Perilampus yemenensis Yoo and Darling, 2021

Darling, D. Christopher & Yoo, Jeong, 2021, The Perilampidae of the United Arab Emirates and Yemen (Hymenoptera: Chalcidoidea), Zootaxa 5020 (1), pp. 101-129 : 125-126

Perilampus yemenensis Yoo and Darling n. sp.

Figures 10A‒F , 11A‒E , Appendix 1

Material examined. Holotype. “ Yemen: Abyan, Al Kowd , 13°5'0"N, 45°22'0"E, 1-5 Sep 2001, A van Harten; S Al Haruri, Light trap ”, “Digital Image Voucher 2019, Royal Ontario Museum”. The holotype is point-mounted (Female: ROME159199 , ROME).

Paratype. Yemen: Abyan, Al Kowd , 13°5'0"N, 45°22'0"E: Jul-Sep 2001, A van Harten; S Al Haruri, Malaise trap (1 female: ROME159195 - EAD) ; (1 male: DCD Slide #2251 ♂ genitalia, ROME159193 - ROME) .

Etymology. The specific epithet is a reference to Yemen, the only country where specimens of this species have been collected.

Description. Length: approximately 1.8‒2.3 mm (HT 2.1 mm). Color: black, scutellum with blue iridescent reflections, dorsellum black with blue reflections. Legs: coxae black, hind femora black or brown, pro and meso femora and tibiae brown, lighter distad and on inner surfaces, with weak blue reflections, tarsi brown. Antennae: scape brown, lighter distad, pedicel and flagellum brown.

Head: ( Figs 10B, 10C ) in frontal view quadrate, slightly wider than high, HW/HH approximately 1.2, sparsely setose to smooth; in dorsal view weakly transverse ( Fig. 10B ), width same or slightly greater than twice length, HW/HL 2.0–2.1; wider than pronotum, HW/PW approximately 1.3. Frontal carina: absent. Scrobal cavity: shallow; weak round swelling originating from between median and lateral ocelli extend towards eye margin. Ocelli: large; forming a wide triangle, POL about twice distance between posterior and anterior ocelli; POL very long,>2.5× OOL. Vertex: rounded behind; smooth, interocellar region with long groove originating from occiput to anterior ocellus ( Fig. 10B , arrow); occiput with median furrow delimited below vertex, with costulae. Outer orbits: smooth, strong costulae behind. Inner orbits: in lateral view, nearly parallel to inner eye margin; smooth. Malar space: short, about 0.2× eye height, MS/EH approximately 0.2; malar sulcus distinct; very weakly coriarious ( Fig. 10C ). Clypeus: weakly transverse, wider than high, CW/ CH approximately 1.7–1.8, trapezoidal, lateral sulci weak and straight or weakly rounded, weakly divergent; epistomal sulcus straight or weakly concave, same strength as lateral sulci, only slightly extended ventrad; lower margin convex. Supraclypeal area: subquadrate, 0.7–0.8× CH. Antenna: scape length approximately 0.5× EH; anellus length approximately 0.1× PL; F1 subquadrate, shorter than pedicel, F1L/PL approximately 0.6–0.7, F2 subquadrate, F3–F7 transverse; clava 4-segmented, with distinct terminal button.

Mesosoma ( Figs 10A, 10D, 10E, 10F , 11A ): length approximately 1.3× maximum width. Pronotum in dorsal view: short, about 0.25× length of mesoscutum, PN/MSC 0.2–0.3; shorter along midline, 0.5‒0.6× length laterad; anterior margin sharp, the first row of punctures slightly lower; without flange on lateral panel of pronotum at the level of mesothoracic spiracle. Lateral panel of pronotum: slightly wider than prepectus, LPP/PPT approximately 1.2–1.3; flat, with 3 rows of punctures and wide coriarious interspaces dorsad, ventrad with wide coriarious patch; anterior margin slightly rounded; posterior margin ventrad grooved, with row of alveolae. Prepectus ( Fig. 10D ): narrow; nearly indistinguishable from pronotum, without distinct suture; ventral strap long ( Fig. 10D , arrow), with row of alveolae; central area smooth, with foveae along dorsal and posterior margins. Femoral depression: nearly smooth. Midlobe of mesoscutum ( Fig. 11A ): without transverse tubercle; punctures rounded to weakly angulate, with wide and coriarious interspaces. Lateral lobe of mesoscutum: smooth dorsad; coriarious-punctate laterad. Scutellum: about as long as mesoscutum, SC/MSC approximately 1.1; posterior margin smoothly rounded; punctures rounded to weakly angulate, with wide and coriarious interspaces. Axilla: punctate dorsad, imbricate below. Axillula: short triangular lobe, shorter than width at base, smooth. Propodeum ( Fig. 10E ): length along midline about 0.3× width of propodeum; submedian area imbricate, with weak groove along median carina; weakly imbricate laterad; plicae incomplete laterad, delimited ventrad by plicae, dorsad by transverse band of foveae; propodeal spiracle margin narrowly foveate ventrad; nucha rugulose. Fore wing ( Fig. 10F ): postmarginal vein long, 0.8‒0.9× length of marginal vein, 1.4‒1.6× length of stigmal vein; stigmal vein with weak uncus.

Metasoma: petiole short with large smooth to weakly rugulose raised scale (10E, arrow); Gt2 smooth, posterior margin weakly concave at middle; Gt3 smooth.

Male. Length: approximately 1.7mm. Color, structure, and sculptures similar to female except as follows: Head ( Fig. 11B ): in dorsal view quadrate. Ocelli: larger. Malar space: shorter, with stronger coriarious sculpture ( Fig. 11C ). Scape ( Fig. 11D ): about 0.5× EH; weakly stout, length about 4.7× width above radicle; strongly expanded distad, about 1.2× width above radicle; punctures covering about 0.4× scape length, with slightly wide interspaces. Mesosoma: more elongate, length approximately 1.4× maximum width. Gt3: weakly imbricate dorsad. Aedeagus: with paired lateral spines ( Fig. 11K , arrow).

Diagnosis. The following combination of characters will distinguish P. yemenensis from the other species of the P. tristis species group: postmarginal vein longer than stigmal vein ( Fig. 10F ), indistinct suture between prepectus and pronotum ( Fig. 10D ), strongly imbricate submedian area of propodeum ( Fig. 10E ), mesonotum with coriarious interspaces ( Fig. 11A ), weakly bluish iridescence on scutellum, coriarious malar region, which is stronger in male ( Figs 10C , 11C ), and slightly stout male scape with large punctures covering slightly less than 0.5 scape length ( Fig. 11D ).

Figures

FIGURE 10. Perilampus yemenensis and P. houbaraensis. A‒F, P. yemenensis: A, habitus, lateral view; B, head, dorsal view; C, lower face sculpture; D, prepectus; E, propodeum; F, fore wing venation. G‒L, P. houbaraensis: G, habitus, lateral view; H, head, dorsal view; I, lower face sculpture; J, prepectus; K, propodeum; L, fore wing venation. [A‒F: Holotype, ROME159199; G‒L: Holotype, ROME159089]

FIGURE 11. Perilampus yemenensis and P. houbaraensis. A‒E, P. yemenensis: A, mesosoma, dorsal view; B, head, dorsal view, male; C, lower face sculpture male; D, scape, male; E, aedeagus, male, DCD Slide #2251, ventral view; F‒K, P. houbaraensis: F, mesosoma, dorsal view; G, head, dorsal view, male; H, lower face sculpture, male; I, scape, male; J, scape, male; K, aedeagus, male, dorsal view [A: Holotype, ROME159199; B‒E: Paratype, ROME159193; F: Holotype, ROME159089; G‒I: Paratype, ROME159087; J and K: Paratype, ROME159086].