Closterocerus amaurus, 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 : 19

Closterocerus amaurus sp.nov.

( Figs 22–24 )

Diagnosis. Antenna flattened, scape widest at apex ( Fig. 23 ); ocelli very small, ratio POL/posterior ocellus width 4.7 ( Fig. 24 ); pronotal collar without a carina along anterior margin ( Figs 22, 23 ); midlobe of mesoscutum without setae; fore wing infuscate with a hyaline band close to apical margin and with area just below marginal vein hyaline ( Fig. 23 ); length of body female 1.2mm. A dark species (dark brown to black) with weak metallic tinges on thoracic dorsum.

Female holotype: length of body 1.2mm.

Antenna dark brown to black. Head black. Mesoscutum, mesoscutellum, dorsellum and propodeum black with metallic purple tinges. Coxae, femora and tibiae black; fore tarsus dark brown; mid and hind tarsi with T1–3 white, T4 black. Fore wing infuscate with a hyaline band close to apical margin and with area just below marginal vein hyaline; hind wing hyaline. Petiole not visible in type specimen. Gaster dark brown.

Antenna flattened, scape widest at apex. Frons and vertex with strong reticulation; ocelli small. Frontofacial suture V-shaped. Subtorular sutures present. Occipital margin rounded.

Pronotal collar without a carina along anterior margin. Mesoscutum with strong reticulation; notauli indistinct; midlobe without setae. Mesoscutellum ±flat, with strong reticulation. Dorsellum convex with weak reticulation. Propodeum smooth, without median carina; callus with two setae. Fore wing speculum closed; with a stigmal hairline and with radial cell bare; with hyaline part below marginal vein bare.

Petiole hidden on type specimen. Gaster ovate-elongate; tergites with weak reticulation.

Relative measurements: head length dorsal 14; head length frontal 19; head width 29; POL 7; OOL 2.5; lateral ocellus maximum width 1.5; eye length 11.5; malar space 7; mouth width 6; mesosoma length 33; mesosoma width 25; mesoscutellum length 12.5; mesoscutellum width 14.5; fore wing length 57; fore wing width 32; marginal vein length 31; postmarginal vein length 1.5; stigmal vein length 5; fore wing marginal fringe length 7; gaster length 42; gaster width 26.

Male. Unknown.

Hosts. Unknown.

Distribution. Costa Rica.

Material examined.

Type material. Holotype ♀ “ COSTA RICA: Cartago, Cerro de la Muerte, Villa Mills , 3000m, 9°34´N 83°44´W, i-v.1991, P. Hanson ” ( NHMUK).

Etymology. From the Greek amauros = dark, referring to the dark appearance of this species.

Figures

Figs 20–24. Closterocerus spp. C. alpestris, holotype ♀ – (20) habitus dorsal view; (21) habitus lateral view. C. amaurus, holotype ♀ – (22) habitus dorsal view; (23) habitus lateral view; (24) vertex.