Kressleinius celans Domer & Burks, 2020

Domer, Tiffany C., Burks, Roger A., Krogmann, Lars & Heraty, John M., 2020, Patching up the past one fossil at a time: A new genus and species of Eulophidae from Eocene Baltic Amber (Hymenoptera, Chalcidoidea), Journal of Hymenoptera Research 79, pp. 27-42 : 27

Kressleinius celans Domer & Burks sp. nov.

Specimen condition.

Face obscured by antenna. Propodeum and metanotum obscured by air bubble. Setae on mesoscutellum obscured by debris. Nematoceran fly present as a separate inclusion.

Description.

Female: Body length 1.7 mm.

Color: head dark, lower part of face pale; flagellum brown with multiporous plate sensillae white; mesosoma dark, mesosomal setae pale; legs pale; gaster with pale lateral markings on metasomal terga 3-6.

Head height 1.4 × eye height, sculpture reticulate to imbricate, face alveolate; lateral ocellus not adjacent to eye; eye large; mandible endodont and of normal size. Antenna with first funicular (F1) as long as broad, F2 0.8 × as long as broad, F3 0.7 × as long as broad; clava 1.2 × as long as broad and with apical spine; pedicel without raised sculpture.

Mesosoma length 1.6 × its height with reticulate to imbricate sculpture, not flattened. Pronotum without collar; prosternum diamond shaped; propleura diverging; mesoscutum side lobe densely setose and with 1 pair of long posterodorsal setae; mesoscutal midlobe with 2 subparallel rows, distant from notauli, with 3 pairs of small setae anteriorly and 1 large pair posteriorly; dorsellum short (but view distorted by air bubble); propodeum short, without carinae; legs with metatibial spur not elongate.

Fore wing not reduced, 2.1 × as long as broad. Relative lengths of costal cell and venation (compared to stigmal vein length): costal cell 3.0, parastigma 1.1, marginal vein 2.4, stigmal vein 1.0, postmarginal vein 1.5; cubital setal line extending from base of wing across speculum.

Metasoma with small, inconspicuous petiole. Gaster length 3.1 × as high; hypopygium extending to Mt3; gaster not strongly sclerotized, syntergum present.

Material examined.

Baltic amber inclusion. Holotype: female SMNS BB-2847. Deposited in SMNS.

Etymology.

The name Kressleinius celans , a Latin participle meaning concealing, was chosen because of the air bubble hiding diagnostic structures on the fossil.