Chelonus pedator
author(Dahlbom, 1832)
synonymssecutor (Marshall, 1885)
body
shape♂ 2.8 - 3.1mm [D]. Body 3.3—4 mm long [P1][P6]. 3.3—3.5 [T4]. ♀ 3.3 - 4.1, ♂ 3.1 - 3.6 mm [T14].
colorBlack, covered with short, adpressed fine silky shiny pubescence, coriaceous punctate. [D]
head
shapeHead in dorsal view (Fig. 1) less transverse, 1.55 - 1.75 times as broad as long; temple bulged, i.e. head between temples broader than between eyes; temple 1.4 times as long as eye. Ocelli small and round, POL : OD : OOL as 12 : 3 : 12. Eye in lateral view (Fig. 2) 2.3 times as high as wide, temple strongly broadening behind eye, almost twice as wide as eye. Malar space as long as basal width of mandible. Face 1.52 times as wide as high, inner margin of eyes somewhat converging ventrally; clypeus clearly less wide than face, twice as wide as high; distance between tentorial pits twice as long as distance between pit and lowest margin of eye [P6]. Head massive, much wider than mesonotum, 1.5 times as wide as long [T4]. Frontal fovea large, shallow, geminated [M]. The pits on the forehead at the base of the antennae are large, shallow, separated by a longitudinal ridge, weakly striated, shining [Te1].
sculptureHead rugulose-subrugulose and subshiny-faintly dull, clypeus laterally punctate and medially almost smooth, shiny [P6]. Head finely shagreened, striolated round the orbits. Frontal fovea, smooth in front, striolated behind, geminated. Face thinly beset with whitish hairs; [M]. The face is covered with grayish hairs [Te1].
colorPalpi light brown [P6][D]. Mandible rusty [P6], pitchy at the apex [M].
antenna
shape ♀♀ Antenna with 21-23 segments,3rd segment three times as long as broad apically, further segments gradually shortening and from segment 20-22 somewhat attenuating so that penultimate segment 1.55-1.75 times as long as broad. Antenna shorter than body, about as long as head, mesosoma and half of carapace [P6]. Antennae slightly thickened in middle, with square segments (apical segments longer than wide) [T4]. Antennae 22-25-segmented; 3rd antennal segment 3 times as long as wide, 22–24th segment 1.5 times as long [T14]
shape ♂Antenna with 24-26 segments, penultimate segment 1.42-1.75 times as long as broad [P6]. Antennae 25-segments, as long as the body [M]. Antennae 24-26-segmented [T14]. Antennae as long as body, 23-25-segmented [Te1]. Antennal segments 22-25, length of antennal segment in apical part distinctly more than width [Zh1]. Antennae 24-25-segmented [T5].
colorAntennae dark with first 2 or segments light brown [D]. Antenna black [P6].
mesosoma
shapeIn lateral view somewhat elongated, 1.7 times as long as high [P6][T14]. Notauli distinct by somewhat crowded sculpture. Propodeum latero-medially with a pair of tubercules [P6]. Pronotum somewhat neck-like [M][P6]. Mesonotum in lateral view clearly declivous anteriorly (Fig. 3, see arrow). Pronotal collar extending greatly forward as cervix (Fig. 9) [T4]. Propodeum with small lateral tubercles [T14]. The pronotum is strongly elongated in the form of a neck, propodeum laterally with blunt teeth [Te1].
sculptureMesosoma rugose, propodeum areolate-rugose, mesonotum rugulose-rugose, scutellum laterally rugulose and medially punctate, interspaces shiny. Prescutellar furrow shallow, crenulate [P6]. Mesosoma somewhat shining, striolated. Mesonotum thickly punctulate, variolose with larger punctures before the scutellum, which is also punctulate and not margined. Propodeum finely reticulated, transverse, truncate, not denticulated [M]. Mesonotum densely punctate, more coarsely near scutellum. The propodeum is coarsely reticulate-rugose [Te1].
color
legs
shapeHind femur (Fig. 4) 3.0 - 3.5 times as long as broad medially. Hind tibia somewhat longer than hind tarsus; pair of spurs of hind tibia unequal in length, inner spur just as long as half basitarsus, hind basitarsus as long as tarsomeres 2-4 [P6].
sculpture
colorVar a: legs of about same color (light brown), var b: hind femora in middle and hind tarsi at tip dark [D]. Legs either reddish yellow, coxae and first trochanters black(ish), tarsi blackish fumous, or partly black, i.e. basal half of fore femur together with entire middle and hind femora black [P6]. Legs reddish-yellow, upper trochanters, 4 anterior femora at the base, hind pair entirely except a spot on the upper edge, 4 posterior tibiae at the apex, and all the tarsi, blackish [M]. Hind femora brownish yellow [T14]. Legs are red; Trochanter, base of fore- and middle femora, hind femora, except for a large spot on the upper side, apex of tibia and tarsus black [Te1].
wings
shapeFore wing about one-sixth shorter than body. Pterostigma 3.2 times as long as wide, issuing radial vein distally from its middle, R1 shorter than pterostigma, 1-R1 0.6 - 0.8 times as long as pterostigma, r shorter than 3-SR, SR1 straight and ending far before tip of wing [P6]. Marginal cell short, broad, as large as the stigma; SR1 slightly Insinuated, convex outwardly near the apex; radius of hind wings somewhat curved near the base, marginal cell narrowly lanceolate. Wings 6.9 mm [M]. 1-R1 considerably shorter than pterostigma [T5].
colorVeins weak, distinct, yellow-brown [D]. Tegulae black. Wings almost hyaline, pterostigma brownish, veins proximally opaque yellowish and distally opaque light brownish [P6]. Wings infumated, nervures stout, and, together with the stigma and parastigma, blackish [M]. Smoky wings; the stigma is black [Te1]. The wings are almost light [T14].
metasoma
shapeCarapace in dorsal view long (Fig. 5), about as long as head and mesosoma combined, 2.1 - 2.4 times as long as broad behind, narrowest at the base, and increasing in width to the obtuse apex [M][P6]. In lateral view (Fig. 6) 3.2 times as long as high behind; in ventral view apically incurved (Fig. 7), i.e. ventral opening shorter than carapace itself [P6]. ♀ Metasoma widened towards apical part, 2.3 times as long as wide, ♂ 2.1–2.3 times as long as wide [T14]. Metasoma of female at apex uniformly rounded; metasoma of male at apex with short keel and flat depressions on sides of it [T16].
sculptureCarapace longitudinally rugose (Fig. 5), basally with striate elements, pair of basal keels short and not distinct [P6][M].
color♂ Base of black metasoma seems dark brownish [D]. Metasoma immaculate [M].
♀ ovipositor
♂ apertureApical foramen of carapace small, elliptic, its horizontal width equal to length of hind tarsomeres 2-3 (Fig. 8) or 2.4-2.8 times as wide as high [P6]. An oblong transverse fissure with a small angular projection on its upper edge, and ciliated with whitish hairs [M]. Aperture of abdominal shield with carina-like protuberance [T4]. Aperture transverse [Te1]. Aperture oval, about one third of width of carapace [Zh1].
other info
distributionWestern Europe [T4]. CH,DE,CZ,DK- D,GB-G,NL,SE [FE]
remarksMuch like Ch. nigritulus, similar in size, form, punctation and rugosity [D]
hosts
