home species list Chelonus irritus
Chelonus irritus
authorTobias 1994
synonyms
body
shape♀ 2.6-2.9 mm. ♂ 2.9 - 3.4mm [T18].
color
head
shapeDistance between posterior ocelli 3 times diameter of ocellus. Longitudinal diameter of eye 1.5 times transverse diameter, and 0.77 width of face. Height of face 0.56 width, 1.2 times height of clypeus. Distance between tentorial pits 1.2 times distance from tentorial pit to eye. Maxillary palpi equal to height of face with clypeus [T18]. Malar space 0.4-0.5 times longitudinal eye diameter. Head strongly roundly narrowing behind eyes [T9]. Malar space equal to half the longitudinal diameter of the eye. POL is 3 times the diameter of the eye. Head 1.1 times as wide as mesoscutum, roundly narrowed behind eyes, 1.8 times as wide as long. Temples equal to the transverse diameter of the eye. Width of ocellar triangle greater than OOL by diameter of ocellus. Longitudinal eye diameter 1.5 times transverse one. Face width 1.8 times its height. Maxillary palps equal to height of face with clypeus [T14].
sculptureClypeus coarsely punctate, with transverse rugae in lower part and on sides, and shiny [T18]. Vertex and middle part of face with small transverse rugae. Clypeus coarsely punctured, with transverse rugae in lower part [T14].
colorPalpi dark brown [T18].
antenna
shape ♀Antennae with dense, small setae, and matt [T18]. Antennae filiform. Apical segments 1.3-1.5 times as long as wide (or almost twice as long as wide in Finnland). Apical antennal segments cylindrical or with depression, uncompressed [T9]. Antennae with dense small hairs, matt, as long as head and mesosoma combined; length of 3rd segment 3 times its width, preapical segment equal to its width [T14].
shape ♂Antennae filiform, as long as head, mesosoma and half metasoma: 21-22-segmented [T18]. Antennae 20-21-segmented, equal to the total length of head, mesosoma and half of metasoma [T14].
color
mesosoma
shapeLength of mesosoma 1.5-1.6 times height; lateral teeth of propodeum weakly obtusely angulate, transverse ridge not distinct [T18][T14].
sculptureMesonotum lacking developed longitudinal ridge in middle and with weak transverse rugules anteriorly. Scutellum coarsely rugulose-punctate and matt [T18]. Scutellum densely rugose-punctate, dull [T9]. Mesonotum with weak transverse rugae in front, irregularly cellular-rugose in front of scutellum. Scutellum coarsely rugose-punctate, matte [T14].
color
legs
shapeInner spur of hindtibia 0.4 length of 1st hindtarsal segment [T18]. Hind femur 3 times as long as wide. Hind tibia longer than hind tarsus [T14].
sculpture
colorApices of fore femora and fore tibia brownish yellow. Apices of mid femora and basal half of mid tibia, 1st hind tarsal segment yellowish brown. Tarsi, apical half of mid tibia, and entire hind tibia brown [T18]. Hind tibia entirely dark, occasionally slightly yellowish in the middle [T9]. Legs mostly dark-colored, hind tibiae brown. 1st segment of hind tarsus yellowish-brown [T14].
wings
shape1-R1 0.67 times length of pterostigma; 3-SR 1.5 - 2.0 times as long as r, 0.33 - 0.50 length of SR1 [?]; 0.50-0.67 times 2-SR. SR1 at apex convex outwardly or straight. 1-CU1 = 0.3-0.6 times cu-a [T18]. 1-R1 as long as, or slightly shorter than, pterostigma [T9]. The marginal cell of the fore wing is less than twice as large as the 2nd submarginal cell;1-R1 is 0.67 times as long as the pterostigma [T14].
colorWings weakly darkened [T18][T14].
metasoma
shapeLength of metasoma 1.9-2 times width [T18][T9]. Metasoma oval, widest near the middle [T9]. Metasoma elongated-oval, apically bent forward by 0.5 times as long as 1st segment of hind tarsus, 1.9–2 times as long as wide [T14].
sculptureMetasoma with weakly sinuate and faintly anastomosing longitudinal rugae extending as far as its apical third [T9]. Rather coarse at base [T14].
color
♀ ovipositorOvipositor hidden or protruding as far as length of 1-2 hindtarsal segments [T18][T14].
♂ apertureOpening at apex of metasoma very small, almost punctate, round or weakly oval [T18]. Aperture is very small, round or slightly transverse [T14].
other info
distributionNL [FE].
remarks
hosts