Horismenus crastoensis 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 : 43-46

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

Figs 31–39

Type material. Holotype ♀ point mounted, with label “ BRASIL, SE [Sergipe], Sta. [Santa] Luzia do Itanhy, Crasto , 11º22’30,4”S 37º24’56,3”W, Arm. Malaise—Bosque 3, 29.vii–01.viii.2001, MT Tavares e eq., col.” (deposited in MZUSP).

Type condition. Holotype with left wing damaged and right flagellum glued separately on the point.

Diagnosis. Area just above the frontofacial area and upper frons with strong raised reticulation ( Fig. 34 ); vertex with strong raised reticulation and without median groove ( Fig. 36 ); mesoscutum with posterior half of midlobe forming a triangle ( Fig. 38 ); mesoscutellum with strong raised reticulation, with a very weak median groove and without lateral mesh-rows ( Fig. 38 ); fore and hind coxae dark with metallic shine, mid coxae paler without metallic tinges ( Fig. 31 ); head triangular in lateral view.

Description. Female. Length of body 2.5 mm.

Color. Scape yellowish white, pedicel and flagellum brown with metallic tinges ( Fig. 31 ). Frons and vertex bluish green with metallic gold tinges, occipital margin black with metallic tinges ( Fig. 33 ). Pronotal collar black with metallic bluish green tinges ( Fig. 32 ). Mesoscutum black with metallic tinges ( Fig. 32 ). Mesoscutellum black with metallic tinges, with a narrow middle band and lateral and posterior margins with metallic blue tinges ( Fig. 32 ).Axillae black with metallic tinges, anterior one-quarter with metallic bluish green tinges ( Fig. 32 ). Propodeum metallic bluish green with golden tinges on smooth parts ( Fig. 32 ). Fore and hind coxae brown with metallic tinges, mid coxae pale brown; femora yellowish brown, tibiae and tarsi yellowish white ( Fig. 31 ). Wings hyaline. Petiole black. Gaster with first tergite dark brown with anterior two-thirds with metallic bluish green tinges; remaining tergites dark brown.

Head.Antennae as in Fig. 35 . Frons ( Fig. 34 ) with clypeal and interscrobal surface with weak raised reticulation, remaining parts with strong raised reticulations; frontofacial sulcus V-shaped, incomplete and not reaching eyes; antennal scrobes joining frontofacial sulcus separately. Malar sulcus absent. Vertex ( Fig. 36 ) with strong raised reticulation; median groove absent. Occipital margin rounded.

Mesosoma. Mesoscutum ( Fig. 38 ) with strong raised reticulation; notauli present as triangular impressions posteriorly, forming the posterior half of the midlobe to a triangle. Mesoscutellum ( Fig. 38 ) with strong raised reticulation, lateral and posterior margins smooth and shiny; median groove weak, not reaching the posterior half of scutellum. Metascutellum convex, smooth and shiny, with two wide foveae anteriorly. Propodeum ( Fig. 37 ) with strong raised reticulation, including the anterolateral foveae; lateral propodeum with weak reticulation smooth and shiny, median carina and submedian grooves with strong raised reticulation that becomes weaker in anterior one-third; propodeal callus with 4 setae. Coxae with weak reticulation. Fore wing with speculum open posteriorly; number of admarginal setae asymmetrical on the only specimen available, with 23 admarginal setae in left wing and 18 in right wing, plus one seta near stigmal vein; costal cell bare.

Metasoma. Gaster with first tergite with a wide reticulate band near posterior margin, remaining tergites smooth and shiny ( Fig. 39 ).

Ratios. DE/DO 5.4; WH/DE 2.1; HE/MS/WM 3.3/1.0/1.4; POL/OOL/POO 2.8/1.3/1.0; WH/WT 1.2; LW/LM/ HW 1.8/1.3/1.0; PM/ST 1.4; LC/WC and WG/WC not measured; LS/LT 0.4; LP/WP 0.7; MM/LG 0.6.

Male. Unknown.

Etymology. The specific name given in reference to the type locality, Crasto (Atlantic Forest reserve) in the municipality of Santa Luzia do Itanhy, Sergipe state, Brazil.

Distribution. Brazil (Crasto Atlantic Forest reserve in Santa Luzia do Itanhy, Sergipe State).

Hosts. Unknown.

Species identification. Specimens can be identified using the key in Hansson (2009) as modified below. Females run to subkey D, couplet 3, where the second alternative leads to couplet 4, which is modified as follows:

4a. Fore and mid coxae with different color ( Fig. 31 )................................. Horismenus crastoensis sp. nov. - Fore and mid coxae with the same color................................................................... 4

Figures

FIGURES 31–33. Horismenus crastoensis sp. nov., female, holotype: 31, habitus, lateral view; 32, mesosoma, dorsal view; 33, head, frontal view. Scale bar: 31 = 500 μm; 32–33 = 100 μm.

FIGURES 34–39. Horismenus crastoensis sp. nov., females, holotype: 34, head, frontal view; 35, antenna, lateral view; 36, vertex; 37, propodeum; 38, mesosoma, dorsal view; 39, gaster, dorsal view, reticulate band near posterior margin of first tergite indicated by black arrow. Scale bar: 34–38 = 100 μm; 39 = 200 μm.