. However, C. thanum  sp. nov. has the apical margin of median clypeal lobe straight, the pronotal collar short, the pronotal declivity short, the inner foveae of metanotal furrow not delimited; transversal furrow of mesopleuron inconspicuous, the hypopygium with lateral margin medially angulate, the dorsal paramere shorter than ventral paramere, the membranous region of paramere forming two large frontal lobes, and the volsella base without sclerite, whereas C. salum  sp. nov. has the apical margin of median clypeal lobe angularly concave, the pronotal collar long, the pronotal declivity long, the inner foveae of metanotal furrow delimited, transversal furrow of mesopleuron slightly scrobiculate, the hypopygium with lateral margin slightly convex, the dorsal paramere slightly longer than ventral paramere, the membranous region of paramere with apical corner strongly developed, and sclerite on volsella base present.


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