Distictus daelus Supeleto & Santos & Aguiar 2019, sp. nov.
Creators: name: Supeleto, Fernanda A.
name: Santos, Bernardo F.
name: Aguiar, Alexandre P.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Distictus
Distictus daelus

description: Distictus daelus sp. nov.
urn:lsid:zoobank.org:act: 16BAE813-3F17-4DC7-B2C1-20DBAC3041DD
Figs 10, 16E
Etymology
From the Anglo-Saxon ‘ dael ’, meaning ‘valley’; in reference to the deep sternaulus.
Material examined
Total of 2 specimens, 1 ♀ and 1 ♂.
Holotype
VENEZUELA • ♀ (pinned; in good condition); Tabay; alt. 2200 m; 30 Apr. 1981; H. Townes leg.; USUC {0}.
Paratype
VENEZUELA • 1 ♂; Yacambú; alt. 1200 m; 10 May 1981; H. Townes leg.; USUC.
Description
Female (holotype)
SIZE. Fore wing 12.25 mm long.
HEAD. Clypeus basally moderately convex, at midlength distinctly emarginated, CHW 0.46; median tubercle small, blunt, placed entirely on apical area; apical area very narrow. Mandible moderately pilose, MLW 1.19, MWW 0.46. MSM 0.73. Supra-clypeal area moderately pilose, minutely coriarious. Antenna with 30 flagellomeres. Supra-antennal area minutely but distinctly coriarious, medially with some rugae, ventrally very slightly concave, with distinct median line.
MESOSOMA. Pronotum moderately pilose, weakly striate along posterior margin and part of collar, elsewhere rugulose; epomia delicate, 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, mesoscutum 1.15 × as long as wide; notauli medially distinctly convergent, notaulus 0.45 × as long as mesoscutum; scuto-scutellar groove deep, distinctly carinulate. Mesopleuron anteriorly coriarious, posteriorly distinctly lineate; subalar ridge moderately wide, somewhat keeled; epicnemial carina distinctly sinuous, almost reaching subalar ridge; sternaulus deeply impressed, posterior 0.25 almost indistinct, with distinct vertical wrinkles; sulcus between sternaulus and scrobe distinct; mesopleural fovea a small pit, otherwise shallow; mesopleural suture weakly carinulate inside. Metapleuron rugulose, densely pilose; juxtacoxal carina vestigial. Hind coxa punctate-coriarious.
PROPODEUM. Moderately pilose; anterior margin medially very slightly concave; spiracle oval, SWL 1.46; 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 convex, arising slightly basad of 1M+Rs; crossvein 1m-cu more or less uniformly curved, distinctly longer than vein 1-Rs+M; limit between veins1m-cu and 1-Rs+M more or less traceable; fore wing vein 1-Rs+M with bulla placed near basal 0.4; vein 2Cua 1.22 × as long as crossvein 2cu-a; 3r-m spectral, distinctly shorter than 2r-m; vein 3-M about as long as 2-M; AWH 1.05, AAW 0.50; areolet 0.43 × as high as wide; APH 1.48; 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 2.27; vein Cub distinctly convex on apical half, forming straight angle with Cua; vein 2-Rs apically nebulous.
METASOMA. T1LW 1.52, T1WW 2.33; spiracle not prominent, at 0.53 of T1 length; median depression absent; lateral depression distinct; dorsolateral carina represented by blunt ridge; ventrolateral carina sharp, complete. T2LW 0.87, T2WW 1.64; thyridium about as wide as long. Tergites 2–8 coriarious; pilosity progressively denser on posterior tergites and dorsally as dense as laterally. Ovipositor straight; OST 0.87; dorsal valve scarcely punctate; ventral valve distinctly overlapping dorsal valve, its apex with 9 teeth.
COLOUR. Head, mesosoma and metasoma black and bright yellow. Head bright yellow; mandible except basal mark, malar space, supra-antennal area medially, vertex, occiput and narrow posterior portion of gena black. Mouthparts dark brown. Orbital band covering almost entire width of gena on its ventral 0.6. Antenna black; f8–9 entirely white, f7 almost entirely white, f6 and f10 dorsally mostly white; f11–30 ventrally dark brown. Mesosoma black; collar, dorsal margin of pronotum, central spot on mesoscutum, tegula, scutellum, postscutellum, subalar ridge, large central mark on mesopleuron, dorsal portion of hypoepimeron, dorsal division of metaplauron, dorsal mark covering 0.25 of metapleuron and ovoid sublateral marks on posterior area of propodeum bright yellow. Fore and mid coxae mesally black, laterally yellow; fore first trochanter dorsally blackish, ventrally yellow; mid first trochanter blackish; fore and mid trochanters, mid femur and most of fore one blackish; fore femur with anterior face yellow on apical 0.7; fore and mid tibiae deep yellow; fore and mid tarsi basally brown, blackish towards apex. Hind coxa black with moderately large dorso-basal yellow spot; hind trochanters and femur blackish; hind tibia basally dark yellow, blackish on apical 0.2; basal 0.6 of t1 brownish; apical 0.4 of t1, t2–3 and most of t4 whitish; apex of t4 and t5 blackish. Wings hyaline. Metasoma black; T1 yellow on basal 0.3 and apical 0.3; T2–3 with posterior yellow stripes, much narrower and shorter on T3; S1–6 brownish, S2–5 with narrow posterior pale yellow stripes.
Male
The only known male specimen is structurally similar to the female, but the colour pattern differs considerably. Smaller, fore wing 9.2 mm long; antennae missing; T1LW 3.21; T1WW 1.73. Metasoma mostly orange; all femora orange; metapleuron with very small and weak dorso-posterior yellow mark; mesosoma dark brown; hind tibia bright yellow, apically blackish; basal 0.6 of hind t1 orange, apical 0.4 of t1 and t2–5 whitish.
Comments
Structurally, D. daelus sp. nov. differs from all other species in the genus by having two exclusive features: sternaulus deeply impressed, except posterior 0.25 almost indistinct (Fig. 10 B–D), and pronotum weakly striate along posterior margin and part of collar, elsewhere rugulose.
The new species is most similar in colour to D. apaensis sp. nov. from which it can be differentiated by having the scutellar carina black (vs yellow); mesoscutum without lateral yellow marks (Fig. 10B) (vs with lateral yellow marks, Fig. 4B); propleuron black (Fig. 10 B–D) (vs yellow, Fig. 4B); fore femur blackish with anterior face yellow on apical 0.7 and mid femur blackish (vs fore and mid femur orange, dorsally with longitudinal blackish marks); hind tibia basally dark yellow, blackish on apical 0.2 (Fig. 10D) (vs blackish, Fig. 4C). Structurally, it differs in 62 features, of which the most important are as follows: posterior area of propodeum strigate-rugulose (vs strigate); anterior transverse carina distinctly arched forwards, somewhat bell-shaped (vs laterally approximately straight, medially slightly arched forwards); fore wing vein 3r-m distinctly shorter than 2r-m (vs about as long as 2r-m); fore wing vein 3-M about as long as 2-M (vs distinctly longer than 2-M); APH 1.48 (vs 0.97); HW1C 2.27 (vs 1.64); sternaulus deeply impressed, except posterior 0.25 almost indistinct (vs moderately deep, except posterior 0.4 almost indistinct); median depression of T1 absent (vs distinct); ventral valve of ovipositor distinctly overlapping dorsal valve (vs slightly overlapping); MLW 1.19 (vs 1.50); anterior area of propodeum coriarious-punctate (vs coriarious); median tubercle of clypeus placed entirely on apical area (vs mostly on apical area); supra-antennal area medially with some rugae (vs coriarious); scuto-scutellar groove distinctly carinulate and deep (vs weakly carinulate, shallow).
The new species is also similar in colour to D. mexicanus, from which it can be differentiated by having T4–8 entirely blackish (vs with wide posterior yellow stripes); S2–5 brownish with narrow posterior pale yellow stripes (Fig. 10D) (vs bright yellow, Fig. 11C); hind coxa black with large baso-dorsal yellow spot (Fig. 10D) (vs mostly yellow with large baso-ventral and apico-dorsal blackish marks, Fig. 11C). Structurally, it differs in 49 features, of which the most important are as follows: anterior transverse carina of propodeum distinctly arched forwards, somewhat bell-shaped (vs slightly arched forwards, medially more distinctly curved); metapleuron rugulose (vs lineate); mesoscutum and scutellum densely punctate-coriarious, matte (vs densely punctuate, shiny); pronotum weakly striate along posterior margin and part of collar, elsewhere rugulose (vs distinctly striate along collar, weakly striate along posterior margin, elsewhere sparsely punctate); APH 1.48 (vs 0.81–1.20); HW1C 2.27 (vs 1.32–1.83); hind coxa punctate-coriarious (vs moderately punctate); MLW 1.19 (vs 1.45–1.59); limit between fore wing crossvein 1m-cu and 1-Rs+M more or less traceable (vs clearly traceable); epicnemial carina distinctly sinuous (vs irregular); sternaulus deeply impressed, except posterior 0.25 almost indistinct (vs moderately deep, posterior 0.4 almost indistinct); mesopleuron anteriorly coriarious (vs mostly finely punctate); OST 0.87 (vs 0.66); mandible moderately pilose (vs sparsely pilose).
Structurally, it is most similar to D. tibialis, from which it differs by 44 features, of which the most important are as follows: anterior transverse carina of propodeum distinctly arched forwards, somewhat bell-shaped (vs slightly and uniformly arched forwards); posterior area of propodeum strigate-rugulose (vs rugulose); HW1C 2.27 (vs 1.07–1.93); fore wing vein 3r-m distinctly shorter than 2r-m and spectral (vs about as long as 2r-m, nebulous); apical area of clypeus very narrow (vs moderately long); anterior margin of propodeum medially very slightly concave (Fig. 10E) (vs medially concave, Fig. 15F); hind coxa punctate-coriarious (vs densely punctate); MLW 1.19 (vs 1.25–1.70); sternaulus deeply impressed, except posterior 0.25 almost indistinct (Fig. 10D) (vs moderately deep, posterior 0.25 shallow, Fig. 15G).
Distribution records
Venezuela.
description: Published as part of Supeleto, Fernanda A., Santos, Bernardo F. & Aguiar, Alexandre P., 2019, Revision of Distictus Townes, 1966 (Hymenoptera, Ichneumonidae, Cryptinae), with descriptions of ten new species, pp. 1-64 in European Journal of Taxonomy 542 on pages 32-35, DOI: 10.5852/ejt.2019.542, http://zenodo.org/record/3378752