Chelonus (Megachelonus) macrodontus, Zhou & Achterberg & Tang & Chen, 2022

Zhou, Jin-Jin, Achterberg, Kees Van, Tang, Pu & Chen, Xue-Xin, 2022, A review of the subgenera Arichelonus, Megachelonus and Scabrichelonus of the genus Chelonus Panzer (Braconidae: Cheloninae) with description of five new species from China, Zootaxa 5165 (4), pp. 527-547 : 538-540

Chelonus (Megachelonus) macrodontus sp. nov.

Figs 9–10

Material examined. Holotype: female, China, Yunnan Prov., Tongbiguan , 23.VI.2005, Jinxian Liu, No. 200609605( ZJUH).

Diagnosis. This species differs from the other species in the subgenus Megachlonus by having a pair of long and large teeth at apex of metasomal carapace ( Figs 10G, 10H ).

Description. Holotype, female, length of body 5.3 mm, of fore wing 3.9 mm.

Head. Antennomeres 28 (remaining, broken in holotype), basal half of antenna distinctly broadened, then rapidly tapering to apex; third antennomere 1.3 × longer than fourth; third, fourth and terminal antennomeres 4.7 ×, 3.7 × and 3.2 × longer than wide, respectively; 9-20 th antennomeres flattened, distinctly shorter than wide; head transverse, in dorsal view roundly contracted behind eyes; OOL: OD: POL= 15: 6: 10; longitudinal diameter of eye 2.0 × height of temples; vertex coarsely striate-rugose; frons distinctly concave, reticulate-rugose but smooth near antennal sockets; temple irregularly reticulate-rugose ( Fig. 10E ); face coarsely reticulate-rugose with longitudinal elements, clypeus flat and densely punctate, smooth and shining, length of malar space 1.6 × basal width of mandible ( Fig. 10D ); face densely setose in lateral view ( Fig. 10F ).

Mesosoma. Length of mesosoma 1.4 × its height; mesoscutum areolate-rugose, but smooth and shiny medially; scutellum punctate medially, rugose laterally; scutellar suture comparatively deep; mesopleuron evenly convex, coarsely reticulate-rugose ( Fig. 10B ); propodeum coarsely reticulaterugose, with a distinct transversal carina connected with 4 blunt tubercles, lateral tubercles larger than medial ones ( Fig. 10C ).

Wings. Length of fore wing 2.7 × its width; length of marginal cell 0.8 × pterostigma; vein 2-Rl just present, vein r shorter than 3-SR; r: 3-SR: SRl = 1: 1: 5; SRl more or less curved; parastigma distinctly swollen; 1-CU1: 2- CU1= 1: 2; vein CUlb present ( Fig. 10A ).

Legs. Hind coxa densely short setose and striate-rugose; hind femur robust; length of hind femur, tibia and basitarsus 3.2 ×, 4.5 × and 6.4 × their maximum width, respectively.

Metasoma. Carapace elongate-oval in dorsal view, coarsely reticulaterugose basally, longitudinal striate-rugose medially, densely reticulaterugose apically; length of carapace 2.4 × its maximum width in dorsal view ( Fig. 10H ); ventral cavity (as a narrow channel) open to apex, with a pair of long and large teeth; ovipositor long, slender and the ovipositor sheath 0.16 × as long as fore wing, 0.44 × as long as hind tibia ( Figs 10G, 10H ).

Colour. Black; antennomeres blackish-brown; basal half of clypeus reddish-brown; pterostigma and veins blackish-brown; fore wing more or less infuscate; basal third of carapace yellowish; legs almost entirely yellowishbrown, hind tibia light yellow basally and black apically; ovipositor sheath brown.

Male. Unknown.

Biology. Unknown.

Etymology. From macro (Greek for long) and odontos (Greek for teeth), because of the apex of the metasomal carapace bears a pair of long teeth.

Figures

FIGURE 9. Chelonus (Megachelonus) macrodontus sp. nov., female, holotype, habitus, lateral aspect.

FIGURE 10. Chelonus (Megachelonus) macrodontus sp. nov. female, holotype. A, fore wing; B, mesosoma, lateral aspect; C, mesosoma, dorsal aspect; D, head, anterior aspect; E, head, dorsal aspect; F, head, lateral aspect; G, metasoma, lateral aspect; H, metasoma, dorsal aspect.