Chelonus rostratus
authorTobias 1966
synonyms
body
shape3.3 -3.5 mm. [T15]. 3.3-4.0 mm [T6][P3]. 4.0 mm [Lo1]. 3.6 - 4.0 mm [TL2]. 3.0-3.4 mm [Ab2]. 3.3 mm [By1].
colorBody black [Lo1].
head
shape♀ Head (Fig. 1) 2.5 times wider than its length, roundly narrowed behind eyes; occiput rather deeply notched; the width of the base of the ocellar triangle is equal to the distance from it to the eye; distance between posterior ocelli almost 4 times the ocelli diameter; height of face almost half its width, 1.5 times height of clypeus; clypeus height slightly less than its width; labiomaxillary complex elongated into proboscis equal in length to face height; maxillary and labial palps equal in length, their length equal to the height of the face with clypeus, labial palps 4-segmented, their penultimate segment strongly developed, much longer than the previous one, twice as long as the last segment [T15]. Maxillary palp strongly elongated, its length not less than height of head; labio-maxillary complex forming considerably projecting proboscis [T6]. ♂ Head roundly narrowed behind eyes, twice as broad as long, in frontal view 1.3 times as broad as high, a little broader than mesosoma. Ocellar triangle as long as OOL. POL 6 times longer than Od. Temples almost as long as LO. In frontal view eye twice as high as long and 2.5 limes as long as malar space. Face looks broader, 1.6 times as broad as high and 1.5 limes as broad as LD, about twice as high as clypeus. Rostrum as long as height of head [Lo1]. Roundly narrowed behind eyes, twice as broad as long, as broad as mesosoma; in frontal view 1.3 - 1.5 times as broad as high. Ocelli small, widely separated, POL=OOL. LO 1.7 times TD and 2.5 times the length of malar space. Temples almost as long as LO. Maxilar palpi as long as height of head or slightly longer [TL2]. Head transverse, narrowed backwards; relative size ratios of length: width: height like 5: 11: 9; shorter diameter of the eyes as long as the width of the temples; Malar space twice as long as the base of the mandible. Eyes oval, 1.9 times as long as wide; OOL 1.5 times POL; maxillary palpi 0.3 times as long as head height; Rostrum as long as the length of the eyes [By1]. Temple in dorsal view receded (Fig. 17) [P3]. Maxillary palpi long, approximately as long as height of head. Moulhparts produced into proboscis [T4].
sculptureClypeus smooth [T15]. lead striate, face with converse slrigosily. Vertex finely transversely striate. Frons weaker sculptured. Clypeus largely not sculptured, but weakly punctate, shining [Lo1]. Head behind eye and face transversely striate. Frons with concentric sculpture. Clypeus largely not sculptured, weakly punctate and shining [TL2]. Clypeus cross-shaped, finely punctated, but the face is roughly reticulate; Occiput transversely rugose [By1].
colorPalpi dark-brown [Lo1]. Labiomaxillary complex dark brown [TL2].
antenna
shape ♀Antenna is slightly longer than the head + mesosoma. Scapus almost twice as long as 3rd segment; segments of flagellum three times as long as wide, apical twice as long as wide [T15]. Segments in apical part of antenna as long as wide [T6]. Antennae 16-segmented, a little longer than head and mesonotum combined; scape slightly broader than flagellum, 2.5 - 3 times as long as wide; flagellum appearing slender, 3rd antennal segment 3 times as long as broad, apical segments 2 - 2.5 times as long as broad (laterally slender) [TL2]. Antennae thin, especially narrowed towards the tip, shorter than the body (50: 83); Scapus 2 times as long as wide; 3rd segment 2.5 times as long as wide; penultimate segment 2 times as long as wide [By1].
shape ♂Antennae with 20 segments, scarcely longer than head and mesonolum combined: scape not widened, slightly wider then flagellum, 2.5 times as long as wide; 3rd segment 3 limes as long as wide, apical segments (17-20) 1.5 - 1.7 times as long as wide [Lo1]. Antennae 19 - 20 segmented, a little longer than head and mesosoma combined; not thin like in female, apical segments 1.5 - 1.7 as long as broad [TL2].
colorAntenna black [T6].
mesosoma
shapeMesosoma is a quarter longer than its height. Propodeum with with a weak transverse ridge and with teeth on the sides [T15]. ♂ In dorsal view a little narrower than head, broader than carapace. In lateral view, 1.5 limes as long as high and almost as long as length of carapace [Lo1]. Propodeum with clear transversal carina and two more or less distinct medial longitudinal carinas (looking like two small teeth at transverse carina), lateral tubercles well developed [Lo1]. In dorsal view a little broader than carapace. In lateral view, 1.5 times as long as high and almost as long as length of carapace. Propodeum with clear transversal carina and two more or less distinct medial longitudinal carinae, lateral tubercles well developed [TL2]. Relative size ratios of length: width: height as 31:31:25 [?], notauli invisible. Posterior pronotal and marginal furrow of the mesopleura lined and notched at the anterior margin [By1]. Propodeum with lateral denticles [T4].
sculptureMesonotum before scutellum and along notauli and median line coarsely cellular rugose. Sides of mesosternum coarsely cellular rugose [T15]. Mesonolum rugose-rugulose punctate, scutum anteriorly smoother, finely punctate and longitudinally striate, area before scutellum with pronounced coarse rugae. Sides of mesonotum roughly rugose-punctate with unclear transversal sculpture. Scutellum laterally and posteriorly with short longitudinal sculpture and punctate, centrally smoother and shining. Propodeum roughly rugose [Lo1]. Mesonotum rugose punctate. Scutum anteriorly granulate punctate, area before scutellum with coarse rugae. Scutellum largely (mainly laterally and posteriorly) with soft longitudinal sculpture, centrally punctate and more or less shining. Propodeum roughly rugose [TL2]. Mesosoma everywhere coarsely reticulate rugose [By1].
color
legs
shapeHind femora thickened, strongly narrowed at base, three times as long as wide; large spur of hind tibia slightly shorter than half of 1st tarsus segment; 5th segment of hind tarsus equal to 3rd, less than 2nd [T15]. ♂ Fore femora 3.5-4.0 times as long as broad,fore tibiae longer than tarsi. Hind femora 3.5 times as long as broad, hind tibiae 1.3 times longer than femora and as long as tarsi. Outer spur of hind tibiae longer than inner, almost reaching half of first metatarsal segment which is 2.5 times longer than second, second segment 1.2 times longer than third, fourth and filth segments almost equal [Lo1]. Fore and hind femora 3 - 3.5 times as long as broad. Hind tibiae shorter than femora and as long as tarsi. Outer spur of hind tibiae longer than inner spur, reaching half of 1st metatarsal segment [TL2]. Legs strong, relative length ratios of the rear coxa: trochanter: femur: tibia: tarsus like 23: 12: 35: 45: 47; thickened at the base; The spurs of the posterior tibia are 0.7 times as long as the 2nd tarsal segment and 1.2 times as long as the fourth [By1].
sculpture
colorLegs black; fore tibia and apices of fore femora yellowish red; middle tibia brownish; spurs are yellow [T15]. Hind femur black [T6]. coxae black; hind femora black, tibiae brown with yellowish base, tarsi dark-brown [Lo1]. all coxae black; fore femora black except apexes, hind femora black; fore tibiae brown-yellowish; all tarsi dark [TL2]. Mid tibia and base of hind tarsi brown; tips of the hind tarsi blackish-brown [By1].
wings
shape1-R1 is equal to the length of the pterostigma; r equal to 3-SR, 4-5 times shorter than SR1; cu-a extends at a distance of a quarter of the length of the posterior side of the discoidal cell [T15]. Marginal cell in forewing long,1-R1 1.1 times as long as length of pterostigma. Second submarginal cell comparatively big, 2.5 times smaller than marginal cell. 3-SR as long as r, 4 times shorter than SR1; SR1 distinctly crooked at the middle. Distance from cu-a to basal vein 1.2 times shorter than cu-a [Lo1]. Marginal cell in forewing great, 1-R1 as long as length of pterostigma or slightly longer. Second submarginal cell comparatively big. 3-SR as long as r, 4 - 5 times shorter than SR1; SR1 crooked in the middle [TL2]. Forewings (Fig. 15) shorter than the body (57: 83); R ends well before the wing tip; vein r arising behind the middle of the pterostigma, shorter than the pterostigma width (7: 10) and longer than 3-SR (7: 5); 3-SR 1.2 times as long as r-m and half as long as 2-SR; SR1 almost straight, 5 times as long as 3-SR [By1].Vein 1-R1 as long as pterostigma, i.e. marginal cell long; pterostigma wide, 2.3 times as long as wide and issuing r just distally from its middle (Fig. 18) [P3].
colorWings are slightly darkened, stigma and veins are brown [T15]. Forewings infuscate with a slightly paler belt on the course of the medial vein and infuscation below pterostigma. Pterostigma and most veins brownish (basally they are yellowish, except costa) [Lo1][TL2]. Wing veins brown, pterostigma blackish-brown [By1]. Wings hyaline to subhyaline [P3].
metasoma
shapeThe metasoma is longer than the mesosoma, oval; its back is slightly bent; length of metasoma 2.5 times its width in the middle, 4 times its apical height [T15]. ♂ Carapace oval-elongate, 1.8 times as long as maximum breadth. In lateral view enlarged posteriorly, about 2 times as high posteriorly as anteriorly [Lo1]. Carapace oval-elongate, in dorsal view 1.6 - 1.8 times as long as maximum breadth, incurved apicoventrally for 0.2 of its length. Hypopygium often not visible (rather rarely visible) and not projecting beyond the rim. ♂ Carapace oval-elongate, in dorsal aspect 1.7 - 1.9 times as long as its maximum breadth (see variations in Figs 11, 12) [TL2]. Metasoma (fig. 16) oval, longer than the mesosoma (36:31) [By1]. Carapace in lateral view apically convex (Fig. 19), in dorsal view more globose (Fig. 63) [P3].
sculptureCarapace with rough longitudinal rugae [T15]. Carapace with pronounced longitudinal, more or less rectilinear, undulations spanning almost its entire visible surface. Sculpturing of carapace sometimes in a whirl of coarse elements [Lo1][TL2]. Longitudinally rugose [By1]. Metasoma strongly striated (Fig. 20) [P3]. Metasoma with coarse, almost not anastomosing longitudinal folds more or less reaching abdominal apex [T4].
colorMetasoma black [T6].
♀ ovipositorOvipositor thin and (a) long in case of projecting hypopygium (laterally, its total length 2/3 of carapace length (Fig. 8), or (b) slighly projecting beyond posteroventral rim of carapace, rarely hidden (Fig. 7).[TL2]. Ovipositor almost as long as hind trochanter [By1].
♂ apertureAperture small, oval; in rear view of posterior end about 0.22 height and 0.2 of carapace’s width [Lo1]. Aperture small and oval, in rear view of posterior end about 0.25 (in small specimens, Fig. 14) or at most less than 0.3 (as in Fig. 13) of width of carapace [TL2].
other info
distributionNL [FE].
remarksThe species is clearly defined by elongated segments of palpi (rostrum at least as long as head height). The sculpturing of carapace resembles such species as M. rimulosus (Thoms.) and M. scabrosus (Szépl.) or so in looks. Long marginal cell, long and incurved SR1 (4 times longer than r) are important diagnostic criteria, untypical for most of Microchelonus [Lo1].
hosts
