Idiasta rupina, Oliveira & Penteado-Dias, 2020

Oliveira, Francielle Dias de & Penteado-Dias, Angelica Maria, 2020, An update of the genera Idiasta Foerster and Rhacalysia Cameron (Hymenoptera, Braconidae, Alysiinae) and the descriptions of new species from the Neotropical Region, ZooKeys 976, pp. 109-130 : 109

Idiasta rupina sp. nov. Figures 1-7

Type material.

Holotype pinned, female, (DCBU 404791) Brazil, Minas Gerais, São Roque de Minas, Parque Nacional da Serra da Canastra, 20°15'15.29"S, 46°25'14.38"W, alt. 1317 m, 05-07.I.2019, rupestrian grassland, Moericke traps, A. S. Soares col. Paratype, male, (DCBU 404792) same data as holotype.

Diagnosis.

Idiasta rupina is distinct from other Neotropical species in having the eyes glabrous, notauli incomplete, metanotum with high median flange, m-cu of fore wing interstitial, and fore wing cu-a postfurcal.

Description.

Female (holotype) (Fig. 1 ). Length. Body 2.65 mm; fore wing 2.7 mm; hind wing 1.9 mm.

Head. 1.6 × as wide as long; 1.8 × as wide as face, 1.6 × as wide as mesosoma, 3.3 × as wide as apex of first metasomal tergite; slightly wider at eyes than temples in dorsal view. Eye glabrous, 1.2 × as high as wide, 2.6 × as wide as temple in lateral view (Fig. 2 ). Occiput, vertex, frons and temples smooth, with some sparse setae. Face 1.7 × as wide as high, setose; slightly rugulose above clypeus (Figs 3 , 4 ). Epistomal sulcus well defined but almost shallow, slightly rugulose. Clypeus protruding, smooth, setose, 1.5 × as wide as high; lateral margin of clypeus in contact with paraclypeal fovea (Fig. 3 ). Malar space ca. 1/10 eye height. Paraclypeal fovea occupying 2/7 of distance between lateral margin of clypeus to eye. Mandible 3-dentate (Fig. 4 ), 1.9 × as long as apical width, slightly wider in apex than base; setose, rugulose antero-medially, punctate; diagonal ridge well developed on apical half of mandible, ventral ridge complete; teeth 1 and 2 connected by flange, incision present but unobtrusive; teeth 1 and 3 approximately equal in size, tooth 2 wider and longer than others. Antenna 1.8 × as long as body, with 32 flagellar segments. First flagellar segment 3.3 × as long as wide; second flagellar segment 8.2 × as long as wide, 2.5 × length of first segment; third flagellar segment 6.5 × as long as wide, 1.8 × length of first. Maxillary palp 1.7 × as long as head height.

Mesosoma. 1.4 × as long as high, 1.9 × as long as wide, 1.7 × as high as head. Pronotum in dorsal view with small but distinct pronope, crenulate in posterior margin; in lateral view, crenulate in upper middle area. Mesoscutum 1.1 × as wide as long, scattered setae present along notauli. Notauli deep, crenulate anteriorly, absent posteriorly. Mesoscutal pit deep, slightly elongate, occupying a little less than 1/5 extent of mesoscutum. Scutellar sulcus 2.5 × as wider as long, with well-developed mid ridge and some weak ridges at posterior margin of lateral areas. Scutellar disc smooth, setiferous; parascutellar area weakly rugulose posteriorly, with setae near scutellar sulcus. Metanotum setiferous anteriorly, in dorsal view rugose medially, depressed lateral fields crenulate; mid ridge complete and two well-developed median lateral ridges; metanotum in lateral view with high median flange. Mesopleuron with scattered setae in ventral area, antero-basal margin crenulate towards anterior subalar area; posterior margin crenulate. Precoxal sulcus deep, long, widely crenulate, separated from posterior margin (Fig. 5 ). Propodeum with anterior half nearly smooth and median carina; posterior half rugose, including inside areola; areola pentagonal, ca. as long as wide. Metapleuron rugose (except medially) and setose.

Fore wing. Approximately as long as body. Pterostigma 3.4 × as long as wide, 2.25 × as wide as vein r length; r 0.3 × as long as 2-SR, arising distad midpoint of pterostigma; submarginal cell 2.6 × as long as high; 2-SR 2.5 × as long as r-m, 1.4 × as long as 3-SR; 3-SR 2.65 × as long as r, 1.8 × as long as r-m; SR1 5.15 × as long as 3-SR; 2-CU1 1.1 × as long as m-cu, this interstitial; cu-a postfurcal by distance less than its length; subdiscal cell closed, nearly parallel-sided; CU1a arising slightly above middle of subdiscal cell (Fig. 6 ).

Hind wing. With three hamuli, 5.7 × as long as wide; vein 1-M 1.15 × as long as M+CU, 2.0 × as long as 1r-m; m-cu interstitial, spectral (Fig. 7 ).

Legs. Hind femur 6.35 × as long as wide. Hind tibia 11.2 × as long as its maximum subapical width, 0.9 × as long as hind tarsus. First segment of hind tarsus 1.7 × as long as second segment.

Metasoma. First metasomal tergite 1.6 × as long as apical width; apex 1.5 × as wide as base; strongly strigose surface, dorsal carinae convergent and uniting in basal third, continuing as a distinct median carina to apex, dorsope deep. Ovipositor 1.3 × as long as hind tibia, 1.45 × as long as mesosoma; straight and strongly directed upwards (Fig. 1 ). Ovipositor sheath setose.

Color. Dark brown to black. Gena and mandibles brown, mandibles lighter in apical third; scape, pedicel, and basal half of first flagellar segment yellow brown; flagellar segments 2-13 brown, 14-19 white, 20-32 dark brown. Propleuron, ventral mesopleuron, and tegulae brown. Second and third metasomal tergites brownish yellow. Legs yellow, gradually darkening towards apex; coxa and trochanter pale yellow; hind tibia and hind tarsus brown. Wings hyaline, venation and pterostigma brown.

Male. Similar to female but body length 2.4 mm; hind wing 2.0 mm; head 3.0 × as wide as apex of first metasomal tergite; antenna with 36 flagellar segments; first flagellar segment 3.9 × as long as wide; second flagellar segment 7.95 × as long as wide, 1.8 × length of first segment; third flagellar segment 7.0 × as long as wide, 1.4 × length of first segment; maxillary palp 2.4 × as long as head height. Mesoscutum slightly longer than wide; scutellar sulcus 2.25 × as wide as long. Fore wing with 2-SR vein 1.9 × as long as r-m, 1.6 × as long as 3-SR; 3-SR 1.2 × as long as r-m. Hind wing 1-M 0.8 × as long as M+CU, 2.6 × as long as 1r-m. Hind femur 5.15 × as long as wide; first segment of hind tarsus 1.5 × as long as second segment. Antenna brown except yellowish basal half of first flagellar segment; wing venation and pterostigma light brown.

Etymology.

The species name refers to the ecosystem from which the studied material was collected.

Distribution.

Brazil, State of Minas Gerais, São Roque de Minas, rupestrian grassland.

Comments.

Idiasta rupina and I. dixi are related Neotropical species and share the notauli absent posteriorly, fore wing cu-a postfurcal, and hind wing m-cu not tubular. The color pattern of the body is also similar. However, Idiasta rupina can be differentiated by the glabrous eye (with sparse setae in I. dixi ), high median flange of the metanotum (absent in I. dixi ), fore wing m-cu interstitial (slightly antefurcal in I. dixi ). Additionally, Idiasta rupina differ in the following quantitative ratios: eye 2.5 × as wide as temple (3.1 × in I. dixi ); maxillary palp ca. twice as long as head height (1.4 × in I. dixi ); sulcus scutellar 2.5 × as wide as long (1.4 × in I. dixi ); fore wing vein 3-SR 2.6 × as long as r (3.5 × in I. dixi ); SR1 5.1 × as long as 3-SR (4.5 × in I. dixi ); ovipositor 1.4 × as long as mesosoma (ca. 1.0 × in I. dixi ).

Figures

Figures 1 - 7. Idiasta rupina sp. nov. (1, 2, 5 - 7 female, holotype 3 and 4 male, paratype) 1 habitus, lateral view 2 head, lateral view 3 head, anterior view 4 head, lateral view showing mandible 5 mesosoma, lateral view 6 fore wing 7 hind wing.