home species list Chelonus bidentulus
Chelonus bidentulus
authorThomson 1874
synonyms
body
shape6-7 mill. (= 3.3-4.5 mm?) [Th]. ♀ 4.3-4.8 mm, ♂ 4.7-4.8 mm [P1]. 6-7mm [M2][Te1].
colorblack [Th].
head
shapeTemples slightly rounded [Th]. Head in dorsal view (Fig. 1) 2x as broad as long, eye 1.4x as long as temple, latter constricted, occiput excavated. Ocelli small, somewhat elliptic, distance between fore and hind ocelli longer than diameter of hind ocellus, POL:OD:OOL as 10:4:14. Eye in lateral view (Fig. 9) 1.75x as high as wide, temple as wide as eye. Malar space 1/3 longer than basal width of mandible. Face just less than 2x as wide as high, inner margin of eyes parallel. Clypeus less wide than face, distinctly 2x as wide as high, distance between tentorial pits 1/6 longer than that between pit and lowest point of eye [P2].
sculptureTemples weakly striate, without rugae [Th]. Face transversely strio-rugose; clypeus medially densely punctate, laterally with more or less confluent punctation, interspaces shiny. Head above rugose, temple striate with anastomosis [P2]. Temple slightly rugose-striate [Te1].
color
antenna
shape ♀Length of antenna exceeding mesosoma, past the middle dilated [Th]. Antenna about as long as head and mesosoma combined, with 28 antennomeres. Third segment 1.6x as long as broad and penultimate segment cubic [P2]. Antennae longer than head and thorax, thickened behind middle, 24-27-segmented [Te1].
shape ♂
color
mesosoma
shapeAnterior margin of acetabulum bidentate and reflexed. Propodeal teeth sharp but short [Th]. ♀ Mesosoma in lateral view 1.66x as long as high. Notaulix distinct by rough sculpture. Lateral pair of propodeum spiky, median pair hardly distinct. Fore acetabulum (close behind fore coxae) unusually emerging lamelliform and slightly denticulate in shape (Fig. 3) [P2][P1]. The lateral margins of the mesosoma, behind the anterior coxae, are raised and bidentate. Propodeum with 2 teeth [Te1]. Teeth of the propodeum acute, but short [M2].
sculptureMesonotum slightly punctured, mesosternum finely and neatly punctured [Th]. ♀ Mesosoma areolate rugose, mesonotum rugose with small smooth and shiny fields, scutellum smooth and shiny. ♂: Scutellum smooth with fine and disperse punctation [P2].
color
legs
shapeHind femur 3.5x as long as broad medially; pair of spurs of hind tibia subequal, inner spur 0.5 as long as basitarsus. Hind tibia and tarsus equal in length, hind basitarsus as long as tarsomeres 2-4 [P2].
sculpture
colorFront femora and tibiae yellow-brown, posterior with brown-black apex and base [Th]. Legs black; femora apically, tibiae and basitarsi yellow, hind tibia basally and apically, basitarsi apically and tarsomeres 2-5 (of every leg) brownish [P2].Legs are black; fore tibia entirely reddish yellow in the middle [Te1]. Apex of hind tibia and a ring near the base blackish [M2].
wings
shapeHind wing radius bent [Th]. Fore wing 0.25 shorter than body. Pterostigma (Fig. 4) 2.3 - 2.7 as long as wide issuing radial vein (r) distally from its center, R1 longer than pterostigma; 1-R1 shorter than pterostigma, r somewhat shorter than 3-SR, SR1 almost straight (i.e., indistinctly arched) and ending far before tip of wing. ♂ r almost as long as 3-SR [P2].
colorFore wings before stigma yellowish-brown, ♂ before stigma darker [Th]. Wings subhyaline, pterostigma brown, veins proximally opaque yellowish, distally opaque brownish [P2]. The wings are slightly smoky; the stigma is brown [Te1]. Parastigma yellow-brown [M2]. Tegula brownish black [P2].
metasoma
shapeMetasoma sub-oval, apex shortly incurved [Th]. Carapace in dorsal view (Fig. 5) elongate oval, 1.7- 1.8x ,[in figure 5 2.0x!] (♂ 1.8 - 1.9x) as long as broad medially; in lateral view (Fig. 6) 2.3x as long as high posteriorly; in ventral view apically incurved, i.e., ventral opening of carapace shorter than carapace itself (Fig. 7). ♂ carapace somewhat less broadening [P2]. Metasoma elongate-ovate, notched ventrally at apex [Te1]. Fairly elongated carinae [M2].
sculptureCarinae quite long [Th]. Carapace densely-longitudinally rugose (Fig. 5), posterior declivous part rugose to subrugose and here subshiny [P2].
color♀ with large pale yellow-brownish spots on both sides, ♂ without spots [Th][P2]. ♀ Metasoma with yellow spots at the base, ♂ without spots [Te1].
♀ ovipositorOvipositor concealed [Th]. Ovipostor sheath short [P2]. Short and straight [H2].
♂ aperture
other info
distribution
remarksCh. bidentulus Thomson is close to Ch. Bimaculatus [P2].
hosts