Distictus asterios, 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: 19-21

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scientific name

Distictus asterios

sp. nov.

Distictus asterios   sp. nov.


Figs 6 View Fig , 16E View Fig


From the Latin ‘ asterios   ’, meaning ‘starry’, in reference to the multiple small yellow spots on a black background.

Material examined

Total of 1 specimen.


ECUADOR • ♀ (pinned; left flagellum and apical half of right antenna missing; dirty; otherwise in good condition); Baños, Runtun; Oct. 1968; L. Peña leg.; USUC {0}.  


Female (holotype)

SIZE. Fore wing 10.80 mm long.

HEAD. Clypeus basally moderately convex, at midlength distinctly emarginated, CHW 0.44; median tubercle small, pointed, placed entirely on apical area; apical area very narrow. Mandible densely pilose, MLW 1.43, MWW 0.50. MSM 0.86. Supra-clypeal area densely pilose, minutely coriarious. Antenna missing. Supra-antennal area minutely but distinctly coriarious, medially coriarious, ventrally and around ocelli distinctly concave, with distinct median line.

MESOSOMA. Pronotum densely pilose, weakly striate along posterior margin and collar, elsewhere minutely coriarious; epomia delicate, distinct and slightly curved only after diverging from pronotal collar, short, ending far from dorsal margin of pronotum. Mesoscutum densely covered with short hairs, coriarious, 1.19 × as long as wide; notauli medially distinctly convergent, apex destroyed by pin; scuto-scutellar groove moderately deep, distinctly carinulate. Mesopleuron coriarious-lineate, otherwise coriarious; subalar ridge narrow, elongate, not keeled; epicnemial carina irregular, almost reaching subalar ridge; sternaulus moderately deep, posterior 0.25 shallow, with distinct vertical wrinkles; sulcus between sternaulus and scrobe almost indistinct; mesopleural fovea a small pit, otherwise shallow; mesopleural suture distinctly carinulate inside. Metapleuron lineate-rugulose, densely pilose; juxtacoxal carina vestigial. Hind coxa coriarious.

PROPODEUM. Densely pilose; anterior margin medially very slightly concave; spiracle oval, SWL 1.40; anterior area coriarious; posterior area strigate; anterior transverse carina slightly arched forwards, medially more distinctly curved; posterior transverse carina represented by slight but distinct sublateral crests.

WINGS. Fore wing vein 1M+Rs anteriorly straight, posteriorly curved; crossvein 1cu-a weakly convex, arising slightly basad of 1M+Rs; crossvein 1m-cu irregular, continuous with 1-Rs+M; vein 1-Rs+M with bulla placed near its midlength; vein 2Cua 1.33 × as long as crossvein 2cu-a; 3r-m partially spectral, about as long as 2r-m; vein 3-M distinctly longer than 2-M; AWH 1.01, AAW 0.28; areolet 0.36 × as high as wide; APH 1.29; vein 4-M nebulous, approximately straight. Hind wing with 8 hamuli; vein M+Cu apically moderately convex; vein M forming distinctly obtuse angle with Cua; HW1C 1.67; vein Cub straight, forming straight angle with Cua, vein 2-Rs apically nebulous.

METASOMA. T1LW 1.48, T1WW 2.36, spiracle not prominent, at 0.51 of T1 length; median depression distinct; lateral depression distinct; dorsolateral carina represented by blunt ridge; ventrolateral carina sharp, complete. T2LW 0.87, T2WW 1.96; thyridium about as wide as long. Tergites 2–8 coriarious; pilosity progressively denser on posterior tergites and laterally denser than dorsally. Ovipositor straight; OST 0.78; dorsal valve moderately punctate; ventral valve slightly overlapping dorsal valve, its apex with 8 teeth.

COLOUR. Head and mesosoma black with yellow marks; metasoma orange with black and yellow marks. Head black; small spots on base of mandible and center of clypeus, light yellow. Mouthparts dark brown. Orbital band briefly interrupted on malar space, distinctly wider on supra-clypeal area and ventral portion of gena, but never covering entire width of gena. White band on flagellum starting with small apical mark on f4. Mesosoma black; small marks on dorsal and ventral portions of collar, narrow mark on dorsal margin of pronotum, central spot on mesoscutum, part of tegula, scutellum, part of postscutellum, subalar ridge, small central mark on mesopleuron, dorsal portion of hypoepimeron, most of dorsal division of metapleuron, and small sublateral marks on posterior area of propodeum light yellow. All coxae black with small yellow spots, on mid coxa proportionally larger, on hind coxa placed dorso-basally; all first trochanters marked with orange and blackish; all second trochanters orange; fore and mid femora orange with dorsal dark marks, on mid femora a distinct blackish stripe; fore and mid tibiae deep yellow; fore and mid tarsi basally yellow, blackish towards apex; hind femur and tibia blackish, except apex of femur and base of tibia orange; basal 0.4 of t1, most of t4 and t5 blackish; apical 0.6 of t1, t2–3 and part of t4 white. Wings hyaline. Metasoma T1 dark brown, laterally partially light brown, posterior 0.2 yellow; T2 blackish, dorsally with posterior yellow stripe; T3–8 orange, T3 slightly infuscate with blackish marks and with narrow posterior yellow mark. Sternites orange.




Structurally, D. asterios   sp. nov. differs from all other species in the genus by having three exclusive features: hind coxa coriarious; fore wing vein 3r-m partially spectral; supra-antennal area ventrally and around ocelli distinctly concave. In colour, it is unique by having very small yellow marks on the collar and mesopleuron ( Fig. 6D View Fig ).

The new species is most similar in colour to D. commatus   sp. nov., from which it can be readily differentiated by having very small yellow marks on the mesosoma (vs extensive yellow marks); metapleuron entirely black (vs with distinct yellow mark); hind tibia blackish (vs almost entirely deep yellow); T3 orange, slightly infuscate with blackish marks and with narrow posterior yellow stripe (vs fully orange and without posterior yellow stripe); hind t1 whitish, basally blackish (vs entirely yellow). Structurally, it differs in 54 features, of which the most important are as follows: posterior area of propodeum strigate (vs strigate-rugulose); fore wing crossvein 1cu-a weakly convex (vs straight but inclivous); mesopleuron coriarious-lineate (vs almost entirely lineate, otherwise punctate); epicnemial carina irregular, almost reaching subalar ridge (vs distinctly sinuous, reaching about 0.85 of distance to subalar ridge); hind coxa coriarious (vs punctate-coriarious); ventrolateral carina complete (vs complete but medially almost indistinct); thyridium about as wide as long (vs distinctly wider than long); spiracle of T1 not prominent (vs slightly prominent); T1WW 2.38–2.60 (vs 2.94); T2WW 1.83–1.86 (vs 1.49); ventral valve slightly overlapping dorsal valve (vs distinctly overlapping dorsal valve); T1LW 1.50–1.86 (vs 1.28).

The new species is structurally most similar to D. tibialis   , from which can be separated by 43 features, of which the most important are as follows: posterior area of propodeum strigate (vs rugulose); anterior transverse carina distinctly arched forwards (vs slightly and uniformly arched forwards); pronotum weakly striate along posterior margin and collar (vs distinctly striate); mesoscutum coriarious (vs punctate-coriarious); apical area of clypeus very narrow (vs moderately long); fore wing crossvein 1cu- a weakly convex (vs convex); subalar ridge narrow, elongate (vs moderately wide).

Distribution records