Closterocerus triquetrus Hansson 2022, sp.nov.
Creators: name: Hansson, Christer
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Eulophidae
Closterocerus
Closterocerus triquetrus

description: 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.
description: Published as part of Hansson, Christer, 2022, Eulophidae Of Costa Rica (Hymenoptera: Chalcidoidea), 4 The Genus Closterocerus Westwood S. Str., pp. 1-137 in Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) (Oxford, England) 1 (1) on pages 79-80, DOI: 10.5281/zenodo.6464279