Chelonus pini
authorTobias 2002
synonyms
body
shape♀: 3.0 - 3.2mm. [T12].
colorBody black [T12].
head
shapeHead oval in front view, roundly narrowed behind eyes in dorsal view, 1.2 times as wide as mesonotum, 2.1 times as wide as long, 1.2 times as wide as high. Length of temple equal to transverse diameter of eye. Ocellar triangle as wide as OOL. POL 2.5 times as long as ocellar diameter. Longitudinal diameter of eye 1.5 times as long as transversal diameter, twice as long as malar space, 0.85 times face width. Face 2.3 times as wide as high, 1.2 times as high as clypeus. Maxillary palpi as long as height of face and clypeus combined [T12].
sculptureHead behind ocelli faintly transversely rugulose and with dense granulate sculpture. Frons coarsely concentrically rugose; face concentrically rugulose and with granulate sculpture [T12].
color
antenna
shape ♀Antenna as long as head, mesosoma and one-third of metasoma combined. 3rd segment 3 times, 5th 2.5 times and 8 - 10th twice as long as wide; segments of apical part of antenna 1.5 times as long as wide [T12].
shape ♂
color
mesosoma
shapeMesosoma 1.3 times as long as high. Propodeum with transversal carina and a pair of acute lateral tubercles [T12].
sculptureMesonotum densely rugulose-punctate, before scutellum reticulate rugose, with longitudinal rugae dominant [T12]. Propodeum in front of transverse carina coarsely cellular-rugose [T14].
color
legs
shapeHind femur 3.5 times as long as wide. Hind tibia longer than hind tarsus, 5 times as long as wide. Inner spur of hind tibia 0.45 times as long as hind basitarsus. Apical segment of hind tarsus as long as 3rd segment, shorter than 2nd one [T12].
sculpture
colorFore femora apically, fore tibiae and 1st basitarsi, except for apical parts, brown-yellow. Middle tibia yellow-brown. Hind tibia brown, with large yellow band [T12].
wings
shapeMarginal cell 1.5-2 times as large as 2nd submarginal cell. Pterostigma 1.5 times as long as R1 [metacarpus]. SR1 faintly bended apically or rectilinear, 3 or 4 times as long as r, 1.3 - 1.8 times as long as 2-SR; r as long as 3-SR [T12]. Pterostigma 1.5 times as long as 1-R1 [T14].
colorWings finely infuscate, before basal vein light; pterostigma and veins brown, mediocubital and basal veins yellowish [T12].
metasoma
shapeCarapace of metasoma oval, 1.6-1.65 times as long as wide, 3 times as long as high, incurved apicoventrally in 0.1 of carapace length [T12]. Metasoma with depression at apex [T14].
sculptureCarapace rugulose-punctate, with granulate microsculpture, longitudinally rugulose, apical third only with granulate sculpture [T12].
color
♀ ovipositorOvipositor hidden [T12].
♂ aperture
other info
distributionFR, NL [FE].
remarksM. pini sp. n. differs from M. subcontractus in the longer apical segments of antenna, coarser sculpture of frons and lateral parts of face [T12].
hosts
type description
Microchelonus pini sp. n.
(Figs 8-10)
Holotype. ♂, Russia, Vladimir, "kieferwald" [pine forest], 3.VII.1928 (V. Sokanovsky).
Paratype. ♂, Russia, Bryansk, 2.VI.1927 (V. Stark)/ Sokanovsky [ crossed out], Bryansk/ Chelonella sulcata Nees, Ch. Ferriere det.
Description. Female. Body length 3-3.2 mm. Head oval in front view, roundly narrowed behind eyes in dorsal view, 1.2 times as wide as mesonotum, 2.1 times as wide as long, 1.2 times as wide as high. Length of temple equal to transverse diameter of eye. Ocellar triangle as wide as OOL. POL 2.5 times as long as ocellar diameter. Longitudinal diameter of eye 1.5 times as long as transversal diameter, twice as long as malar space, 0.85 times face width. Face 2.3 times as wide as high, 1.2 times as high as clypeus. Maxillary palpi as long as height of face and clypeus combined. Antenna as long as head, mesosoma and one-third ofmetasoma combined. 1st flagellar segment 3 times, 3rd 2.5 times and 6-8th twice as long as wide; segments of apical part of antenna 1.5 times as long as wide.
Mesosoma 1.3 times as long as high. Propodeum with transversal carina and a pair of acute lateral tubercles. Radiai cell 1.5-2 times as large as 2nd radiomedial cell. Pterostigma 1.5 times as long as metacarpus. 3rd abscissa of radial vein faintly bended apically or rectilinear, 3 or 4 times as long as 1st abscissa, 1.3-1.8 times as long as 1st radiomedial vein; 1st abscissa as long as 2nd. Hind femur 3.5 times as long as wide. Hind tibia longer than hind tarsus, 5 times as long as wide. Inner spur of hind tibia 0.45 times as long as hind basitarsus. Apical segment of hind tarsus as long as 3rd segment, shorter than 2nd one. Carapace of metasoma oval, 1.6-1.65 times as long as wide, 3 times as long as high, incurved apicoventrally in 0.1 of carapace length. Ovipositor hidden.
Head behind ocelli faintly transversely rugulose and with dense granulate sculpture. Frons coarsely concentrically rugose; face concentrically rugulose and with granulate sculpture. Mesonotum densely rugulose-punctate, before scutellum reticulate rugose, with longitudinal rugae dominant. Carapace rugulose-punctate, with granulate microsculpture, longitudinally rugulose, apical third only with granulate sculpture. Body black. Fore femora apically, fore tibiae and 1st basitarsi, except for apical parts, brown-yellow. Middle tibia yellow-brown. Hind tibia brown, with large yellow band. Wings finely infuscate, before basal vein light; pterostigma and veins brown, mediocubital and basal veins yellowish.
Comparison. M. pini sp. n. differs from M. subcontractus in the longer apical segments of antenna, coarser sculpture of frons and lateral parts of face. According to the key of West-Palaearctic species of Microchelonus (Tobias, 1986), M. pini is close to M. caucasicus (Abdinbekova, 1967) and differs in the shortened radial cell, shorter meso- and metasoma, and coarser sculpture of frons. According to the key of East-Palaearctic species of Microchelonus (Tobias, 2000), M pini is similar to M inserenus Tobias, 1989 and differs in the shorter meso- and metasoma, coarser sculpture of frons and lateral parts of face, and more distinct yellow band of hind tibia.
Data used in the multi-access key
These data are collected from the species descriptions and redescriptions, from published figures and photographs and from own measureements and observations. For a description of the different variables and value classes see this
pdf.
| morphology |
| basic information | female | male |
| body length (mm): | (2.8) 2.8 - 3.3 (3.4) | (2.8) 2.8 - 3.3 (3.4) |
| number of antennal segments: | 16 | --- |
| head, dorsal view |
| Head width : length | very narrrow, narrow | very narrrow, narrow |
| Temples narrowing - widening | parallel, widening | parallel, widening |
| Eye length : temple length | 1.0 - 1.25, > 1.25 | 1.0 - 1.25, > 1.25 |
| Roundness temple | weak | weak |
| POL : OD | 2 - 3 | 2 - 3 |
| Ocellar triangle shape | very wide | very wide |
| Excavation of head | 15 - 25%, 25 - 35% | 15 - 25%, 25 - 35% |
| head, lateral view |
| Head height : length | --- | --- |
| Eye height : length | --- | --- |
| Temple length : eye length | --- | --- |
| head, frontal view |
| Head width : height | very narrow, narrow | very narrow, narrow |
| Face width : height | very wide | very wide |
| Eyes converging ventrally | --- | --- |
| EH : MSL | short | short |
| Clypeus width : height | --- | --- |
| Clypeus extending above bottom of eyes | --- | --- |
| Tentorial pits | --- | --- |
| Shape of lower margin clypeus | --- | --- |
| antennae |
| Antennal shape | --- | filiform, not widened |
| Segment 3 length : width | medium | --- |
| Penultimate segment length : width | medium | --- |
| Length of antenna : length of body | 2: short, 3: long | --- |
| mesosoma, lateral view |
| Length : height | short | short |
| transverse carina | present | present |
| lateral teeth | present | present |
| mesosoma, ventral view |
| Prepectal carina lamelliform | indistinct | indistinct |
| legs |
| Hind femur length : width ratio | medium | medium |
| Hind tibia length : hind tarsus length ratio | long | long |
| Hind tibia (longest) spur length : metatars length ratio | short, long | short, long |
| wings |
| Vein 1-R1 length : pterostigma length | short | short |
| Vein r length : vein 3-SR length | short | short |
| Shape vein SR1 (straight / concave / convex) | slightly convex, convex | slightly convex, convex |
| S-shape vein SR1 | not S-shaped | not S-shaped |
| cell M : cell Sm2 | Sm2 large, Sm2 medium | Sm2 large, Sm2 medium |
| Pterostigma length : width ratio | short, medium | short, medium |
| Angle between radial vein (r) : vein 1-R1 | medium, blunt | medium, blunt |
| metasoma, dorsal view |
| Length : width ratio of metasoma | short | short |
| Shape of metasoma | narrowing to apex, widest in middle | narrowing to apex, widest in middle |
| metasoma, lateral view |
| Length : height ratio of metasoma | medium | medium |
| posterior : anterior height ratio of metasoma | --- | --- |
| Position of maximum height | --- | --- |
| metasoma, ventral view |
| Metasoma posteriorly curved forwards | just/slightly incurved, (distinctly) incurved | just/slightly incurved, (distinctly) incurved |
| male apical aperture |
| Aperture width : metasoma width | no aperture | small, medium, large |
| Aperture shape | n. a. | (nearly) round, oval, elongate - slit |
| Median process shape | n. a. | --- |
| sculpture |
| head |
| general coarseness | fine | fine |
| clypeus |
| coarseness punctation | --- | --- |
| density punctation | --- | --- |
| face |
| sculpture type | rugose | rugose |
| sculpture direction | diagonal/concentric | diagonal/concentric |
| vertex and temple |
| sculpture type | transverse rugulose | transverse rugulose |
| mesonotum |
| sculpture type | --- | --- |
| scutellum |
| middle | --- | --- |
| lateral | --- | --- |
| metasoma |
| base - mid sculpture | longitudinally rugose / rugose-striate | longitudinally rugose / rugose-striate |
| sculpture at apex | rugulose | rugulose |
| coarse / fine boundary | mid (50 - 70%) | mid (50 - 70%) |
| color |
| head |
| mandibles color pattern | --- | --- |
| palpi, lightest color | --- | --- |
| antennae |
| scapus, lightest color | black, dark brown | black, dark brown |
| segment 3 and 4, lightest color | black, dark brown | black, dark brown |
| legs |
| fore coxae lightest colour | dark | dark |
| fore femur lightest colour | medium light | medium light |
| fore femur color pattern | tip light | tip light |
| hind femur lightest colour | dark | dark |
| hind femur color pattern | entirely dark | entirely dark |
| hind tibia lightest colour | light | light |
| hind tibia color pattern | wide light ring | wide light ring |
| hind basitarsus lightest colour | dark | dark |
| hind tarsus segment 2-3 lightest colour | dark | dark |
| wings |
| middle veins lightest colour | medium dark | medium dark |
| basal veins lightest colour | light | light |
| metasoma |
| metasoma colour pattern | entirely dark | entirely dark |
| metasoma lightest colour | dark | dark |
| metasoma base, colour pattern | entirely dark | entirely dark |
| metasoma base, light spots | n.a. | n.a. |
| metasoma base, light band | n.a. | n.a. |
Chelonus pini in published keys
T14: Tobias, 2010
Palearctic species of Microchelonus Szépligeti (Hymenoptera: Braconidae, Cheloninae): key to species.
