Distictus apaensis, 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: 12-15
treatment provided by
Distictus apaensis sp. nov.
The specific epithet is a reference to the Apa Apa Ecological Reserve, where the holotype was collected.
Total of 1 specimen.
SIZE. Fore wing 9.88 mm long.
HEAD. Clypeus basally moderately convex, at midlength not distinctly emarginated, CHW 0.52; median tubercle small, blunt, placed moslty on apical area; apical area narrow. Mandible sparsely pilose, MLW 1.50, MWW 0.50. MSM 0.89. Supra-clypeal area densely pilose, minutely coriarious. Antenna with 28 flagellomeres. Supra-antennal area minutely but distinctly coriarious, medially coriarious, ventrally very slightly concave, dorsally with distinct median line, ventrally fading.
MESOSOMA. Pronotum moderately pilose, weakly striate along posterior margin and collar, elsewhere minutely coriarious; epomia delicate, distinct and approximately straight only after diverging from pronotal collar, moderately long, ending near dorsal margin of pronotum. Mesoscutum densely covered with short hairs, coriarious, 1.16 × as long as wide; notauli medially distinctly convergent, 0.56 × as long as mesoscutum; scuto-scutellar groove shallow, weakly carinulate. Mesopleuron almost entirely lineate, otherwise punctate; subalar ridge moderately wide, not keeled; epicnemial carina irregular, almost reaching subalar ridge; sternaulus moderately deep, posterior 0.4 almost indistinct, with weak 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. Densely pilose; anterior margin medially concave; spiracle oval, SWL 1.33; anterior area coriarious; posterior area strigate; anterior transverse carina laterally approximately straight, medially slightly arched forwards; posterior transverse carina represented by slight but distinct sublateral crests.
WINGS. Fore wing vein 1 M +Rs more or less uniformly curved; crossvein 1cu-a weakly convex, arising opposite to 1 M +Rs; crossvein 1m-cu irregular, about as long as vein 1-Rs+ M; limit between veins 1mcu and 1-Rs+ M more or less traceable; vein 1-Rs+ M with bulla placed near basal 0.4; vein 2Cua 1.23 × as long as crossvein 2cu-a; 3r-m nebulous, about as long as 2r-m; vein 3- M distinctly longer than 2- M; AWH 0.94, AAW 0.45; areolet 0.31 × as high as wide; APH 0.97; vein 4- M nebulous, approximately straight. Hind wing with 9 hamuli; vein M +Cu apically moderately convex; vein M forming straight angle with vein Cua; HW1 C 1.64; vein Cub straight, forming straight angle with Cua; vein 2-Rs apically nebulous.
METASOMA. T 1 LW 1.32, T 1WW 2.19; spiracle slightly prominent, at 0.50 of T 1 length; median depression distinct; lateral depression distinct; dorsolateral carina represented by blunt ridge; ventrolateral carina sharp, complete. T 2 LW 0.85, T 2WW 1.84; thyridium about as wide as long. Tergites 2–8 coriarious; pilosity progressively denser on posterior tergites, and dorsally as dense as laterally. Ovipositor slightly downcurved; OST 0.76; dorsal valve scarcely punctate; ventral valve slightly overlapping dorsal valve, its apex with 8 teeth.
COLOUR. Head, mesosoma and metasoma black, dark brown and yellow. Head black; basal 0.5 of mandible, labrum, clypeus except lateral corners and area around median tooth, and most of supraclypeal area yellow. Supra-clypeal area centrally with two small blackish marks. Palpi dark brown. Orbital band yellow, complete, covering almost entire width of gena on its ventral 0.3. Antenna mostly dark brown; scape ventrally with very small yellowish spot; f7–11 entirely white, f6 almost entirely white. Mesosoma black; pronotum (except median longitudinal stripe), propleuron, central spot on mesoscutum, tegula, scutellum, postscutellum, subalar ridge, part of epicnemion, most of ventral portion of mesopleuron, hypoepimeron, dorsal division of metapleuron, posterior mark covering 0.2 of metapleuron and sublateral marks on posterior area of propodeum yellow. Fore and mid coxae pale yellow, dorso-apically with small brown spots; fore first trochanter dorsally blackish, ventrally yellow; mid first trochanter marked with orange and blackish; fore and mid second trochanter orange; fore and mid femora orange, dorsally with longitudinal blackish marks; fore and mid tibia and tarsi brownish, tarsi blackish towards apex. Hind coxa mostly yellow, ventrally somewhat orange, laterally with longitudinal brownish stripe on basal 0.75, dorsally with brown mark on apical 0.6; hind trochanters and base of femur marked with orange and blackish; remainder of hind femur and tibia blackish, except extreme base of tibia brown; extreme base of hind t1 and t5 blackish; remainder of hind tarsus whitish. Wings hyaline. Metasoma mostly yellow; T 1 dorsally dark brown on median 0.4; T 2–8 dark brown on anterior 0.5–0.7.
This species can be confused with a Cyclaulus , but it has a weak lateral expansion on T 1 (vs absent in Cyclaulus ), and the petiolar spiracle is placed basad to the midlength (vs apicad). Structurally, D. apaensis sp. nov. differs from all other species in the genus by having four exclusive features: 1m-cu about as long as vein 1Rs+ M; fore wing vein 1 M +Rs more or less uniformly curved; supra-antennal area dorsally with distinct median line, ventrally fading; and scuto-scutellar groove shallow. In colour, it can be isolated by having lateral yellow marks on the mesoscutum ( Fig. 4 B View Fig ).
The new species is most similar in colour to D. mexicanus ; these are the only two species in the genus having posterior and lateral yellow stripes on all tergites. It can be differentiated from D. mexicanus by having the body matte with pale yellow marks (vs shiny with bright yellow marks); hind tibia blackish ( Fig. 4 C View Fig ) (vs deep yellow, Fig. 11 C View Fig ); hind t1–4 whitish (vs bright yellow); supra-clypeal area with blackish marks (vs entirely yellow); mesoscutum with lateral yellow marks (vs without lateral yellow marks); fore and mid coxae pale yellow with small dorso-apical brown spot ( Fig. 4 B View Fig ) (vs dorsally bright yellow, Fig. 11 C View Fig ). Structurally, it differs from D. mexicanus in 59 features, of which the most important are the metapleuron rugulose ( Fig. 4 B View Fig ) (vs distinctly lineate, Fig. 11 B View Fig ); anterior area of propodeum coriarious (vs coriarious-punctate); fore wing vein 3r-m about as long as 2r-m (vs distinctly shorter than 2r-m); fore wing vein 3- M distinctly longer than 2- M (vs about as long as 2- M); mesoscutum coriarious and matte (vs densely punctate and shiny); mesopleuron almost entirely lineate (vs mostly finely punctate, only on dorsal posterior corner distinctly lineate); anterior transverse carina laterally approximately straight, medially slightly arched forwards (vs slightly arched forwards, medially more distinctly curved); pronotum weakly striate along posterior margin and collar (vs distinctly striate along collar, weakly striate along posterior margin); scuto-scutellar groove shallow and weakly carinulate (vs moderately deep, distinctly carinulate); AWH 0.94 (vs 1.04–1.16); supra-antennal area medially coriarious (vs with some rugae); ventral valve slightly overlapping dorsal valve (vs distinctly overlapping dorsal valve); T 1WW 2.19 (vs 2.43–2.86); CHW 0.52 (vs 0.44–0.48); T 2WW 1.84 (vs 1.49–1.67).
The new species is also similar in colour to D. daelus sp. nov., from which it can be isolated by having T 4–8 dark brown, with wide posterior yellow stripes (vs fully black); scutellar carina yellow (vs black); mesoscutum with lateral yellow marks (vs without lateral yellow marks); propleuron yellow (vs black); fore and mid femora orange, dorsally with longitudinal blackish marks (vs fore femur blackish with anterior face yellow on apical 0.7 and mid femur blackish); and hind tibia blackish (vs dark yellow, blackish on apical 0.2). Structurally, it differs from D. daelus sp. nov. in 62 features, of which the most important are the posterior area of propodeum strigate (vs strigate-rugulose); anterior transverse carina laterally approximately straight, medially slightly arched forwards (vs distinctly arched forwards, somewhat bell-shaped); fore wing vein 3r-m about as long as 2r-m (vs distinctly shorter than 2r-m); fore wing vein 3- M distinctly longer than 2- M (vs about as long as 2- M); APH 0.97 (vs 1.48); HW1 C 1.64 (vs 2.27); sternaulus moderately deep, posterior 0.4 almost indistinct (vs deeply impressed, almost indistinct on posterior 0.25); median depression of T 1 distinct (vs absent); ventral valve slightly overlapping dorsal valve (vs distinctly overlapping dorsal valve); MLW 1.50 (vs 1.19); anterior area of propodeum coriarious (vs coriarious-punctate); median tubercle of clypeus placed mostly on apical area (vs placed entirely on apical area); supra-antennal area medially coriarious (vs with some rugae); and scuto-scutellar groove weakly carinulate and shallow (vs distinctly carinulate, deep).
The new species is most similar in structure to D. tibialis , from which it differs in 49 features, of which the most important are as follows: posterior area of propodeum strigate (vs rugulose); apical area of clypeus narrow (vs moderately long); fore wing vein 3- M distinctly longer than 2- M (vs about as long as 2- M); crossvein 1cu-a weakly convex (vs convex); scuto-scutellar groove shallow and weakly carinulate (vs deep, distinctly carinulate); pronotum weakly striate along posterior margin and collar (vs distinctly striate along posterior margin and collar); sulcus between sternaulus and scrobe distinct (vs almost indistinct); sternaulus with weak vertical wrinkles (vs with distinct vertical wrinkles); ventral valve of ovipositor slightly overlapping dorsal valve (vs distinctly overlapping dorsal valve); ovipositor slightly downcurved (vs straight).
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet
Harvard University - Arnold Arboretum
Amherst College, Beneski Museum of Natural History
University of Copenhagen
Field Museum of Natural History, Botany Department
Royal Botanic Garden Edinburgh
Department of Botany, Swedish Museum of Natural History
Naturhistorisches Museum Wien
Nationaal Herbarium Nederland, Leiden University branch
Canadian National Collection Insects
Botanische Staatssammlung M�nchen
Tavera, Department of Geology and Geophysics
Ivan Franko National University of Lviv
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