Platylabus Wesmael, 1845
publication ID |
https://doi.org/ 10.1080/00222933.2022.2134061 |
DOI |
https://doi.org/10.5281/zenodo.7397673 |
persistent identifier |
https://treatment.plazi.org/id/03DD87D3-FFF9-FFBD-55FD-967EFB06682A |
treatment provided by |
Plazi |
scientific name |
Platylabus Wesmael, 1845 |
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Platylabus Wesmael, 1845 View in CoL View at ENA
Platylabus Wesmael, 1845: 150 View in CoL .
Type species: Platylabus rufus Wesmael, 1845 View in CoL , by subsequent designation of Ashmead (1900a: 19).
Comparative diagnosis
The genus can generally be easily distinguished from Cyclolabus by the structure of the propodeal spiracles which are longer than wide ( Figure 19b View Figure 19 ). However, as already discussed (see Cyclolabus ), some small species of Platylabus approach a rather circular shape for the propodeal spiracles and can be difficult to tell apart from Cyclolabus species. In addition to the propodeal spiracle, Platylabus can be easily distinguished from all the other genera by the following characters: the apices of areae dentiparae are always without long apophyses (at the most with tooth-like projections, as in Figure 22b View Figure 22 ); the area superomedia is clearly defined ( Figure 5a View Figure 5 ) and not merging with area basalis as in Ambloplisus ( Figures 5c–5d View Figure 5 ); the gastrocoeli are transverse, deeply impressed, and usually considerably wider than the interval between them ( Figures 19a View Figure 19 , 20a, 20e View Figure 20 , 22a View Figure 22 ); the apex of the metasoma is always without white anal spots ( Figures 22a, 22d View Figure 22 , 26a, 26d View Figure 26 ); the mandibles are not twisted ( Heinrich 1977; Tereshkin 2009). For a full account of the differences between Platylabus and Tropicolabus , see under the latter genus.
Range and diversity
Platylabus has a worldwide distribution and with its 40 species in the Nearctic, it is the largest genus among Nearctic Platylabini . In the south-eastern United States, six species have been recorded so far ( Heinrich 1977; Yu et al. 2016).
Key to the species of Platylabus from the south-eastern United States (adapted from Heinrich (1962b) and Heinrich (1975))
Males of P. flavidoclarus Heinrich, 1977 and P. rubristernatus Heinrich, 1962 are unknown.
1. Female...................................................................................................................................... 2
- Male.......................................................................................................................................................... 8
2. Metasoma bright metallic blue ( Figure 22d View Figure 22 ) ........................................................................... 3
- Metasoma of different colour ( Figures 26d View Figure 26 , 28c View Figure 28 , 30c View Figure 30 , 32b, 32d View Figure 32 ) ..................................... 5
3. Postepetiole and hind femur with apical yellow bands; malar space yellow; sculpture of tergites fine .............................................................................. flavidoclarus Heinrich, 1977 View in CoL
- Postpetiole and hind femur without apical yellow bands ( Figure 22b View Figure 22 ); malar space not yellow marked ( Figure 22c View Figure 22 ); sculpture of tergites coarse........................................... 4
4. Flagellum distinctly to considerably widened beyond the middle ( Figures 22a, 22b View Figure 22 ) .......................................................................................................................... clarus ( Cresson, 1867) View in CoL
- Flagellum not at all widened beyond the middle.................. hyperetis Heinrich, 1962 View in CoL
5. Metasoma ferruginous, with yellow posterior bands on tergites 1–3 ( Figure 28c View Figure 28 )....... ................................................................................................................ ornatus ( Provancher, 1875)
- Metasoma black ( Figure 26d View Figure 26 ).......................................................................................................... 6
6. Coxae entirely black ( Figure 26b View Figure 26 )........................ opaculus View in CoL americanus Heinrich, 1962 View in CoL
- Coxae entirely ferruginous or sometimes with white spots, never with black markings ( Figures 30c View Figure 30 , 32b View Figure 32 )............................................................................................................. 7
7. Scutellum entirely white, convex, laterally not carinated except anteriorly ( Figure 32a View Figure 32 ); gastrocoeli less marked and not as distinctly wider than the interval between them as in the following species; reddish-orange colouration on the mesopleuron, metapleuron and mesosternum more extensive ( Figure 32b View Figure 32 ).............................................. .......................................................................................................... rubristernatus Heinrich, 1962 View in CoL
- Scutellum apically white and anteriorly black, carinate beyond the middle ( Figure 30a View Figure 30 ); gastrocoeli strongly marked, distinctly wider than the interval between them ( Figure 30a View Figure 30 ); reddish-orange colouration on the mesopleuron reduced to a spot in the postero-ventral corner ( Figure 30c View Figure 30 )............................................... ................................................................................................... rubricapensis ( Provancher, 1882) View in CoL
8. Metasoma bright metallic blue ( Figure 22d View Figure 22 )............................................................................ 9
- Metasoma of different colour ( Figures 26d View Figure 26 , 28c View Figure 28 , 30c View Figure 30 , 32b, 32d View Figure 32 )................................... 10
9. Outer orbits white from temple region down to base of mandibles, white colour gradually widening downward over most of the surface of apical part of cheeks; flagellum without annulus.................................................................... clarus ( Cresson, 1867) View in CoL
- Face and clypeus entirely white; flagellum with annulus.... hyperetis Heinrich, 1962 View in CoL
10. Metasoma ferruginous-red, with a yellow posterior band on tergites 1–3...................... ................................................................................................................ ornatus ( Provancher, 1875)
- Metasoma black................................................................................................................................. 11
11. Coxa III entirely or predominantly black; face black with inner orbit white .................... ........................................................................................... opaculus View in CoL americanus Heinrich, 1962 View in CoL
- Coxa III entirely or predominantly red or ferruginous; face either entirely white or black with inner orbits white .......................................................... rubricapensis Provancher, 1882 View in CoL
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Platylabus Wesmael, 1845
Dal Pos, Davide, Heilman, Victoria & Welter-Schultes, Francisco 2022 |
Platylabus
Wesmael C 1845: 150 |