Calobrachium lepidum ( Terayama, 2004 )

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: 224-227

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Calobrachium lepidum ( Terayama, 2004 )

comb. nov.

Calobrachium lepidum ( Terayama, 2004)  , comb. nov.

( Figs 1View FIGURES 1 – 9, 10View FIGURES 10 – 18, 23View FIGURES 23 – 30, 31, 32, 33View FIGURES 31 – 38)

Pseudisobrachium lepidum Terayama, 2004  27: 25.

Redescription. MALE. Body length 3.1 mm. LFW 2.2 mm. Color. Head black; mandible, clypeus, antenna, mesosoma and metasoma castaneous; legs light castaneous; wings hyaline.

Head ( Fig. 1View FIGURES 1 – 9). Mandible with three upper teeth small, being subupper one very small, lowest one largest. Apical margin of median clypeal lobe straight. Flagellomeres long; four first antennomeres in ratio about 13:4:10:8; pedicel 1.0 × as long as wide; F1 2.7 × as long as wide; F9 1.8 × as long as wide; flagellar setae suberect and erect. Frontal carina slightly conspicuous. WH 0.9 × LH. WF 0.7 × WH. WF 1.5 × HE. Eye small, very salient. Ocellus small. DAOAbout DAO 0.2 × WF. Frontal angle of ocellar triangle acute. WOT 2.3 × DAOAbout DAO. OOL 1.4 × WOT. Distance of posterior ocellus to vertex crest 1.6 × DAOAbout DAO. VOL 1.1 × HE. Temple strongly divergent. Vertex straight.

Mesosoma ( Figs 11View FIGURES 10 – 18, 19View FIGURES 19 – 22). Pronotal disc densely punctate, 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; quadrangular. Notauli conspicuous, occupying one-fifth of mesoscutum. Scutellar furrow narrow, deep, slightly scrobiculate; corner straight. Median region of scutellum coriaceous, punctate. Median region of metanotum short, narrow; inner foveae of metanotal furrow not delimited. Propodeal disc 1.2 × as long as wide; 0.4 × as high as long; areolate; lateral carina inconspicuous; propodeal declivity slightly areolate; side of propodeum slightly areolate. Mesopleuron anteriorly slightly rugulose, posteriorly slightly areolate; transversal furrow conspicuous, slightly scrobiculate. Discoidal vein strongly pigmented.

Metasoma. Petiole long, 0.4 × as long as propodeal disc. Hypopygium ( Fig. 23View FIGURES 23 – 30) 1.1 × as long as wide; posterior margin strongly trilobate; median lobe convex, wide; posterior projection short; lateral lobe convex; lateral margin slightly convex; anterior pigmented line strongly pigmented, slender; lateral stalk absent. Genitalia ( Figs 31–32View FIGURES 31 – 38): aedeagus slightly mesoconvex, apical region ventrad with lobe long; dorsal paramere about as long as ventral paramere, basal region narrow, apical region almost as wide as ventral paramere, inner margin straight, outer margin slightly convex; membranous region of basiparamere with apical corner strongly developed; sclerite on volsella base absent.

FEMALE unknown.

Material examined. Holotype, ♂ of Pseudisobrachium lepidum Terayama, 2004  . THAILAND, Chiang Mai, Doi Inthanon NP, 2.200 m, 28.IV–6.V.1990, MT 3, Oak Forest , B.V. Brown leg. [ PMAEAbout PMAE]. 

Distribution. Thailand (Chiang Mai).

Remarks. Terayama (2004) allocated this species putatively in Pseudisobrachium  because it has the clypeus with trapezoidal median lobe, the pronotal disc trapezoidal. He emphasized that this species was peculiar by having slender legs, mesoscutal dorsum concave anteriorly, notauli impressed only anteriorly on the mesoscutum surface, and propodeal disc without longitudinal carinae. However he did not studied the genitalia and hypopygium, what led him not to realize how different this species is when compared to the body plan of Pseudisobrachium  .

Calobrachium lepidum  comb. nov., C. luangum  sp. nov., C. miticum  sp. nov. and C. trilinum  sp. nov. are similar one to another because they have the flagellomere I very long, the eyes small and very salient, the ocelli small, the frons with frontal carina anteriorly between the toruli, and the temple divergent. Such combinations of characters give to the head a distinct shape, which easily makes them among other species of Calobrachium  . However they have distinct differences. Calobrachium lepidum  comb. nov. has mandibular subupper tooth very small, the scutellar furrow narrow, the lateral carina of propodeal disc inconspicuous, the transversal furrow of mesopleuron slightly scrobiculate, the lateral hypopygeal lobe developed and convex, the aedeagus slightly mesoconvex, the dorsal paramere with basal region narrow and apex almost as wide as ventral paramere, with inner margin straight. Calobrachium luangum  sp. nov. has the mandibular teeth equally-sized, the scutellar furrow wide, the transversal furrow of mesopleuron strongly scrobiculate, the lateral hypopygeal lobe not developed, the aedeagus strongly mesoconvex, the dorsal paramere wider than ventral paramere, with inner margin sinuous. Calobrachium miticum  sp. nov. has the subupper tooth very small, the frontal carina strongly conspicuous, the median region of metanotum long, and the dorsal paramere shorter than ventral paramere. Calobrachium trilinum  sp. nov. has the flagellomeres median-sized, the notauli absent, the inner foveae metanotal furrow delimited, the petiole short, the posterior hypopygeal margin with median lobe angulate and narrow, the lateral margin convex, the dorsal paramere with inner e outer margins sinuous, the membranous region of basiparamere forming two frontal lobes.


Agriculture and Agri-Food Canada


Royal Alberta Museum














Calobrachium lepidum ( Terayama, 2004 )

Gobbi, Fernanda T. & Azevedo, Celso O. 2016


Pseudisobrachium lepidum

Terayama 2004