Chelonus microphtalmus
authorWesmael, 1838
synonymsdilatus Papp, 1971; exilis sensu Tobias, 1976, 1986 [T10]
body
shape1 1/2 li. [W2]. ♂ 2.9 - 4.0, usually 3.5 - 3.8, mm, ♀ (3.1-)3.7 - 4.0 mm [P1][T2]. 3.0 - 3.5mm [T10][T14]. 2.45 mm (♀) [By1].
colorBody black [P1].
head
shapeThird segment of the maxillary palpi is neither wider nor thicker than the following ones. The eyes are quite narrow, almost not protruding, so that the head seen from above, is roughly shaped like a segment of a sphere [W2]. Head in dorsal view transverse (Fig. 1), ♂ Head usually 1.8-1.9 times, less usually 1.75-1.8 times as broad as long, ♀ Head more transverse, (1.8-)1.9-1.95 as broad as long. Temple somewhat bulging i.e. head between temples broader than between eyes; temple rounded, occiput excavated, eye somewhat shorter than temple. Ocelli small, round, distance between fore and hind ocelli somewhat greater than diameter of an ocellus, OOL as long as POL. Eye in lateral view (Fig. 2) slightly more than twice as high as wide, temple somewhat wider than eye. Face clearly twice as wide as high, inner margin of eyes just diverging. Distance between tentorial pits equal to that between lowest point of eye and tentorial pit. Malar space as long as basal width of mandible. Lower margin of clypeus convex. Hypostomal and temporal carinae not meeting each other (Fig. 3; see arrows) [P1]. Head more or less widened behind eyes. Width of head nearly twice (1.8–1.95 times) its length. Temples slightly longer than transverse diameter of eye. OOL equal to POL, distance between anterior and posterior ocelli equal to diameter of ocellus. Width of face twice its height. Height of gena equal to basal width of mandible [T2]. Head nearly round in front view. Head usually distinctly widened behind eyes, frequently markedly widened, occasionally not widened. Longitudinal eye diameter 3 times malar space [T10]. The head is more or less widened behind the eyes, the proboscis does not protrude from below. - Head width 1.8–1.95 times its length. Temples slightly longer than the transverse diameter of the eye. OOL equal to POL, distance between anterior and posterior ocelli equal to ocellus diameter. The width of the face is twice its height. The malar height is equal to the basal width of the mandible [T14]. Head transverse, widened backwards and curved in the middle. Length : width : height as 11 : 16 : 12. Eye as wide as temple, malar space three times mandible base, Eyes oval, longer than wide (16 : 11) [By1].
sculptureHead rugose [W2]. Face horizontally and head above transversely strio-rugose (Fig. 4), temple rather longitudinally striate. Clypeus finely punctate, shiny [P1]. Face and vertex transversely striate-rugose behind ocelli, temples longitudinally striate [T2][T14].
colorPalpi black, mandibles are black with brown-yellow tip [W2]. Mandible and palpi dark brownish [P1]. Mandibles and palpi brown [T14].
antenna
shape ♀♀ Female antenna with 16 antennomeres, about as long as head, mesosoma and fore half of metasoma. Flagellum distally more or less flattened, flatness extends to flagellomeres in a variable number [P1]. Antennae as long as head, mesosoma, and half of metasoma combined; flagellar segments more or less flattened [T2]. Antennae slender, filiform; apical flagellar segments 1.5-2.0 times as long as wide [T10]. Antennae equal to the total length of the head, mesosoma, and half of the mesosoma; segments of flagellum more or less flattened [T14]. Antenna shorter than body (40 : 61), scapus oval, 2.2 times as long as wide, Segment 3 twice as long as wide, penultimate segment 1.5 times as long as wide [By1].
shape ♂Antennae are as long as 3/4th of the body, 20 segments, barely and imperceptibly decreasing in thickness towards the end [W2]. ♂ Antenna usually with 19, rarely with 20, segments, Third segment slightly more than twice as long as broad [P1]. Male: antennae 19 - 20-segmented [T2][T14]. Antennae slightly shorter than body, filiform, 18-20-segmented [Te1].
colorAntennae black [W2].
mesosoma
shapePropodeum bidentate [W2]. Mesosoma in lateral view 1.6 times as long as high, one sixth less broad between tegulae than breadth of head. Mesonoturn in lateral view (Fig. 5) projecting above pronotum and thus rather concave anteriorly (see arrow). Notauli indistinct. Stemauli distinct by somewhat rougher rugosity. Propodeum laterally with a pair of rather small tubercules (Fig. 6) [P1]. Length of mesosoma 1.6 times its height. Propodeum with small lateral tubercles [T2]. Notauli are barely visible. Propodeum with a transverse ridge and obtuse short projections on the sides [Te1]. Mesosoma l:w:h as 48:30:29, notauli distinct, deep and punctated. Propodeum toothed on backside [By1].
sculpture♂ Mesonotum more or less entirely rugose with little subrugulose to uneven fields. Posterior rugo-striation of scutellum restricted apically, i.e. scutellum nearly entirely smooth and shiny with a few hairpunctures.
♀ Mesonotum usually rugose postero-medially and punctate to finely punctate laterally, interspaces shiny; less usually rugose surface is variable in size. [P1]. Mesosoma rugose; mesonotum before scutellum with undulate longitudinal rugae; lateral parts of mesonotum usually with smoothened sculpture; scutellum shiny, with smoothened sculpture [T2]. Lateral parts of mesonotum usually with strongly smoothed sculpture, shining [T10]. Sides of mesonotum and propodeum coarsely rugose [Te1]. mesosoma punctated and matt, but mesonotum shiny [By1].
♀ Mesonotum usually rugose postero-medially and punctate to finely punctate laterally, interspaces shiny; less usually rugose surface is variable in size. [P1]. Mesosoma rugose; mesonotum before scutellum with undulate longitudinal rugae; lateral parts of mesonotum usually with smoothened sculpture; scutellum shiny, with smoothened sculpture [T2]. Lateral parts of mesonotum usually with strongly smoothed sculpture, shining [T10]. Sides of mesonotum and propodeum coarsely rugose [Te1]. mesosoma punctated and matt, but mesonotum shiny [By1].
color
legs
shape♀ Hind femur 2.7-3 times as long as broad (Fig. 12). Hind tibia and tarsus equal in length, hind basitarsus as long as tarsomeres 2-4 combined [P1]. Hind femur 2.7–3.0 times as long as wide. Hind tarsus and tibia equal in length [T2]. Hind femur 3 times as long as wide [T10]. relative length of coxa:trochanter:femur:tibia:tarsus as 14:9:24:30:30. Hind femur 3.7 times as long as wide. Hind tibial spur short, as long as 2nd tarsal segment and longer than 4th segment (5:3) [By1].
sculpture
colorLegs are black, except inner side of fore-tibiae, which are yellow-brown [W2]. Legs brown, coxae and trochanters 2-3 blackish [P1]. Hind leg uniformly black [T10].
wings
shapeFore wing one-fourth shorter than body. Pterostigma (Fig. 8) three times as long as wide, issuing radial vein just distally from its middle, r shorter than width of pterostigma as well as 3-SR, less usually as long as width of pterostigma as well as 3-SR; SR1 faintly S-like arched and ending clearly before tip of wing ; R1 somewhat shorter than pterostigma (Fig. 8). m-cu interstitital; 3-CU1 more than three times as long as 2-CU1 [P1]. Marginal cell (according to figure) slightly larger than 2nd submarginal cell,1-R1 shorter than pterostigma [T2]. r noticeably longer than 3-SR and equal to r-m. SR1 almost straight. 4 - 5 times longer than 3-SR. 1-R1 almost as long as pterostigma. 2-SR 2.5 times as long as 3-SR. 2-CU1 is three times as long as 1-Cu1 [Te1]. 1-R1 slightly shorter than the pterostigma [T14]. Fore wing shorter than body (49:62). r 0.7 times pterostigma width, and 1.2 times 3-SR. 3-SR 0.4 times 2-SR and 0.18 times r-m [?]. SR1 5 times as long as 3-SR [By1].
colorWings are transparent with a slight dark tint [W2]. Pterostigma and veins opaque brownish [P1]. Veins and pterostigma brown [Te1]. Wing smoky, veins and pterostigma brownish black [By1]. Tegula brown [P1].
metasoma
shapeMetasoma is oval-oblong [W2].Carapace as long as head and mesosoma combined, in dorsal view (Fig. 9) elongate oval, slightly higher behind than basally. Basal converging pair of keels short. ♂ Length to breadth of carapace in dorsal view varies from 1.85 to 2.2, usually 1.9 tot 2.1 times as long as broad; length to height of carapace in lateral view varies from 2.8 to 3.5, usually 3.2 to 3.3 times as long as high. End of carapace in lateral view as in fig. 10. Carapace in ventral view (fig. 13) apically incurved, i.e. ventral cavity of carapace shorter than carapace itself. ♀ Carapace in dorsal view (Fig. 14) about twice as long as broad at middle, behind usually blunty pointed; in lateral view (Fig. 15) 2.8-3.1 times as long as high; in ventral view less incurved apically than that of male (Fig. 16) [P1]. Carapace in dorsal view 1.9-2.1 times as long as broad medially, not broadening posteriorly (Fig. 19) [P6]. Metasoma obtused and angular posteriorly, slightly bend apically, twice as long as wide [T2]. Metasoma oval or narrowed to apex more strongly than to base, weakly reflexed apically [T10]. Metasoma obtuse posteriorly, angular, apically slightly bent forward, twice as long as wide [T14].Metasoma : mesosoma as 55:48 [By1].
sculptureMetasoma rugose [W2]. Carapace with rather longitudinal and posteriorly weakening rugosity (Fig. 9). Rugosity of carapace less frequently weaker or stronger than in Fig. 14. ♀ Longitudinal rugosity of carapace variable in strength (Fig. 14) [P1]. longitudinally rugose-striate (Fig. 19) [P6].
colorMetasoma black [W2].
♀ ovipositorOvipositor sheath as long as hind basitarsus [P1].
♂ apertureA large gaping transverse slot [W2]. Apical foramen of carapace 2.2-2.3 times as wide as high (Fig. 11) [P1]. Aperture oval, occupying about 1/3 of width and height of metasoma [T2]. Aperture 4 times as wide as high [Te1].
other info
distributionBE, CH, DE, FR, PL, SE [FE]. In Europe, in the northern part of Europe it is less frequent to sporadic [P1]
remarks
hostsColleophora hemerobiella Scop. [Ay1]
