Photinopygus Chatzimanolis, 2021

Chatzimanolis, Stylianos, 2021, Out of Xanthopygus (Coleoptera: Staphylinidae): escape from polyphyly, ZooKeys 1071, pp. 83-107 : 83

Photinopygus Chatzimanolis gen. nov.

Figs 1A-C

Type species.

Staphylinus calidus Erichson, here designated.

Species included.

Staphylinus alienus , Staphylinus apicalis , Staphylinus calidus , Staphylinus chapareanus , Staphylinus chrysopygus , Staphylinus chrysurus , Staphylinus corcovadoensis , Staphylinus cyanelytrius , Staphylinus cyanipennis , Staphylinus depressus , Staphylinus dimidiatus , Staphylinus elegans , Staphylinus faustus , Staphylinus flohri , Staphylinus haemorrhoidalis , Staphylinus hilaris , Staphylinus iopterus , Staphylinus janthinipennis , Staphylinus mirabilis , Staphylinus morosus , Staphylinus nigripes , Staphylinus punctatus , Staphylinus puncticollis , Staphylinus sapphirinus , Staphylinus tepidus , Staphylinus violaceipennis , Staphylinus violaceus and Staphylinus viridipennis (see Table 1 for complete names).

Diagnosis.

This genus can be distinguished from all other genera in Xanthopygina based on the combination of the following characteristics: head shape rectangular; posterior margin of head slightly extended posteriad on each side of the neck (apomorphy; except in Ph. corcovadoensis and Ph. mirabilis ); antennomeres 1-5 elongate; labial palpomere 3 not securiform; medium size eyes; superior marginal line of pronotal hypomeron not continuing to anterior margin; postcoxal process present; pronotum with sparse micropunctures but no transverse lines visible at 70 × magnification (apomorphy); mesoscutellum without dense micropunctures (apomorphy); mesoventral process narrow and rounded (apomorphy); metatarsi with setose dorsal surface (apomorphy); tergite 3 (at minimum, some species 3-4 or 3-5) with arch-like carina; and sternite 7 in males with emargination at posterior margin. For a list of characters that distinguish Photinopygus from Xanthopygus , see Table 2 .

Etymology.

The name is a combination of the Greek words φωτεινός (shining, bright) and πυγή (rump), and refers to the bright coloration of abdominal segments 7 and 8. The name is masculine.

Remarks.

A formal revision of the genus is forthcoming (Chatzimanolis in preparation) where all species belonging to this genus will be treated and illustrated. Even though some of the species transferred to Photinopygus were not included in the phylogenetic analysis, they can be confidently placed in this genus since they have all the diagnostic features of Photinopygus (see Tables 1 and 2 for details).

Figures

Figure 1. Habitus photographs of species of Xanthopygus sensu Herman 2001 A Xanthopygus calidus (Er.) B Xanthopygus chapareanus Scheerpeltz C Xanthopygus dimidiatus Bernhauer. Species A-C are transferred to Photinopygus gen. nov. D Xanthopygus giganteus (Bernhauer) E Xanthopygus xanthopygus (Nordmann) F Xanthopygus skalitzkyi (Bernhauer), transferred to Styngetus. Scale bars: 1.8 mm (A); 1.7 mm (B) 1.8 mm (C); 3.8 mm (D); 3.0 mm (E); 2.0 mm (F).