Chelonus (Microchelonus) scirpophagae, Zhou & Achterberg & Tang & Chen, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5412.1.1 |
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publication LSID |
lsid:zoobank.org:pub:DB6DD20F-6EB7-4152-AC80-2F67EE06684B |
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DOI |
https://doi.org/10.5281/zenodo.10676094 |
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persistent identifier |
https://treatment.plazi.org/id/2B5587AD-F05E-732B-FF39-6ED5FCC4BD00 |
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treatment provided by |
Plazi |
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scientific name |
Chelonus (Microchelonus) scirpophagae |
| status |
sp. nov. |
Chelonus (Microchelonus) scirpophagae sp. nov.
Figs 71–72 View FIGURE 71 View FIGURE 72
Material examined. Holotype: male, Guixian County, Guangxi Prov., China, 1.X.1979, Zhihong Zhou, No. 821370 ( ZJUH). Excluded from type series: 1 male, Yuanmou Yunnan Prov., China, 1.IV.1980, Jiasheng Gan, No. 814233, reared from Scirpophaga incertulas .
Diagnosis. This new species is similar to the male of C. (M.) clivus sp. nov. ( Fig. 21 View FIGURE 21 ), sharing the carapace with a large yellowish spot medio-basally and carapace widest after middle in dorsal view, but the two species can be separated by the following characters: apical aperture in posterior view very large, the upper corner of carapace triangularly projecting ( Fig. 72F View FIGURE 72 ) (versus apical aperture oval and carapace without any projection dorso-apically in C. (M.) clivus ( Fig. 22F View FIGURE 22 )); face smooth and very shiny ( Fig. 72G View FIGURE 72 , holotype) or very finely reticulate-rugulose in reared specimen (versus transverse-longitudinally striate-rugose ( Fig. 22G View FIGURE 22 )); temples distinctly widened behind eyes ( Fig. 22H View FIGURE 22 ) (versus narrowed ( Fig. 22H View FIGURE 22 )).
Description. Holotype, male, length of body 5.1 mm, of fore wing 3.8 mm.
Head. Head transverse, width of head 1.7 × its dorsal length; occiput hardly excavated; antenna largely missing; eye 1.6 × as long as temple in dorsal view; OOL: OD: POL=25: 11: 11; temple strongly narrowed behind eyes; frons and vertex smooth and shiny ( Fig. 72H View FIGURE 72 ); face flat, smooth and shiny, width of face 1.6 × its height; eyes slightly diverging; clypeus smooth and extending far above lower level of eyes, interspaces shiny, apical margin convex medially, clypeus 1.5 × wider than high, distance between tentorial pits 1.9 × distance between pits and eyes ( Fig. 72G View FIGURE 72 ).
Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum sparsely punctate; mesopleuron completely coarsely reticulate-rugose ( Fig. 72B View FIGURE 72 ); notauli slightly impressed, mesoscutum densely alveolate-rugose; scutellum rugulose; scutellar suture comparatively deep, with short carinae; propodeum coarsely rugose, tubercles small and acute ( Fig. 72C View FIGURE 72 ).
Wings. Vein r somewhat arched; length of marginal cell 0.7 × as long as pterostigma; pterostigma length 3.6 × its width; r: 3-SR: SR1=14: 22: 66; SR1 slightly sinuate; marginal cell 1.7 × longer than submarginal cell; 1-CU1: 2-CU1= 26: 54 ( Figs 72A View FIGURE 72 ).
Legs. Hind coxa punctate; length of hind femur, tibia and basitarsus 3.1 ×, 5.4 × and 6.0 × their maximum width, respectively; length of inner hind tibial spur 0.5 × hind basitarsus.
Metasoma. Length of carapace 2.0 × its maximum width, widest after middle and apical fifth distinctly narrowed; basal half of carapace reticulate-rugose up to middle, densely punctate apically ( Fig. 72E View FIGURE 72 ); carapace in lateral view 2.8 × longer than high, posterior height of metasoma 1.8 × its anterior height, carapace apically distinctly incurved ( Fig. 72D View FIGURE 72 ); apical aperture in posterior view very large and 2.4 × wider than high, elongate, broadly slit-shaped, in lateral view wide triangular up to apical 1/4 metasoma ( Fig. 72D View FIGURE 72 ), upper corner of carapace triangularly projecting ( Fig. 72F View FIGURE 72 ).
Colour. Black; palpi brown; pterostigma and parastigma dark brown, wing and its veins dark brown, legs dark brown, but fore femur brown; metasomal carapace with yellowish band but corners black.
Female. Unknown.
Variation. Face of non-type specimen very finely reticulate-rugose and with satin sheen; frons and vertex very finely transversely rugose, occiput slightly excavated.
Biology. Solitary ovo-larval parasitoid of the rice yellow stem borer or Scirpophaga incertulas (Walker, 1863) ( Lepidoptera , Crambidae ). The biology of the reared specimen is mentioned in the publication “Identification of Natural Enemies of Rice Pests in Yunnan ” published in 1986, where this species was included as Chelonus sp. It is the first record of a Chelonus species as parasitoid of this host.
Distribution. China (Guangxi, Yunnan).
Etymology. The name refers to the genus of its host.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.