Chelonus mucronatus

Chelonus mucronatus

authorThomson 1874

synonyms

body

shape4 - 5 mill. (= 2.4-3.0 mm) [Th]. 3.0 - 3.1mm [P2]. 3.0 - 3.1mm [T14]. ~~4-5mm [T4][M2]~~

colorBlack [Th].

head

shapeHead in dorsal view (Fig. 1) transverse, 1.75 - 1.85x as broad as long, eye minutely shorter than temple, latter somewhat bulged or head between temples somewhat broader than between eyes. Ocelli small and almost round, POL : OD : OOL as 9 : 4 : 11. Eye in lateral view (Fig. 2) more than 2x as high as wide, temple 2x as wide as eye. Face 1.8x as wide as high, inner margin of eyes somewhat converging ventrally. Clypeus 1.66x as wide as high, its lower margin convex. Malar space as long as basal width of mandible [P2]. The head is transverse, roundly narrowed posteriorly. The temples are long [Te1]. The head is widened behind the eyes. Temples slightly longer than the transverse diameter of the eye. POL slightly smaller than OOL, almost half the diameter of the ocellus. Face width 1.8 times its height. The malar height is equal to the basal width of the mandible [T14]. Head is dorsally somewhat enlarged after the compound eye, temple is about twice the length of the compound eye; the face width is 1.8 times its height; the malar space is the same length as the mandible width [Zh1]. head almost cubical [S4].

sculptureHead densely rugulose, vertex and temple above transversely rugulose (Fig. 2) [P2]. Temples slightly rugose and striated [Te1]. Vertex transversely rugose behind ocelli [T14].

colorPalpi brown [P2]

antenna

shape ♀Antenna with 18 segments, above the middle somewhat dilated [Th]. Antenna about 0.25 shorter than body, with 19 antennomeres. Third segment 4x as long as broad, further segments indistinctly thickening so that penultimate segment 1.3x as long as broad [P2]. Antennae in ♀ 18-segmented, slightly widened in the middle [Te1]. Antennae one third shorter than body, 19-segmented; 3rd segment 4 times as long as wide, preapical segments 1.3 times [T14]. Female antennae 16 segments (see comment) [Zh1]. 18 segments, slightly dilated beyond the middle [M2].

shape ♂21 segments [Th][M2]. Antenna about 1/6 shorter than body, with 21 - 22 segments. penultimate flagellomere 1.5x as long as broad [P2]. 21-segmented, filiform, longer than the body [Te1].

colorFlagellum blackish [P2].

mesosoma

shapeMesosoma in lateral view somewhat short, 1.3x as long as high [P2][T14][Zh1]. The propodeum with 2 teeth on the sides [Te1].

sculptureMesosoma densely rugose, scutellum rugulose [P2]. Mesonotum densely punctate. The propodeum is coarsely reticulate-rugose [Te1]. Mesonotum densely rugose-punctate, scutellum with finer sculpture [T14]. Scutellum matt, very densely punctated [M2].

color

legs

shapeHind femur 3.5 - 3.66x as long as medially broad. Inner spur of hind tibia 0.5 as long as basitarsus. Hind basitarsus as long as tarsomeres 2-4 [P2]. Hind femur 3.5 times as long as wide. Inner spur of the hind tibia equal to half the length of the 1st segment of the hind tarsus [T14].

sculpture

colorHind tibiae in middle widely yellowish, fore coxae yellowish [?][Th]. Coxae blackish, trochanters and femora brownish, distal half of fore femur and tibiae 1-3 yellow, hind tibia blackish, tarsi brownish fumous [P2]. ♀: The legs are black; fore tibia entirely, middle and hind tibia reddish yellow in the middle [Te1]. The legs are brown.The hind femora are brown. Apical half of hind femur and all tibiae brownish yellow, but hind tibia darker. ♂: Hind tibia entirely dark-colored or with poorly developed yellowish pattern [T14]. Fore tibiae, much of the middle of hind tibiae and trochanters reddish-yellow [M2].

wings

shapeFore wing shorter than body. Pterostigma (figs.9 - 10) 2.66 - 3.0x as long as wide, issuing radial vein distally from its middle: r short, 0.6x as long as 3-SR, SR1 straight and apically slightly incurved. R1 0.25x shorter than pterostigma, 1-R1 0.6 - 0.7x as long as pterostigma. ♂: r shorter than or same length as 3-SR [P2]. 1-R1 0.6 times as long as pterostigma [T14]. 1-R1 0.62 times pterostigma length [Zh1].

colorWings faintly fumous, pterostigma opaque brownish, veins proximo-distally opaque yellowish to brownish. Tegula brown [P2]. The wings are light; the stigma is brown [Te1]. The wings are darkened [T14].

metasoma

shape♀ Carapace in dorsal view (Fig. 3) 1.9 - 2.0x as long as medially broad; in lateral view (Fig. 5) 2.9x as long as posterior height, apically with a small median tubercule; in ventral view apically somewhat incurved. Pair of converging basal keels short. ♂: Carapace in dorsal view (Fig. 7) 1.95-2.1 x as long as broad somewhat posteriorly from middle [P2]. Metasoma elongated, slightly compressed laterally towards apex [Te1]. Metasoma widened toward posterior third, with a small apical tubercle; length 1.9 times its width [T14]. Metasoma long oval, 1.9 times as long as wide, in lateral view 2.9 times as long as high. In lateral view a small protrusion in the middle of the end of the metasoma [Zh1].

sculptureCarapace almost evenly, relatively rougly rugose, i. e. sculpture posteriorly indistinctly weakening (Fig. 3) [P2]. Metasoma not coarsely rugose [Te1]. Metasoma with reticulate shallow rugae [Zh1].

color

♀ ovipositorOvipositor sheath concealed [P2]. Ovipositor sheath is short, hidden under the metasoma [Zh1].

♂ apertureApical foramen of carapace small and less elliptic, 1.6-1,7x as wide as high (Fig. 8) [P2]. Without clearly visible opening in ♂ at apex of carapace [Te1]. Aperture small, 0.1–0.15 times the width of the metasoma [T14]. Aperture round [Zh1].

other info

distributionSE [FE].

remarksChelonus mucronatus (Thomson) is very close and similar to C. atripes (Thomson, 1874) [P2]. Except for the 16 segments of female antennae (19 segments of the type specimen) are the rest of the characteristics consistent with the type, so they are determined to be the same species [Zh1].

hosts

figures

fig. 1: Head in dorsal view with indication of its sculpture. (Papp 1997a)	fig. 2: Head in lateral view (Papp 1997a)	fig. 3: Carapace of female in dorsal view with indication of its sculpture (Papp 1997a)
fig. 4: Carapace of female in dorsal view (Papp 1997a)	fig. 5: Carapace of female in lateral view (Papp 1997a)	fig. 6: Hind femur (Papp 1997a)
fig. 7: Carapace of male in dorsal view. (Papp 1997a)	fig. 8: Posterior end of male carapace with aperture (Papp 1997a)	fig. 9: distal part of right fore wing (Papp 1990)
fig. 10: distal part of right fore wing (Papp 1990)	fig. 11: head, dorsal view (Tobias 2010)	fig. 12: head, frontal view (Tobias 2010)
fig. 13: ♂ metasoma, dorsal view (Tobias 2010)	fig. 14: ♂ metasoma, lateral view (Tobias 2010)	fig. 15: ♂ metasoma, posterior view (Tobias 2010)

references

code	reference	type of info
M2	Marshall 1889	d
P2	Papp 1997a	Rk9k10f
P4	Papp 1990	f
S4	Szepligeti 1898	k
Te1	Telenga 1941	dk
Th	Thomson 1874	T
T14	Tobias 2010	dkf
T4	Tobias 1986	k
Zh1	Zhang 2008	dk
FE	van Achterberg 2021	Fauna Europaea
legend:	Type description \| Redescription \| description \| in key \| comment \| nom. nov. \| figure(s) \| photo(s)

links

Fauna Europaea

photos

type description

Thomson 1874

23. C. mucronatus n. sp: Niger, subopacus, tibiis posterioribus medio late, anticis genubusque luteis; femina antennis supra medium subdilatatis; mas antennis 21-articulatis. Long 4 - 5 mill.

Praecedenti simillimus, pedibus alarumque nervis cum stigmate dilutioribus, genis magis productis; femina antennis longioribus et validioribus, supra medium dilatatis, 18-articulatis, abdomine apice subcompresso, interdum quasi mucronato-compresso; mas antennis 21-articulatis mox discedens.

Temligen sallsynt i Skane och pa Gottland.

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):	(2.6) 2.6 - 3.2 (3.4)	(2.6) 2.6 - 3.2 (3.4)
number of antennal segments:	(16) 16 - 19	21 - 22
head, dorsal view
Head width : length	narrow, wide	narrow, wide
Temples narrowing - widening	parallel, widening	parallel, widening
Eye length : temple length	0.75 - 1.0	0.75 - 1.0
Roundness temple	very strong	very strong
POL : OD	2 - 3, 3 - 4	2 - 3, 3 - 4
Ocellar triangle shape	very narrow, narrow	very narrow, narrow
Excavation of head	15 - 25%	15 - 25%
head, lateral view
Head height : length	very short	very short
Eye height : length	long, very long	long, very long
Temple length : eye length	very long	very long
head, frontal view
Head width : height	wide	wide
Face width : height	narrow, wide	narrow, wide
Eyes converging ventrally	about parallel	about parallel
EH : MSL	short	short
Clypeus width : height	semicircular, transverse	semicircular, transverse
Clypeus extending above bottom of eyes	below	below
Tentorial pits	large, very large	large, very large
Shape of lower margin clypeus	convex, truncate	convex, truncate
antennae
Antennal shape	slightly widened	filiform, not widened
Segment 3 length : width	long	---
Penultimate segment length : width	short, medium	medium
Length of antenna : length of body	3: long	3: long, 4: very long
mesosoma, lateral view
Length : height	short	short
transverse carina	---	---
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	---	---
Hind tibia (longest) spur length : metatars length ratio	long	long
wings
Vein 1-R1 length : pterostigma length	short, medium	short, medium
Vein r length : vein 3-SR length	short	short
Shape vein SR1 (straight / concave / convex)	convex	convex
S-shape vein SR1	not S-shaped, apically convex	not S-shaped
cell M : cell Sm2	Sm2 large, Sm2 medium	Sm2 large, Sm2 medium
Pterostigma length : width ratio	medium, long	medium, long
Angle between radial vein (r) : vein 1-R1	medium	medium
metasoma, dorsal view
Length : width ratio of metasoma	medium, long	medium, long
Shape of metasoma	widest in middle, widest towards apex	widest in middle, widest towards apex
metasoma, lateral view
Length : height ratio of metasoma	medium	medium
posterior : anterior height ratio of metasoma	small, medium	small, medium
Position of maximum height	medium-posterior, posterior	medium-posterior, posterior
metasoma, ventral view
Metasoma posteriorly curved forwards	just/slightly incurved	just/slightly incurved
male apical aperture
Aperture width : metasoma width	no aperture	small
Aperture shape	n. a.	(nearly) round, oval
Median process shape	n. a.	vertical carina
sculpture
head
general coarseness	fine	fine
clypeus
coarseness punctation	---	---
density punctation	---	---
face
sculpture type	rugose	rugose
sculpture direction	---	---
vertex and temple
sculpture type	transverse rugulose	transverse rugulose
mesonotum
sculpture type	---	---
scutellum
middle	rugulose	rugulose
lateral	rugulose	rugulose
metasoma
base - mid sculpture	rugose / reticulate	rugose / reticulate
sculpture at apex	rugose, rugulose	rugose, rugulose
coarse / fine boundary	---	---
color
head
mandibles color pattern	---	---
palpi, lightest color	brown, red	brown, red
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	light	light
fore femur color pattern	tip light, base dark	tip light, base dark
hind femur lightest colour	dark, medium dark, medium light	dark, medium dark, medium light
hind femur color pattern	entirely dark, tip light	entirely dark, tip light
hind tibia lightest colour	medium light	dark, medium light
hind tibia color pattern	wide light ring	entirely dark, narrow light ring
hind basitarsus lightest colour	medium dark	medium dark
hind tarsus segment 2-3 lightest colour	medium dark	medium dark
wings
middle veins lightest colour	medium light	medium light
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 mucronatus in published keys

T4: Tobias, 1986

Key to the Insects of the European Part of the USSR Volume III. Hymenoptera. Part four. Chapter 16

P2: Papp, 1997a

Revision of the Chelonus s. str. species described by C. G. Thomson (Hymenoptera: Braconidae, Cheloninae)