Eknomia rubra Santos et Aguiar, 2012

Santos, Bernardo F. & Aguiar, Alexandre P., 2012, Phylogeny and description of Eknomia, a morphologically unusual new genus of Neotropical Cryptinae (Hymenoptera, Ichneumonidae), with three new species, Zootaxa 3237 (1), pp. 35-52 : 47-48

Eknomia rubra Santos et Aguiar , sp. nov.

( Figs 5–8 , 13 )

Description. Holotype female. Fore wing 8.1 mm long. HEAD. Triangular, in front view wider than high, ventrally much narrower than dorsally. Mandible nearly impunctate, with dense and moderately long hairs; MLW 1.31, MWW 1.45; dorsal tooth pointed, not subdivided. Malar space moderately narrow, MSM 0.41. CHW 2.17, clypeus somewhat trapezoidal, CWW 1.62, basally slightly convex, apically abruptly flattened, centrally concave. Supraclypeal area medially very weakly rugulose. Antenna with 33 flagellomeres. Supra-antennal area laterally polished, medially strigulate, with very weak and incomplete median carina, ventrally slightly concave. Occipital carina only weakly raised, uniformly curved.

THORAX. Pronotum glabrate, mostly impunctate, sparsely punctate at collar, along dorsal margin of collar with horizontal striation; epomia fused with pronotal striations, distinct only after pronotal collar, weak and moderately long. Mesoscutum 1.23 × as long as wide, glabrate, scarcely punctate, median lobe medially costate; notaulus reaching about 0.67 of mesoscutum length, strongly impressed, strongly convergent; scuto-scutellar groove distinctly carinate. Mesopleuron moderately pilose, anteriorly strongly strigulate, posteriorly densely punctate; epicnemial carina reaching about 0.7 of distance to subalar ridge, weakly sinuate; sternaulus very weak at posterior 0.2, with weak oblique striation; scrobe shallow; mesopleural suture very weakly carinate along entire length. Median portion of postpectal carina very weak, moderately long, slightly arched forwards. Propodeal furrow narrow and shallow, laterally carinate, medially smooth. Metapleuron anteriorly scarcely punctate, posteriorly strigulate, its upper division strigulate; juxtacoxal carina represented by two long ridges. Hind coxa nearly impunctate.

PROPODEUM. 1.39 × as long as wide, sparsely pilose, entirely strigulate; strigulation along entire length of propodeum moderately curved posteriorwards; anterior margin medially straight, laterally without projections; SWL 2.00; posterior transverse carina entirely absent.

WINGS. Fore wing vein 1-Rs+M weakly sinuate; limit between crossvein 1m-cu and vein 1-Rs+M indistinct; vein 1M+Rs anteriorly straight, posteriorly distinctly bent towards wing base; crossvein 1cu-a arising basad 1M+Rs by 0.39 × its own length; vein 2-Cu 0.70 × as long as crossvein 2cu-a, the two veins distinctly angled; APH 0.77, cell 1+2Rs subquadrate, slightly longer than wide, AWL 0.82; crossvein 3r-m nearly fully spectral; crossveins 2r-m and 3r-m parallel, with about the same length; vein 3-M about as long as 2-M; vein 4-Rs sinuate; vein 4-M mostly nebulous, distinctly arched posteriorwards, slightly longer than 4-Rs. Hind wing vein M+Cu apically slightly convex; vein 1-Cu as long as crossvein 1cu-a, HW1C 1.00; vein Cub apical 0.5 uniformly convex; vein 2- 1A reaching about 0.8 of distance to wing margin.

METASOMA. T1 about 0.34 × as long as T2–8, slender, T1LW 3.35, apex moderately wider than base, T1WW 1.70, approximately cylindrical; sparsely pilose and very scarcely punctate; spiracle at 0.54 of its length, distinctly prominent; postpetiole without distinct depressions; dorsolateral carina entirely absent; ventrolateral carina distinct only near posterior apex. T2 moderately long, T2LW 1.60, apex moderately wider than base, T2WW 1.50; thyridium distinctly longer than wide. OST 0.70; ovipositor moderately stout, moderately punctate; apex of dorsal valve moderately pointed, nodus giving it distinctly triangular aspect, ventral valve with strong swelling, apically with 8 teeth.

Color ( Figs 5–7 ). Head and mesosoma bright orange, metasoma mostly dark brown and whitish. Head: bright orange (210, 102, 042); clypeus, mandible borders, malar space and narrow lateral line at ventral supra-antennal area, yellowish; mouthparts whitish; scape, pedicel except dorsal spot dark brown; flagellum dark brown, f6–9 dorsally white along entire length, f5 and f10 dorsally partially white. Mesosoma: uniformly bright orange; fore and mid tarsi apically blackish; hind femur dark brown, with basal orange mark which is more extensive at anterior and posterior faces; hind tibia basally dark brown, black towards apex; basal 0.4 of t1 dark brown, remainder of hind tarsus white except brownish mark at t3. Metasoma: T1 bright orange, dorsally with blackish mark just posterior to spiracle; S1 bright orange; T2–8 dark brown, with apical and lateral separated whitish marks; T2 with orange ovoid spot near thyridium; S2–6 whitish, with progressively smaller brownish lateral marks, almost indistinct at S5–6; ovipositor sheath light fuscous, ovipositor dark brown and orange.

Variation. Paratype specimen considerably larger, fore wing 13.5 mm long; clypeus and supraclypeal area with extensive yellow marks; lateral marks at supra-antennal area much wider; narrow yellow orbital band present along posterior margin of eye; mesosoma generally more densely pilose; hind t3 without brownish mark; blackish marks at T1 more extensive.

Male. Unknown.

Comments. Readily differentiated from the other two species by having the head and mesosoma almost entirely orange ( Fig. 7 ). Eknomia nigra , sp. nov. and E. propodeator , sp. nov. have the head mostly black and the mesosoma with extensive black marks. Another relevant feature is the body generally more slender: structures such as pronotum, mesoscutum, propodeum and hind coxa are distinctly longer than wide; the T1 is more slender and less triangular, T1LW 3.35, T1WW 1.70; and the ovipositor is also more slender and less distinctive, similar to that of most other Cryptinae ( Fig. 8 ).

Etymology. From the Latin ruber, meaning “red”; in reference to the mostly reddish body.

Type material. Holotype ♀ from Brazil, Amazonas, Manaus, Reserva Florestal Adolpho Ducke, 4–6.X.2005, yellow pans, APAguiar et al. ( INPA). Mounted on triangle point. In good condition . Paratype ♀ from COLOMBIA, Latecia [misspelling of Leticia], 19–25.II.1972, HHowden & MHowden ( AEIC) .

Distribution record. Amazon Basin of Brazil and Colombia ( Fig. 13 ).

Figures

FIGURE 13. Map with distribution records for Eknomia nigra, sp. nov. (circle), E. rubra, sp. nov. (square) and E. propodeator, sp. nov. (triangle).

FIGURES 5–8. Eknomia rubra, sp. nov., holotype. 5, Lateral view. 6, Head, front view. 7, Propodeum, dorsal view. 8, Ovipositor apex, lateral view.