Closterocerus triquetrus, Hansson, 2022

Hansson, Christer, 2022, Eulophidae Of Costa Rica (Hymenoptera: Chalcidoidea), 4 The Genus Closterocerus Westwood S. Str., Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) 1 (1), pp. 1-137 : 79-80

Closterocerus triquetrus sp.nov.

( Figs 170 , 175–177 , 216 , 226 )

Diagnosis. Antenna flattened, scape widest at apex ( Figs 177 , 226 ); frons with upper border distinct ( Fig. 177 ); ocelli small, ratio POL/posterior ocellus width = 3.2 ( Fig. 175 ); pronotal collar without a carina along anterior margin ( Figs 170 , 175 ); midlobe of mesoscutum with two pairs of setae ( Figs 170 , 175 ); fore wing triangular and infuscate with two hyaline areas, one L-shaped spot below marginal vein and one band close to apical margin ( Figs 175 , 216 ); hind tarsus with T1–3 white, T4 dark brown ( Fig. 176 ); length of body both sexes 1.1mm.

Female holotype: length of body 1.1mm.

Antenna dark brown. Frons golden-green. Vertex metallic bluish-green. Mesoscutum, mesoscutellum, dorsellum and propodeum metallic bluish-purple. Coxae, femora, mid and hind tibiae dark brown; fore tibia white with basal one-third dark; all tarsi with T1–3 white and T4 dark brown. Fore wing triangular and infuscate with two hyaline areas, one L-shaped spot below marginal vein and one band close to apical margin; hind wing hyaline. Petiole dark brown. Gaster with Gt 1-3 dark brown with lateral parts metallic purplish; remaining tergites dark brown with metallic tinges.

Antenna flattened, scape widest at apex. Frons with weak reticulation; frontofacial suture V-shaped; upper border distinct. Vertex with strong reticulation; ocelli small. Subtorular sutures present. Occipital margin rounded.

Pronotal collar without a carina along anterior margin. Mesoscutum and mesoscutellum with weak reticulation, meshes small and slightly transverse; notauli narrow and complete; midlobe of mesoscutum with two pairs of setae. Dorsellum convex and smooth. Propodeum reticulate with median part smooth, without median carina; callus with two setae. Fore wing triangular; speculum closed; with a stigmal hairline and with radial cell bare.

Petiole very short, just a narrow band. Gaster oval-shaped; tergites with very weak reticulation.

Relative measurements: head length dorsal 15; head length frontal 18; head width 28; POL 5.5; OOL 3; lateral ocellus maximum width 1,7; eye length 13.5; malar space 5; mouth width 7; mesosoma length 32; mesosoma width 21.5; mesoscutellum length 13.5; mesoscutellum width 13.5; fore wing length 46; fore wing width 27.5; marginal vein length 28; postmarginal vein length 1.5; stigmal vein length 3.5; fore wing marginal fringe length 5; gaster length 40; gaster width 26.

Male. Length of body: 1.1mm. Frons golden-purple. Mesoscutum with sidelobes golden-purple, midlobe of mesoscutum and mesoscutellum golden-red with sides metallic bluish-green, dorsellum and propodeum metallic bluish-green. Otherwise as in female.

Hosts. Unknown.

Distribution. Mexico.

Material examined.

Type material. Holotype ♀ “ MEXICO: Oaxaca, 10mi E Totolapan , 20.vii.1987, 4000’ [1219m], J.B. Woolley, 87/052” ( TAMU) . Paratype: 1♂ with same label data as holotype ( TAMU) .

Etymology. From the Latin triquetrus = triangular, referring to the triangular fore wing.

Figures

Figs 164–170. Closterocerus spp. C. tapantibius, ♀ – (164) habitus dorsal view, holotype; (165) habitus lateral view, paratype; (166) vertex, holotype. C. tischeriae – (167) habitus lateral view, paratype ♂; (168) habitus dorsal view, paratype ♀; (169) habitus dorsal view, paratype ♂. C. triquetrus, paratype ♂ – (170) habitus dorsal view.

Figs 171–177. Closterocerus spp. C. trimaculatus – (171) habitus dorsal view, paratype ♀; (172) habitus lateral view, paratype ♀; (173) habitus lateral view, paratype ♂. C. tischeriae, holotype ♀ – (174) habitus lateral view. C. triquetrus – (175) habitus dorsal view, holotype ♀; (176) habitus lateral view, holotype ♀; (177) head frontal view, paratype ♂.

Figs 214–223. Closterocerus spp. ♀ – 214–218. Fore wing – (214) C. platycerus; (215) C. scitulus; (216) C. triquetrus; (217) C. woolleyi; (218) C. whartoni. – 219–222.Antenna lateral view – (219) C. complanatus; (220) C. coffeellae; (221) C. deltoides; (222) C. nitidulus. – 223. C. mirandus ♀, head+antenna lateral view.

Figs 224–232. Closterocerus spp. ♀ – 224–229. Antenna lateral view – (224) C. petiolatus; (225) C. platycerus; (226) C. triquetrus; (227) C. scitulus; (228) C. trimaculatus; (229) C. stigmalis. – 230. C. woolleyi ♀, head+antenna lateral view. – 231–232. Head frontal view – (231) C. woolleyi; (232) C. nitidulus.