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

description: Closterocerus arenalensis sp.nov.   
(Figs 156, 157, 163)  
 Diagnosis. Antenna flattened, scape widest at apex, all flagellomeres distinctly separated (Figs 157, 163); upper border of frons distinct (Fig. 157); pronotal collar with a carina along anterior margin (Fig. 156); midlobe of mesoscutum without setae (Fig. 156); petiole as long as wide with strong sculpture on dorsal surface; hind tarsus with T1 and T4 dark brown, T2–3 white (Fig. 163); fore wing infuscate with basal one-third and a subapical band hyaline, speculum open below (Figs 156, 163); length of body female 1.1–1.6mm. Similar to C. hirsutus but with only two setae on propodeal callus, mesoscutellum with weaker reticulation, and hind tarsus shorter, 0.63× as long as hind tibia.   
Female holotype: length of body 1.4mm.  
 Antenna dark brown to black. Frons below frontofacial suture golden-green, above suture black with metallic tinges. Vertex metallic purple. Mesoscutum with midlobe golden with anterolateral parts metallic bluish-purple, sidelobes metallic bluish-purple. Mesoscutellum golden with lateral and posterior margins metallic bluish-purple. Dorsellum metallic bluish-purple. Propodeum black. Coxae, femora, mid and hind tibiae black with metallic tinges; fore tibia and tarsus infuscate, mid tarsus with T1–3 white and T4 infuscate, hind tarsus with T1 and T4 black, T2–3 white. Fore wing infuscate with basal one-third and a band close to apical margin hyaline, hind wing hyaline. Petiole black. Gaster with Gt 1 metallic bluish-purple, remaining tergites dark brown with metallic tinges.   
Antenna flattened, scape widest at apex. Frons with strong reticulation; frontofacial suture Vshaped; upper border of frons distinct. Subtorular sutures present but difficult to see because they are short and dark. Vertex with strong reticulation. Occipital margin with a carina behind ocellar triangle, rounded laterally.  
Pronotal collar with a carina along anterior margin. Mesoscutum with strong reticulation; notauli distinct throughout; midlobe without setae. Mesoscutellum convex, with weak reticulation. Dorsellum convex and smooth. Propodeum with weak reticulation, partly smooth, with a median carina; callus with two setae. Fore wing speculum open below, with hyaline part below marginal vein bare; with a stigmal hairline and with radial cell bare.  
 Petiole as long as wide, dorsal surface with strong sculpture. Gaster short-ovate, almost circular; Gt 1-2 smooth, remaining tergites with strong reticulation.   
Relative measurements: head length dorsal 19; head length frontal 21.5; head width 38; POL 6.5; OOL 4; lateral ocellus maximum width 3; eye length 19.5; malar space 5; mouth width 10.5; mesosoma length 46; mesosoma width 33; mesoscutellum length 18.5; mesoscutellum width 19; fore wing length 70; fore wing width 41; marginal vein length 40; postmarginal vein length 2.5; stigmal vein length 5.5; fore wing marginal fringe length 5; gaster length 44; gaster width 33.5.  
 Variation in paratype material. Length of body: 1.1–1.6mm. Vertex metallic purple, or metallic purple with posterior one-half metallic blue. Midlobe of mesoscutum golden-red or golden with anterolateral parts metallic bluish-purple. Mesoscutellum golden-red or golden with lateral and posterior margins metallic bluish-purple. Gt 1 metallic bluish-green or bluish-purple.   
Male. Unknown.  
 Hosts. Unknown.   
 Distribution. Costa Rica.   
 Material examined.   
Type material. Holotype ♀ “ COSTA RICA: Alajuela, P.N.Arenal, 10˚28’N, 84˚45’W, 617m, 21-28.ii.2005, C. Hansson ” (MZLU). Paratypes (6♀, MZLU, MZUCR, NHMUK): 5♀ with same label data as holotype; 1♀ “ COSTA RICA: Alajuela, P.N. Arenal, La Peninsula, 10˚27’N, 84˚45’W, 600m, 25.ii.2003, J.S. Noyes ”.  
 Etymology. From the type locality and the Latin suffix -ensis = place, locality.
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 23-24, DOI: 10.5281/zenodo.6464279