Distictus commatus, Supeleto & Santos & Aguiar, 2019
Supeleto, Fernanda A., Santos, Bernardo F. & Aguiar, Alexandre P., 2019, Revision of Distictus Townes, 1966 (Hymenoptera, Ichneumonidae, Cryptinae), with descriptions of ten new species, European Journal of Taxonomy 542, pp. 1-64: 29-32
treatment provided by
Distictus commatus sp. nov.
From the Greek ‘ komma ’, in reference to the sublateral comma-shaped yellow marks on the propodeum.
Total of 1 specimen.
SIZE. Fore wing 12.62 mm long.
HEAD. Clypeus basally moderately convex, at midlength distinctly emarginated, CHW 0.50; median tubercle very small, pointed, placed entirely on apical area; apical area narrow. Mandible densely pilose, MLW 1.52, MWW 0.52. MSM 0.76. Supra-clypeal area densely pilose, minutely coriarious. Antenna with 30 flagellomeres. Supra-antennal area minutely, faintly coriarious, medially coriarious, ventrally distinctly concave, with delicate median line.
MESOSOMA. Pronotum densely pilose, weakly striate along posterior margin and collar, elsewhere minutely rugulose; epomia moderately stout, distinct and slightly sinuous only after diverging from pronotal collar, short, ending far from dorsal margin of pronotum. Mesoscutum densely covered with short hairs, densely punctate-coriarious, 1.22 × as long as wide; notauli medially distinctly convergent, 0.66 ×as long as mesoscutum; scuto-scutellar groove moderately deep, distinctly carinulate. Mesopleuron almost entirely lineate, otherwise punctate; subalar ridge moderately wide, not keeled; epicnemial carina distinctly sinuous, reaching about 0.85 of distance to subalar ridge; sternaulus moderately deep, posterior 0.25 shallow, with distinct vertical wrinkles; sulcus between sternaulus and scrobe distinct; mesopleural fovea a small pit, otherwise shallow; mesopleural suture distinctly carinulate inside. Metapleuron lineate-rugulose, densely pilose; juxtacoxal carina vestigial. Hind coxa punctate-coriarious.
PROPODEUM. Densely pilose; anterior margin medially concave; spiracle elongate, SWL 1.58; anterior area coriarious-punctate; posterior area strigate-rugulose; anterior transverse carina distinctly arched forwards, somewhat bell-shaped; posterior transverse carina represented by slight but distinct sublateral crests.
WINGS. Fore wing vein 1M+Rs anteriorly straight, posteriorly curved; crossvein 1cu-a straight but inclivous, arising slightly basad of 1M+Rs; crossvein 1m-cu irregular, distinctly longer than vein 1-Rs+M; limit between veins 1m-cu and 1-Rs+M clearly traceable; vein 1-Rs+M with bulla placed near its midlength; vein 2Cua 1.07 × as long as crossvein 2cu-a; 3r-m spectral, about as long as 2r-m; vein 3-M about as long as 2-M; AWH 0.88, AAW 0.53; areolet 0.37 × as high as wide; APH 1.38; vein 4-M nebulous, approximately straight. Hind wing with 10 hamuli; vein M+Cu apically moderately convex; vein M forming distinctly obtuse angle with Cua; HW1C 1.63; vein Cub distinctly convex at apical half, forming straight angle with Cua; vein 2-Rs apically nebulous.
METASOMA. T1LW 1.28, T1WW 2.94; spiracle slightly prominent, at 0.52 of T1 length; median depression absent; lateral depression very shallow; dorsolateral carina represented by blunt and incomplete ridge; ventrolateral carina complete but medially almost indistinct. T2LW 0.90. T2WW 1.49; thyridium distinctly wider than long. Tergites 2–8 coriarious; pilosity progressively denser on posterior tergites, laterally denser than dorsally. Ovipositor straight; OST 1.00; dorsal valve moderately punctate; ventral valve distinctly overlapping dorsal valve, apex with 8 teeth.
COLOUR. Head and mesosoma black with yellow marks; metasoma mostly reddish. Head black; basal spot on mandible, clypeus and most of supra-clypeal area, yellow. Supra-clypeal area with central triangular blackish mark. Labrum yellow, palpi dark brown. Orbital band shortly interrupted on malar space, covering entire width of gena on its ventral 0.2; f6–10 entirely white, f5 and f11 mostly white; f11–30 ventrally dark brown. Mesosoma black; collar, dorsal margin of pronotum, central spot on mesoscutum, tegula, scutellum, postscutellum, subalar ridge, central mark on mesopleuron, dorsal portion of hypoepimeron, dorsal division of metapleuron, oval mark covering 0.2 of metapleuron and elongate sublateral marks over propodeal apodeme yellow. Fore and mid coxae mesally black, laterally yellow; fore first trochanter dorsally blackish, ventrally yellow; mid first trochanter blackish; fore and mid second trochanters marked with ferruginous and blackish; fore and mid femora mostly blackish, posterior face yellow; fore and mid tibiae deep yellow; fore and mid tarsi basally yellow, blackish towards apex. Hind coxa reddish-brown, with dorso-basal yellow spot surrounded by blackish area; hind trochanters marked with brownish and blackish; hind femur brown, dorsally blackish; hind tibia deep yellow, apical 0.1 blackish; hind t1–3 deep yellow, t4–5 blackish. Wings hyaline. Metasoma reddish; T1 mostly blackish with basal and apical 0.25 yellow; T2 dorsally black, posteriorly with narrow yellow stripe. Sternites lighter than tergites.
Structurally, D. commatus sp. nov. differs from all other species in the genus by having two exclusive features: T1 ventrolateral carina complete but medially almost indistinct; and fore wing crossvein 1cu-a straight but inclivous.
The new species is similar in colour to D. ateles sp. nov., but differs in having T2 blackish with posterior yellow stripe ( Fig. 9B View Fig ) (vs reddish, with very narrow anterior blackish stripe, Fig. 7C View Fig ); hind femur blackish and dark brown (vs mostly reddish); hind tibia deep yellow, apically blackish (vs fully deep yellow), extensive yellow marks on mesosoma, matte (vs bright). Structurally, it differs in 55 features, of which the most important are as follows: posterior area of propodeum strigate-rugulose ( Fig. 9B View Fig ) (vs distinctly strigate, Fig. 7C View Fig ); anterior transverse carina distinctly arched forwards, somewhat bell-shaped (Fig. 25) (vs slightly arched forwards, medially more distinctly curved, Fig. 7C View Fig ); posterior transverse carina represented by slight but distinct sublateral crests (vs represented by only very slight sublateral crests); metapleuron lineate-rugulose (vs lineate); median tubercle of clypeus very small, pointed and placed entirely on apical area (vs large, blunt, reaching but not entirey on apical area); supra-antennal area medially coriarious (vs near ocelli rugulose, ventrally striate); hind coxa punctate-coriarious (vs punctate, dorsally sparsely, otherwise densely); mesoscutum densely punctate-coriarious (vs densely punctate); epicnemial carina distinctly sinuous, reaching about 0.85 of distance to subalar ridge (vs more or less uniformly curved and reaching about 0.70 of distance to subalar ridge); propodeum densely pilose (vs sparsely pilose).
The new species is also similar in colour to D. asterios sp. nov., from which it can be readily differentiated by having extensive yellow marks on collar and mesopleuron ( Fig. 9C View Fig ) (vs very small yellow marks, Fig. 6D View Fig ); metapleuron with distinct yellow mark ( Fig. 9C View Fig ) (vs entirely black, Fig. 6D View Fig ); hind tibia almost entirely deep yellow (vs blackish); T3 fully orange (vs with blackish marks, posteriorly with narrow yellow stripe), hind t1 entirely yellow (vs whitish, basally blackish). Structurally, it differs in 54 features, of which the most important are as follows: posterior area of propodeum strigate-rugulose (vs strigate); fore wing crossvein 1cu-a straight but inclivous (vs weakly convex); mesopleuron almost entirely lineate, otherwise punctate (vs coriarious-lineate); epicnemial carina distinctly sinuous and reaching about 0.85 of distance to subalar ridge (vs irregular, almost reaching subalar ridge); hind coxa punctate-coriarious (vs coriarious); ventrolateral carina medially almost indistinct (vs complete); thyridium distinctly wider than long (vs about as wide as long); spiracle of T1 slightly prominent (vs not prominent); T1WW 2.94 (vs 2.36); T2WW 1.49 (vs 1.96); ventral valve of ovipositor distinctly overlapping dorsal valve (vs slightly overlapping dorsal valve); T1LW 1.28 (vs 1.48).
The new species is not similar in colour but similar in structure to D. terrosus sp. nov., from which it differs in 43 structural features, of which the most important are as follows: posterior area of propodeum strigate-rugulose (vs distinctly strigate); metapleuron lineate-rugulose (vs lineate); anterior transverse carina of propodeum distinctly arched forwards, somewhat bell-shaped (vs laterally approximately straight, medially distinctly arched forwards); supra-antennal area medially coriarious (vs medially with some rugae); mesoscutum densely punctate-coriarious (vs densely punctate); supra-antennal area with delicate median line (vs with distinct median line); fore wing crossvein 1cu-a straight but inclivous (vs weakly convex); limit between fore wing crossvein 1m-cu and 1-Rs+M clearly traceable (vs 1mcu continuous with 1-Rs+M); epicnemial carina distinctly sinuous (vs irregular); ovipositor straight (vs slightly downcurved); OST 1.00 (vs 0.59–0.74); vein 2Cua 1.07 × as long as crossvein 2cu-a (vs 1.14–1.33); MLW 1.52 (vs 1.17–1.45); T2WW 1.49 (vs 1.65–1.78).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.