Loxopus tenuis Santos et Aguiar, 2014

Santos, Bernardo F. & Aguiar, Alexandre P., 2014, Review of Loxopus Townes (Hymenoptera, Ichneumonidae, Cryptinae), with descriptions of six new species, Journal of Natural History 49 (31), pp. 1905-1935 : 1930-1932

Loxopus tenuis Santos et Aguiar , sp. nov. (Figures 4C, 6C, 8G)

Female

Fore wing 3.97 mm long. Head. Antenna with 22 flagellomeres. CWH 1.58; CWW 1.48. MLW 1.53; MWW 0.54. MSM 0.47. Median line on supra-antennal area faint, almost indistinct. Mesosoma . Pronotum with weak, short striae along posterior margin of collar, from laterocentral area to ventral corner. Scutellar carina in lateral view distinct over full length of scutellum, though much weaker at posterior 0.5. Subalar ridge very narrow, dash-like; epicnemial carina restricted to ventral 0.7 of mesopleuron, its ventral 0.3 arched forward, dorsally almost straight. Transverse furrow at base of propodeum with distinct striae. Metapleuron finely punctate; juxtacoxal and pleural carinae absent. Fourth tarsomeres lateral lobe 5.0 × as long as mesal lobe, mesal lobe almost indistinct. Anterior margin of propodeum medially weakly concave; SWL 1.63; posterior transverse carina medially interrupted, sublaterally forming delicate crests. Fore wing vein 1-Rs + M and crossvein 1m-cu approximately straight and with same length; crossvein 1cu-a arising opposite to base of 1M + Rs; veins 2cu-a and 2-Cu aligned; bulla of crossvein 2m-cu placed centrally; APH 0.49; AWH 0.94. Hind wing vein 2-1A absent or vestigial; HW1C 1.49. Metasoma. T1LW 2.40; T1WW 2.04; T1 angled ventrolaterally; dorsolateral carina complete but weak, stronger posteriorly; ventrolateral carina absent. T2LW 0.95; T2WW 2.20; T2–8 sparsely pilose, finely punctate. OST 0.75; ovipositor approximately straight; dorsal valve with delicate nodus, preapical notch present but very weak, ventral valve tip with five very weak, oblique ridges ( Figure 6C ).

Colour. Head black, mesosoma and legs ferruginous, metasoma dark brown and white. Head: black; scape ferruginous (173,122,068); pedicel with elongate white spot, remainder of pedicel and first flagellomere ferruginous to light brown, darker toward apex; dorsal portion of apex of 4, 5–9 and base of 10 white; clypeus and ventral portion of supra-clypeal area light ferruginous; dorsal portion of supraclypeal area, mouthparts, base of mandible and malar space, orbital band on supra-antennal area and vertex, whitish (225,207,164); apex of mandible blackish; gena dark ferruginous. Mesosoma : ferruginous (164,100,046); propleuron, collar, metapleuron near hind coxa, small transverse marks over propodeal crests whitish. Legs: ferruginous, generally darker towards apex; fore and mid coxae and trochanter white; hind coxa with fore portion ferruginous, hind portion white, lateral part with a broad brown mark, darker towards apex; hind trochanter whitish, hind trochantellus brownish. Wings hyaline, fore wings with buff, pale darker spot covering the apical part of cells 2 + 3M and 1 + 2R. Metasoma: T1 light ferruginous, apical 0.5 white; T2 dark brown, apical 0.3 pale or whitish; T3 whitish, T4–6 dorsally dark brown, laterally ferruginous; T7–8 dorsally whitish, laterally ferruginous; ovipositor reddish orange (166,106,059); sheath dark brown.

Male

Unknown.

Variation

Fore wing 3.38–397 mm long. Antenna with 20–23 flagellomeres; posterior transverse carina of propodeum sometimes traceable medially, but usually interrupted; general tone of ferruginous can vary from bright, almost orange, to very pale, straw-coloured; supra-clypeal area rarely with faint fuscous lateral marks; T2 sometimes medially brown, only laterally whitish; T3 sometimes with basal subcircular dark spot; T3–6 sometimes laterally white.

Comments

Very similar to L. duckei , from which it can be differentiated by having the supraclypeal area entirely whitish, rarely with fuscous lateral marks (versus with distinct brownish marks); posterior transverse carina of propodeum usually incomplete (versus complete) anterior portion of T1 orange (versus blackish); T3 anteriorly entirely white (versus blackish); dorsal valve of ovipositor with a delicate nodus (versus without nodus); and ventral valve with five teeth (versus eight). In addition, some specimens of L. duckei have a hind wing vein 2-1A.

Etymology

From the Latin tenuis , meaning thin, slender; in reference to its generally small and delicate structure.

Material examined

19 ♀♀. Holotype ♀ from BRAZIL, Pará, Melgaço, Floresta Nacional de Caxiuanã, Igarapé Curua , P05020, 14–17 November 2003, yellow pan traps, APAguiar and JDias ( MPEG). Mounted on triangle point. In good shape.

Paratypes: BRAZIL: Amazonas : 1 ♀ from Manaus, Reserva Adolpho Ducke, Pt. 16, 2–4 October 2005 , yellow pan traps, A.P. Aguiar et al. ( INPA). Pará : 1 ♀ from Melgaço, Floresta Nacional de Caxiuanã, Estação Científica Ferreira Pena , P05014, 13–16 November 2003 , yellow pan traps, A.P. Aguiar & J. Dias; 1 ♀♀, same data except P05024, Igarapé Ararua , 15–18 November 2003 ; 1 ♀, same data except P05025 ; 1 ♀, same data except P05071, 18–21 November 2003 ; 1 ♀, same data except P05184, 24–27 November 2003 ; 1 ♀, same data except Igarapé Curua , P05020, 14–17 November 2003 ; 2 ♀♀, same data except P05021 ; 1 ♀, same data except P05065, 17– 20 November 2003 ; 1 ♀, same data except P05111, 20–23 November 2003 ; 1 ♀, same data except P05114 ; 1 ♀, same data except P-5174, 23–26 November 2003 ; 1 ♀, same data except Igarapé Tijucaquara , P05081, 18–21 November 2003 ; 1 ♀, same data except P05086 ; 1 ♀, same data except P05087 ; 1 ♀, same data except P05088 ; 1 ♀, same data except P05137, 21–24 November 2003 ( MPEG).

Distribution

Brazil (AM, PA) ( Figure 8G).

Figures

Figure 6. Ovipositor apex. (A) L. ichilus. (B) L. multicolor; (C) L. tenuis; (D) L. venezuelanus.