Horismenus amplicavus 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 : 35-38

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

Figs 2–11

Type material. Holotype ♀ point mounted, with label “CAF—Dionísio MG [Minas Gerais], Br. [ Brasil] 06a20/ II/90, W.G. de Campos ”, “Armad. Malaise, E [ucalyptus]. cloeziana, Área: B.1” (deposited in MZUSP) . Paratype. 1♀, “SP 22”. “CAF—Dionísio MG [Minas Gerais], Br. [ Brasil] 23/I a 06/II/90, W.G. de Campos ”, “Armad. Malaise, E [ucalyptus]. cloeziana, Área: B.1” (deposited in MZUSP) .

Type condition. Female holotype glued directly on a point; femur, tibia and left anterior tarsus missing. Paratype damaged, missing the left hind wing, left flagellum and part of the right flagellum, missing all legs except for the coxae and the left femur on hind leg.

Diagnosis. Upper frons ( Fig. 6 ) and vertex with strong raised reticulation; malar sulcus present; mesoscutum metallic dark blue ( Fig. 3 ) and with strong raised reticulation ( Fig. 10 ); mesoscutellum metallic black ( Fig. 3 ) and weakly reticulated ( Fig. 10 ); propodeum with strong raised reticulation and wide anterolateral foveae reaching plicae ( Fig. 9 ); hind tibial spur short, LS/LT = 0.2; petiole short, LP/WP = 0.8; gaster rounded ( Fig. 11 ).

Description. Female. Length of body 1.4–1.6 mm.

Color. Scape yellowish white, pedicel and flagellum dark brown with metallic tinges. Frons metallic dark blue, vertex metallic dark bluish green to metallic golden green ( Fig. 4 ). Mesoscutum metallic dark blue ( Fig. 3 ). Mesoscutellum black with metallic tinges, lateral and posterior margins metallic dark blue ( Fig. 3 ). Propodeum metallic dark blue with metallic gold green tinges on the median carina and lateral area of propodeum ( Fig. 3 ). Coxae metallic dark blue; femora yellowish brown, tibiae and tarsi yellowish white ( Fig. 2 ). Wings hyaline. Petiole black. Gaster with the first tergite black with metallic tinges, anterior third with metallic bluish green tinges; following tergites black.

Head. Antennae ( Fig. 7 ). Frons with strong raised reticulation, interscrobal surface with weak raised reticulation; frontofacial sulcus V-shaped, incomplete, and not reaching the eyes; antennal scrobes joining frontofacial sulcus separately. Malar sulcus present. Vertex ( Fig. 8 ) with strong raised reticulation; median groove present in posterior part. Occipital margin rounded.

Mesosoma. Mesoscutum ( Fig. 10 ) with strong raised reticulation; notauli medially distinct, anteriorly as very weak narrow lines. Mesoscutellum ( Fig. 10 ) with weak to very weak raised reticulation; median groove not reaching posterior margin. Metascutellum convex, smooth, and shiny, anteriorly with two narrow foveae. Propodeum ( Fig. 9 ) with strong raised reticulation, anterior two-thirds of median carina and lateral propodeum with raised weak to very weak reticulation; anterolateral foveae large, reaching plicae; propodeal callus with 2 setae. Coxae with weak reticulation. Fore wing with speculum completely open ( Fig. 5 ); with 13–14 admarginal setae; costal cell bare.

Metasoma. Gaster rounded ( Fig. 11 ), with first tergite smooth and shiny with a band of reticulation near posterior margin, weakened medially.

Ratios. DE/DO 5.8; WH/DE 2.0; HE/MS/WM 2.5/1.0/1.6; POL/OOL/POO 3.2/1.2/1.0; WH/WT 0.9; LW/LM/ HW 1.8/1.1/1.0; PM/ST 1.0; LC/WC 4.0; WG/WC 1.5; LS/LT 0.2; LP/WP 0.8; MM/LG 0.9.

Male. Unknown.

Etymology. Specific name from the Latin amplus = large, and cavus = depression, in reference to the wide anterolateral fovea on female propodeum.

Distribution. Brazil (Dionísio, Minas Gerais State).

Hosts. Unknown.

Species identification. Using the key in Hansson (2009), females run to subkey D, couplet 11, where the second alternative leads to couplet 13, which is modified as:

13a. Petiole short, 0.8x as long as wide; hind tibial spur short, LS/LT = 0.2.................. Horismenus amplicavus sp. nov. - Petiole long, at least 0.9X as long as wide; hind tibial spur long, LS/LT ≥ 0.3..................................... 13

Figures

FIGURES 2–5. Horismenus amplicavus sp. nov., female:2, habitus, lateral view, holotype; 3, mesosoma, dorsal view, paratype; 4, head, frontal view, holotype; 5, Fore wing base with speculum open, paratype. Scale bar: 2 = 500 μm; 3–5 = 100 μm.

FIGURES 6–11. Horismenus amplicavus sp. nov., females: 6, head, frontal view, holotype; 7, antenna, lateral view, holotype; 8, vertex, median groove indicated by black arrow, paratype; 9, propodeum with anterolateral foveae reaching plicae (black arrow), paratype; 10, mesosoma, dorsal view, paratype; 11, gaster, dorsal view, paratype. Scale bar: 6, 8, 10–11 = 100 μm; 7, 9 = 50 μm.