Duplexissus Wang, Zhang & Bourgoin 2019
Creators: name: Wang, Menglin
name: Zhang, Yalin
name: Bourgoin, Thierry
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Issidae
Duplexissus

description: Genus: Duplexissus Wang, Zhang & Bourgoin, 2019, stat. rev. [valid genus]
syn. of Euroxenus Gnezdilov, 2009 in Gnezdilov (2020): 1300 [error]
Type species: Duplexissus punctatulus Wang, Zhang & Bourgoin, 2019, nom. rev. [valid name]
Euroxenus punctatulus (Wang, Zhang & Bourgoin, 2019): Gnezdilov, 2020: 1302 [error]
Since the paper by Wang et al. (2019) was published, we now have the COI sequence of Euroxenus vayssieresi, the type species of the genus, thanks to B. Reynaud and S. Nibouche (CIRAD, La Réunion) (GenBank reference MT318763). The molecular data of Euroxenus used in our molecular analysis, were also completed with partial 18S sequence (GenBank reference MN165789), D3–D5 and D6–D7 regions of 28S sequences (respectively referenced in GenBank as MN266995, MN266964) that were available in Gnezdilov et al. (2020).
The COI sequences of the two type species of the genera Duplexissus and Euroxenus differ by 121 bp (17.7%) of a total of 681bp, indicating clearly that the taxa belong to two different genera. The molecular analysis (Bayesian tree) based on combined genes (18S, 28S, COI and Cytb) also supports the validity of the genus Duplexissus, which appears as sister to the clade Euroxenus + Tetrichina (Fig. 25). Incidentally, the analysis also strongly supports the placement of Euroxenus within a monophyletic Sarimini, while it was shown as sister to Picumna, both genera sister to a new Issidae Issini clade (Thioniina + Issina) sensus Gnezdilov et al. (2020: fig. 1) strangely depicting a polyphyletic Sarimini.
Our molecular results are also confirmed by the morphological analysis showing Duplexissus differing from Euroxenus by several important characters: length of pronotum at middle slightly broader than vertex while obviously narrower than vertex in Euroxenus (Bonfils et al., 2001, fig. 18); forewing with costal margin slightly convex while strongly convex and curved in Euroxenus (Bonfils et al., 2001, fig. 22), ScP+RA single versus ScP+RA bifurcating basally in Euroxenus (Bonfils et al., 2001, fig. 22); hindwing with two terminals in MP but only one in Euroxenus (Gnezdilov, 2020, fig. 1), CuA-CuP being adjacent but separate apically while fully fused in one vein in Euroxenus (Gnezdilov, 2020, fig. 1); Pcu-A1 merging before mid-length of the wing but only in last third in Euroxenus (Gnezdilov, 2020, fig. 1) and A2 lobe wider than Pcu-A1 lobe while thinner in Euroxenus (Gnezdilov, 2020, fig. 1). These morphological characters should be added in the diagnosis and description of the genus Duplexissus (Wang et al., 2019) to avoid further confusion with Euroxenus, although they are easily seen by direct comparison of the figures provided.
description: Published as part of Wang, Menglin, Zhang, Yalin & Bourgoin, Thierry, 2020, Notes on genera of Sarimini with description of two new species in the genera Microsarimodes and Tetrichina (Hemiptera: Fulgoromorpha: Issidae), pp. 589-600 in Zootaxa 4858 (4) on page 598, DOI: 10.11646/zootaxa.4858.4.7, http://zenodo.org/record/4412743