Messatoporus tenuissimus Santos, 2013

Santos, Bernardo F. & Aguiar, Alexandre P., 2013, <strong> Phylogeny and revision of <em> Messatoporus </ em> Cushman (Hymenoptera, Ichneumonidae, Cryptinae), with descriptions of sixty five new species </ strong>, Zootaxa 3634 (1), pp. 1-284 : 184-185

Messatoporus tenuissimus Santos , sp. nov.

( Figs 99 , 230 , 364 )

Female. Fore wing 4.59 mm. HEAD: Mandible densely covered with moderately long hairs; MLW 2.21; MWW 0.42; dorsal tooth in front view projected upwards, much longer than ventral tooth; ventral tooth triangular. MSM 0.26. Clypeus basally convex, apically abruptly flattened, centrally concave; CHW 1.75; CWW 1.84; apical area medially concave, laterally slightly projected, its margin very sharp, raised. Supra-antennal area shiny, impunctate, not striate near antennal sockets, ventrally distinctly concave, without median line. Occipital carina uniformly curved, fading out at distance distinctly longer than basal width of mandible from the hypostomal carina. Temple and gena moderately wide, gena somewhat swollen and projected (as in Fig. 261 ).

THORAX: Pronotum glabrous, shiny, impunctate, not distinctly wrinkled; epomia weak, distinct only after diverging from pronotal collar, short, ending far from dorsal margin of pronotum, after diverging from pronotal collar approximately straight. Mesoscutum moderately convex, flattened posteriorly, ovoid, 1.25 × as long as wide, sparsely pilose, shiny, minutely punctulate; notaulus reaching about 0.72 of mesoscutum length, moderately impressed, surface over notaulus not wrinkled; scuto-scutellar groove shallow, without wrinkles. Subalar ridge weakly projected; epicnemial carina weak, reaching about 0.6 of distance to subalar ridge, irregular; sternaulus complete but weak, medially indistinct, weakly sinuous, with vestigial vertical wrinkles; scrobe moderately deep; mesopleural suture with weak longitudinal wrinkles along entire length. Mesosternum medially with short transverse wrinkles; median portion of posterior transverse carina of the mesothoracic venter short and almost indistinct, straight. Transverse sulcus at base of propodeum very wide, about 0.89 × as long as anterior area of propodeum, very weakly rugulose; metapleuron impunctate, covered with the same wrinkling of propodeum, however less regular, dorsally glabrate, ventrally sparsely pilose; juxtacoxal carina absent. Fore tibia distinctly swollen. Mesal lobe of t4 with 3–4 bristles. Hind coxa entirely coriarious.

PROPODEUM: 1.42 × as long as wide, shiny, sparsely pilose; anterior area scarcely punctate, medially strigulate; spiracle elliptic, SWL 2.67; anterior transverse carina medially straight. Propodeal wrinkles anteriorly very close and moderately strong, posteriorly stronger and more widely spaced, mostly complete, anteriorly almost straight, posteriorly slightly arched backwards; posterior transverse carina entirely absent.

WINGS: Fore wing vein 1-Rs+M distinctly sinuous, with bulla placed on basal 0.25; crossvein 1m-cu more or less uniformly curved, limit between 1m-cu and 1-Rs+M more or less traceable; vein 1M+Rs anteriorly straight, posteriorly weakly curved; fore wing crossvein 1 cu-a basad of 1M+Rs by 0.26 of its own length; vein 2Cua 0.41 × as long as crossvein 2cu-a; bulla of crossvein 2m-cu placed on midlength; cell 1+2Rs small, APH 0.72, pentagonal, distinctly higher than wide, AWH 0.83; crossvein 3r-m fully spectral, 2r-m and 3r-m distinctly convergent, about same length; vein 3-M about as long as 2-M; 4-Rs almost straight; 4-M tubular, irregular. Hind wing vein 1-M forming distinctly obtuse angle with vein Cua; vein 2-Rs tubular, apically spectral, reaching wing margin; HW1C 0.7; vein Cub almost straight, very slightly convex, forming straight angle with Cua; vein 2-1A reaching 0.57 of distance to posterior wing margin.

METASOMA: First tergite short, about 0.29 × as long as T2–8, somewhat depressed, ventrolaterally angled, dorsally glabrate, laterally sparsely pilose; T1LW 3.39; T1WW 1.55; spiracle on 0.43 of its length, distinctly prominent; median depression absent; lateral and median posterior depressions absent; ventrolateral carina absent, but traceable as limit between lateral and ventral portions. T2LW 1.93; T2WW 1.97; thyridium longer than wide, without small circular depression just behind it; T2–8 covered with small, shallow foveae, densely and uniformly pilose. OST 0.87; ovipositor slender, straight, basally cylindric, apically distinctly depressed; dorsal valve with four moderately strong ridges; ventral valve apex with 9 teeth, apical teeth progressively more closely spaced; surface anterior to first tooth rugulose.

Color. Head and mesosoma dark brown with whitish marks, metasoma mostly brown with whitish marks. Head: dark brown (074,054,047); clypeus, mandible except apex, mouthparts, malar space, supra-clypeal area and complete orbital band, whitish (235,220,161); scape and pedicel ventrally ferruginous (203,110,057); scape and pedicel dorsally and flagellum, brown (065,0544,040). Mesosoma: black; pronotum whitish except posterior blackish mark covering 0.4 of its surface; subcircular spot on mesoscutum, scutellum, axillar carinae, tegula, subalar ridge, ventral mark covering 0.2 of mesopleuron, dorsal division of metapleuron, metapleuron and triangular posterior mark on propodeum, whitish; fore leg basally whitish uniformly darker towards apex, fore tarsus light fuscous; fore femur dorsally pale orange with brownish stripe on basal 0.6; mid coxa whitish with apical brown mark, mid trochanters whitish with basal brown marks; mid femur ventrally whitish, dorsally pale orange with brownish stripe on basal 0.6; mid tibia whitish with ventral brown stripe; mid tarsus brown; hind coxa whitish with two basally connected longitudinal brown marks, anterior one broad and reaching basal 0.5, posterior one narrow and reaching apex of tibia; hind first trochanter basal 0.5 brown, apical 0.5 whitish; second hind trochanter brown with apical whitish mark; hind femur basal 0.1 whitish, sub-basal 0.1 and apical 0.1 brown, median 0.7 bright orange (207,105,027); basal 0.15 of hind tibia, apical 0.75 of t1 and t2–5, whitish; median 0.8 of hind tibia light brown, turning to dark brown sub-basally and apically, until basal 0.25 of t1. Metasoma: brown; T1–3 and S1–3 with posterior whitish stripes; T4 and S4 sparsely marked with whitish and brown; T5–6 with lateral whitish marks; T7 entirely whitish.

Male. Fore wing 4.37–5.35 mm long. Similar to female, except for the following: scape ventrally with whitish spot; antenna with 25 flagellomeres; f11-16 entirely white, f10 almost entirely white; pronotum with weak longitudinal wrinkles at posterior margin; brown mark on pronotum much smaller; mesosternum whitish; ventral mark on mesopleuron covering 0.4–0.6 of its surface; hypoepimeron whitish; transverse sulcus mostly whitish; mid femur pale orange except small brown spot at base; apical 0.8 of hind tibia dark brown; median depression on T1 stronger.

Comments. Somewhat similar to M. dissidens sp. nov., from which it can be differentiated mainly by body generally more slender (see Figs 99–100 ); mesopleuron with a small subcircular yellowish mark (vs. with an elongate, medium sized central mark and a small mark at hypoepimeron; metapleuron entirely yellowish (vs. about 0.4 of its surface black); first tergite short, 0.29 as longas T2–8 (vs. moderately long, 0.40 × as long as T2–8); and ovipositor dorsal valve with four moderately strong ridges (vs. without ridges).

Males of M. tenuissimus are very similar to the males of M. subalaris , in that the mesosternum and considerable portion of mesopleuron are whitish, and legs color pattern are almost identical. Males of M. tenuissimus can be distinguished by having subalar ridge whitish (vs. black); T1 dorsally black at anterior 0.75 (vs. with dorsal whitish spot at anterior 0.3); and by the color pattern of metasoma, with T4 whitish with postero-dorsal and antero-lateral brownish marks, T5–6 almost entirely dark brown and T7 almost entirely whitish (vs. T2–7 blackish with posterior whitish stripe).

Biology. Unknown.

Etymology. From the Latin tenuis, meaning “thin”, and the magnifier suffix –issimus; in reference to its very slender body.

Material examined. 1 ♀, 4 ♂♂. Holotype ♀ from ECUADOR, Sucumbios, Sacha Lodge , 270 m, 27.VIII–10.IX.1994, Malaise trap, PHibbs ( CNCI).

Paratypes: 1 ♂ from FRENCH GUYANA, Nouragues, Saut Parraré , VII.2009, Malaise trap, S.E. A.G. ( UFES) 1 ♂, same data as holotype except 4–14.III.1994 ; 1 ♂, same data except 3–16.VIII.1994 . 1 ♂ from ECUADOR, Napo, 12 km W Tena , 500 m, 8–11.VII.1976, SPeck & JPeck ( CNCI) .

Distribution. Recorded only from the type locality, in eastern Ecuador ( Fig. 364 ).

Figures

FIGURES 96–100. Lateral view. 96, M. bennetti*. 97, M. bimaculatus*. 98, M. unimaculatus*. 99, M. tenuissimus*. 100, M. disidens*.

FIGURES 230–235. Hind leg. 230, M. tenuissimus*. 231, M. variegatus. 232, M. unimaculatus*. 233, M. caxiuanensis*. 234, M. bimaculatus*. 235, M. tibiator.

FIGURES 361–368. Distribution maps for species of Messatoporus. 361, M. semiaurantigaster. 362, M. subalaris. 363, M. tenuiorbis. 364, M. tenuissimus. 365, M. terebrator. 366, M. teutonicus. 367, M. tibiator. 368, M. titans.

FIGURES 260–271. 260–261, Gena, lateral. 260, M. longicaudis*. 261, M. compressicornis. 262–264, Antenna. 262, M. tibiator. 263, M. compresscornis. 264, M. antennator, male. 265–266, Hind t4. 265, M. paeneater*. 266, M. nigriscutus*. 267–271, Metasoma and ovipositor. 267, M. opacus*. 268, M. discoidalis. 269, M. longicaudis*. 270, M. convexus. 271, M. townesi.