home species list Chelonus nigritibialis
Chelonus nigritibialis
authorAbdinbekova, 1971
synonyms
body
shape♀ 2.8-3.3 mm [Ab2]. ♂ 3.0 mm.[T14]. 2 mm [By1]. 2.6mm [T4].
colorBlack, body with short sparse stripes, densely wrinkled, dull [Ab2].
head
shapeHead slightly wider than mesosoma, slightly rounded-narrowed behind eyes, 2.5 times as wide as long; the occiput is deeply cut; temples 1.5 times shorter than eye width; ocelli in an obtuse triangle, the width of which is equal to OOL; POL is 4 times an ocellus diameter; ovoid eyes, their longitudinal diameter is 2.5 times the transverse diameter, 3 times longer than the malar space; height of face 1.5 times its width, half [twice?] the height of clypeus; clypeus height almost equal to width; the distance between tentorial pits is slightly greater than the distance from the pits to the eye; the proboscis is undeveloped; the maxillary palps are short [Ab2][T14]. Head relative size L:W:H = 17:40:28. In lateral view width of eye longer than width of temple (12:9). Malar space 3 times mandible base. Eyes oval, 1.8 times as long as wide. OOL = 1.5 times POL. Palpi half as long as head height. Rostrum not visible [By1].
sculptureClypeus densely but finely punctate, shining. Occiput [temple?] weakly cross-wrinkled [Ab2]. Vertex weakly transversely rugose behind ocelli [T14].
color
antenna
shape ♀Antennae slightly longer than head and mesosoma, thin, filiform; 3rd antennal segment 1.5 times shorter than scapus, slightly longer than 4th segment; segments of flagellum gradually shortening from base to apex (Fig. 1) [Ab2]. Length of preapical segments slightly greater than their width [T14]. Antenna shorter than body (45:66), scapus thick, 2.5 times as long as wide, 3rd segment 3 times as long as wide, following segments gradually shortening to penultimate segment which is slightly longer than wide (16:15) [By1].
shape ♂Antennae 19-24-segmented [T14, in key]
color
mesosoma
shapeThe mesosoma is almost 1.5 times as long as its height; notauli are clear; the propodeum is truncate, with two longitudinal ridges and two small teeth on the sides [Ab2]. ♀ Mesosoma length 1.4 times its height. Propodeum without transverse carina, with small lateral teeth. ♂ Lateral teeth of propodeum poorly developed [T14]. Mesosoma L:W:H as 53:40:35. Notauli only visible anteriorly [By1].
sculptureScutellum densely but finely punctate, shining [Ab2]. Mesosoma everywhere sculpted and matt [By1]. Mesonotum with smooth sculpture, lustrous [T4].
color
legs
shapeHind femora 4 times as long as wide; greater spur of hind tibia equal to one third of hind metatars; 5th segment of hind tarsus equal to 3rd, less than 2nd [Ab2]. Hind femur 3.5 times as long as wide. The hind tibia is shorter than the hind tarsus [T14]. Relative sizes of coxa: trochanter: femur: tibia: tarsus as 10:9:30:40:40. Hind femur 3.3 times as long as wide. Spur of hind tibia as long as 2nd tarsal segment and longer than the 4th segment (5:4) [By1].
sculptureHind coxae densely but gently wrinkled, punctate, slightly shiny [Ab2].
colorApices of femora, and tibiae of fore and hind legs reddish brown [Ab2]. ♀ Apex of femora, entire tibia of fore legs and apex of hind tibia reddish brown. ♂ Hind tibiae entirely black or brown [T14]. ♀♂ hind tibiae entirely black [T4].
wings
shape1-R1 is equal to the length of the pterostigma; 3-SR is equal to r, three times shorter than SR1, half as long as 2-SR; vein 1-CU1 = 0.5 2-CU1 (Fig. 2) [Ab2]. Fore wing shorter than body (57:61). Vein r starts beyond the middle of the pterostigma, shorter than pterostigma width (5:11), and almost as long as 3-SR (5:6). 3-SR longer than r-m (6:5) and shorter than 2-SR (5:11). SR1 almost straight and 3.3 times as long as 3-SR [By1].
colorThe wings are darkened, the stigma and veins are brown, the veins at the base of the wing are yellowish [Ab2]. Veins brown, pterostigma blackish-brown [By1].
metasoma
shapeThe metasoma is slightly shorter than the head and mesosoma, slightly curved behind, oval; twice as long as wide in the middle, three times as long as high in the apical third; the length of the ventral opening of the carapace is equal to 7/8 of the length of the metasoma [Ab2]. ♀ Metasoma oval, apically bent forward by 0.15 times its length, 1.5 times as long as wide. ♂ Metasoma oval, widest in the middle, 1.7 times as long as wide. [T14]. Metasoma egg-shaped and as long as mesosoma [By1].
sculptureMetasoma without distinct longitudinal rugae [Ab2][T4]. ♂ Sculpture of metasoma almost without longitudinal rugae [T14].
colorThe metasoma is completely black, without yellow basal spots [T14, in key].
♀ ovipositorOvipositor protrudes slightly from under the carapace [Ab2].
♂ apertureMale unknown [Ab2]. The apical aperture clearly occupies more than half of the metasomal width; the width of the apical aperture is 2.5 times its height [T14]. The apical aperture oval or elongated-oval [T14, in key].
other info
distributionFR, NL [T14]
remarksClose to Ch. (N.) contractus Nees, from which it differs in the sculpture of the metasoma, which is completely devoid of longitudinal rugae at the base, and completely black hind tibia [Ab2].
hosts