Horismenus saueri Pikart, 2024

Pikart, Tiago G., Schoeninger, Karine, Costa, Valmir A., Hansson, Christer, Zanuncio, José C. & Serrão, José E., 2024, Nine new species of Horismenus Walker (Hymenoptera: Eulophidae) in Brazil, with an emphasis on the fauna of one of the largest tropical forests on the planet, the Atlantic Forest, Zootaxa 5453 (1), pp. 33-62 : 57-60

Horismenus saueri Pikart , Costa & Hansson, sp. nov.

Figs 82–90

Type material. Holotype ♀ point mounted, with label “[ Campinas ], São Paulo, BRASIL, 17/8/1939, HFG Sauer ”, “371.”, “ IB-CBE nº 00023” (deposited in MZUSP) . Paratypes. 11♀, with same label data as holotype, but with unique-identifier, IB-CBE nº 00021, 00022, 00024 e 02107–02114 (5♀ MZSP, 4♀ BMNH, 2♀ IB-CBE) .

Type condition. Holotype and paratypes in good condition, except for one paratype with left antenna missing the last flagellomere.

Diagnosis. Antennal scrobes joining below frontofacial sulcus ( Fig. 84 ); malar sulcus present; mesoscutum with strong raised reticulation ( Fig. 89 ); mesoscutellum smooth and shiny ( Fig. 89 ); mesoscutum metallic bluishgreen with golden luster, mesoscutellum black shiny ( Fig. 83 ); propodeal callus with 2 setae; femora and tibiae yellowish brown ( Fig. 82 ); eyes large and frons narrow ( Fig. 85 ), DE/DO= 2.3; hind tibial spur short, LS/LT= 0.2; gaster conspicuously pilose ( Fig.90 ). Similar to Horismenus argus Hansson , but posterior ocellus closer to occipital margin than to eye, malar sulcus present, midlobe of mesoscutum with completely raised reticulation ( Fig. 89 ) and hind tibial spur shorter.

Description. Female. Length of body 2.5–2.7 mm.

Color. Scape, pedicel and flagellum metallic bluish green to metallic dark blue ( Fig. 84 ). Lower frons black shiny, malar space metallic golden green, remaining parts of frons blue to metallic bluish green ( Fig. 84 ); vertex metallic golden green. Mesoscutum metallic bluish green with golden tinges ( Fig. 83 ). Mesoscutellum black shiny, lateral and posterior margins with dark bluish green to golden green tinges ( Fig. 83 ). Propodeum metallic bluish green with golden tinges, some reticulate parts black shiny ( Fig. 83 ). Coxae metallic dark blue; femora, tibiae and tarsi yellowish brown to pale brown ( Fig. 82 ). Wings hyaline. First gastral tergite with anterior one-third to half metallic bluish green with golden tinges, remainder black; remaining tergites black.

Head. Antennae as in Fig. 86 . Lower frons with strong raised reticulation, remaining parts of frons smooth and shiny to weakly reticulate ( Fig. 85 ); frontofacial sulcus V-shaped, incomplete, and not reaching eyes; antennal scrobes joining below frontofacial sulcus ( Fig. 84 ). Malar sulcus present. Vertex ( Fig. 87 ) with raised reticulation laterally, area in front of anterior ocellus and within ocellar triangle with engraved reticulation; median groove present posteriorly. Occipital margin slightly rounded.

Mesosoma. Mesoscutum ( Fig. 89 ) with strong raised reticulation; notauli distinct. Mesoscutellum ( Fig. 89 ) smooth and shiny; lateral mesh-rows almost reaching the mesoscutellar foveae. Metascutellum convex, smooth and shiny, with two foveae anteriorly. Propodeum ( Fig. 88 ), including anterolateral foveae, smooth and shiny, median carina weakly reticulate; submedian grooves, nucha and plicae with strong raised reticulation; anterolateral foveae wide with lateral margins rounded ( Fig. 88 ); propodeal callus with 2 setae. Coxae weakly reticulate. Fore wing with speculum closed posteriorly, with 21–27 admarginal setae, costal cell bare.

Metasoma. Gaster pilose ( Fig. 90 ), with first tergite smooth and shiny with a large area in the posterior half with reticulation to reticulate laterally and punctuated medially.

Ratios. DE/DO 2.3; WH/DE 4.4; HE/MS/WM 3.6/1.0/1.9; POL/OOL/POO 6.4/1.5/1.0; WH/WT 1.1; LW/LM/ HW 1.8/1.2/1.0; PM/ST 1.3; LC/WC 4.1; WG/WC 0.6; LS/LT 0.2; LP/WP not measurable; MM/LG 0.8.

Male. Unknown.

Etymology. The specific name is in honor of the collector of the type-material of this species, Henrique F. G. Sauer (in memoriam).

Distribution. Brazil (Campinas, São Paulo State).

Hosts. Unknown.

Species identification. Using the key in Hansson (2009), females run to subkey F, couplet 28, first alternative, where this species can be distinguished from H. argus as mentioned above under diagnosis.

Figures

FIGURES 82–84. Horismenus saueri sp. nov., females, paratypes: 82, habitus, lateral view; 83, mesosoma, dorsal view; 84, head, frontal view, joining of the antennal scrobes below the frontofacial sulcus indicated by arrow. Scale bar: 82 = 500 μm; 83–84 = 100 μm.

FIGURES 85–90. Horismenus saueri sp. nov., females, paratypes: 85, head, frontal view; 86, antenna, lateral view; 87, vertex; 88, propodeum with wide anterolateral foveae and laterally rounded indicated by arrow; 89, mesosoma, dorsal view; 90, gaster, dorsal view, reticulate area on the first tergite indicated by black arrows. Scale bar: 85, 87, 89–90 = 100 μm; 86, 88 = 50 μm.