Istiochrysis Rosa & Xu
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publication ID |
https://doi.org/ 10.11646/zootaxa.4111.5.5 |
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publication LSID |
lsid:zoobank.org:pub:C4F0DD2F-4230-4E05-8236-CFE78DDF26EE |
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DOI |
https://doi.org/10.5281/zenodo.6060786 |
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persistent identifier |
https://treatment.plazi.org/id/03920914-FFC4-D359-68A3-FD75FC122EED |
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treatment provided by |
Plazi |
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scientific name |
Istiochrysis Rosa & Xu |
| status |
gen. nov. |
Istiochrysis Rosa & Xu , gen. nov.
( Figs 1A–1 View FIGURE 1 A – 1 F F, 2A–2D, 3A–3D, 4A–4F)
Type species: Istiochrysis ziliolii Rosa, Feng & Xu , sp. nov.
Diagnosis. Istiochrysis Rosa & Xu , gen. nov. is similar to the Nearctic and Neotropical genus Caenochrysis Kimsey & Bohart, 1981 , and the Palaearctic and Oriental genera Chrysidea Bischoff, 1913 and Trichrysis Lichtenstein, 1876 . However, this new genus can be separated from Caenochrysis , Chrysidea and Trichrysis by male genitalia with extended longitudinal crest on aedeagus ( Figs 1A–1 View FIGURE 1 A – 1 F C); apex of aedeagus enlarged and folded laterally ( Figs 1A, 1 View FIGURE 1 A – 1 F B) (not enlarged in the other genera and tapering in Caenochrysis ); facial fovea between antennal socket and lower margin of eye hardly visible and shallowly depressed and finely punctate ( Figs 2A, 2 View FIGURE 2 A – 2 D B) (usually deeply depressed in Caenochrysis ); pronotum without sublateral carina ( Fig. 3A View FIGURE 3 A – 3 D. A ) (usually with sublateral carina in Trichrysis ); fore wing discoidal cell with thin and completely sclerotised outer vein (faint in Chrysidea ); apex of T3 without teeth (laterally dentate and medially undulate in Chrysidea , tridentate in Trichrysis ); S2 with large, subrectangular, black spots extending to lateral margins ( Fig. 3 View FIGURE 3 A – 3 D. A B), somehow similar to those in the genus Praestochrysis Linsenmaier, 1968 (small, suboval, not extending to lateral margins in Caenochrysis ; suboval and separated in Chrysidea ( Fig. 3 View FIGURE 3 A – 3 D. A D), subtriangular and medially fused or nearly so in Trichrysis ( Fig. 3 View FIGURE 3 A – 3 D. A C)) ( Bohart & Kimsey 1982; Linsenmaier 1984; Rosa & Xu 2015; Rosa et al. 2016a) ( Fig. 2 View FIGURE 2 A – 2 D D).
Description. Male. Head broader than high. Scapal basin with shallow depression on each side between antennal socket and lower margin of eye; depression visible only under certain angle ( Figs 2A, 2 View FIGURE 2 A – 2 D B); bottom of depression filled with micro-punctures and densely setose. Scapal basin topped by TFC ( Figs 2A View FIGURE 2 A – 2 D , 4 View FIGURE 4 A – 4 F B); scapal basin with white setae, especially along lateral sides ( Fig. 2A View FIGURE 2 A – 2 D ). F1 l/w>3; MS=1 MOD. Genal carina developed from gena to mandible. Subgenal area well defined. Median ocellus not lidded. Vertex without posterior depression beneath posterior ocellus. Mandible unidentate. Pronotum nearly as long as mesoscutellum with deep lateral depression, without sublateral carina. Mesopleuron with large episternal sulcus and scrobal sulcus ( Fig. 4 View FIGURE 4 A – 4 F D); area between episternal sulcus and scrobal sulcus large and subtriangular. Metanotum with raised median area. Fore wing with thin but completely sclerotized outer veins of discoidal cell ( Fig. 3A View FIGURE 3 A – 3 D. A ). T2 and T3 with shallow median longitudinal carinae ( Fig. 4 View FIGURE 4 A – 4 F E). Apex of T3 without teeth, but with shallow concavity, thus appearing bilobate ( Fig. 4 View FIGURE 4 A – 4 F F); pit row well developed with enlarged and partly fused pits ( Fig. 4 View FIGURE 4 A – 4 F F). Black spots on S2 elongate, fused along lateral margins ( Fig. 3 View FIGURE 3 A – 3 D. A B) and distinctly separated mesally. Male genitalia with gonostyle of gonocoxa elongate and slender, aedeagus with enlarge longitudinal crest, well visible in lateral view ( Fig. 1 View FIGURE 1 A – 1 F C).
Female. Unknown.
Biology. Unknown.
Distribution. China (Yunnan).
Etymology. From Greek noun istion (= sail), referring to the unique subsidiary structure longitudinally placed on aedeagus, looking like a sail in lateral view. The gender is feminine.
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.