Closterocerus alas, 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 : 15-16

Closterocerus alas sp.nov.

( Figs 13 , 16–19 )

Diagnosis. Antenna flattened, scape widest at apex ( Fig. 19 ); frontofacial suture weakly V-shaped, almost straight ( Fig. 19 ); pronotal collar with an indistinct carina along anterior margin ( Fig. 16 ); midlobe of mesoscutum with two pairs of strong setae ( Fig. 13 ); fore wing hyaline with an infuscate band below marginal vein and one along apical margin ( Figs 16, 18 ); length of body female 1.5mm, male 1.2mm.

Female holotype: length of body 1.5mm.

Antenna dark brown. Frons golden-green. Vertex metallic bluish-green. Mesoscutum and mesoscutellum metallic bluish-purple. Dorsellum and propodeum metallic purple. Coxae dark brown; fore femur whitish, mid femur infuscate, hind femur dark brown; fore and mid tibiae whitish, hind tibia dark brown; fore and mid tarsi whitish, hind tarsus infuscate. Fore wing hyaline with an infuscate band below marginal vein and one along apical margin, hind wing hyaline. Petiole dark brown. Gaster dark brown with metallic purple and golden tinges.

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

Pronotal collar with an indistinct carina along anterior margin. Mesoscutum with strong reticulation; notauli distinct in anterior one-third; midlobe with two pairs of long setae. Mesoscutellum convex, with strong reticulation. Dorsellum convex and smooth. Propodeum smooth, without median carina; callus with two setae. Fore wing with speculum closed; without a stigmal hairline but with radial cell bare.

Petiole very short, just a narrow band. Gaster ovate-elongate; tergites smooth.

Relative measurements: head length dorsal 17.5; head length frontal 22; head width 34.5; POL 7.5; OOL 2.5; lateral ocellus maximum width 2.5; eye length 16.5; malar space 6; mouth width 10.5; mesosoma length 47; mesosoma width 29.5; mesoscutellum length 16; mesoscutellum width 17; fore wing length 75; fore wing width 46; marginal vein length 41; postmarginal vein length 5; stigmal vein length 6; fore wing marginal fringe length 4; gaster length 50; gaster width 27.

Variation in paratype material. Length of body: 1.5–2.0mm. Vertex metallic bluish-green or bluish-purple. Mid femur infuscate to pale brown.

Male ( Figs 17, 18 ). Length of body: 1.2mm. Vertex and mesoscutum golden-green ( Fig. 17 ); mesoscutellum golden with lateral and posterior margins golden-green ( Fig. 17 ). Otherwise similar to female.

Hosts. Unknown.

Distribution. Costa Rica.

Material examined.

Type material. Holotype ♀ “ COSTA RICA: Heredia, 6km ENE Vara Blanca , 10˚11’N, 84˚07’W, 2000m, 21.iv.2002, 20/M/12/092, INBio, OET,ALAS” ( NHMUK) . Paratypes (1♀ 1♂): from same locality as holotype but collected iv.2002 (♂, NHMUK) , iii.2002 (♀, MZLU) .

Etymology. Named after the project to collect insects and other arthropods at, and in the vicinity of, the field station La Selva (ALAS = Arthropods of La Selva); noun in apposition.

Figures

Figs 6–13. Closterocerus spp. C. coffeellae – (6) scape+pedicel ♀; (7) antennal flagellum ♀; (8) head posterior view ♀; (9) scape ♂; (10) mesoscutum dorsal view ♀; (11) antennal sensillum ♀; (12) thorax lateral view ♀. C. alas, paratype ♀ – (13) mesoscutum dorsal view. Abbreviations: cx1 = fore coxa; cx2 = mid coxa; og = occipital groove; sa = sense area; tps = transepimeral sulcus.

Figs 14–19. Closterocerus spp. C. aglaia, ♀ – (14) habitus dorsal view, holotype; (15) habitus lateral view, paratype. C. alas – (16) habitus dorsal view, holotype ♀; (17) habitus dorsal view, paratype ♂; (18) habitus lateral view, paratype ♂; (19) head frontal view, paratype ♀.