Xanthopygus Kraatz, 1857 sensu novo

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

Xanthopygus Kraatz, 1857 sensu novo

Figs 1D-E

Type species.

Staphylinus xanthopygus Nordmann, 1837, fixed by absolute tautonymy ( Herman 2001).

Species included.

Xanthopygus cognatus , Xanthopygus giganteus , Xanthopygus luctuosus , Xanthopygus major , Xanthopygus max , Xanthopygus oliveirae , Xanthopygus pexus and Xanthopygus xanthopygus . (see Table 1 for complete names and Herman 2001 for taxonomic history).

Diagnosis.

This genus can be distinguished from all other genera in Xanthopygina based on the combination of the following characteristics: head shape rectangular; head wider than pronotum (apomorphy; however, head size can be variable among specimens of the same species but wider than pronotum); antennomeres 7-10 transverse; left mandible with two teeth separated by deep emargination (apomorphy); labial palpomere 3 not securiform; small size eyes (apomorphy); superior marginal line of pronotal hypomeron not continuing to anterior margin; superior and inferior marginal line of hypomeron produce anterolateral angles not parallel to one other (apomorphy); postcoxal process present; elytra coloration black (except with blue metallic overtones in Xa. xanthopygus ); dorsal 1/3 of metepisterstum without punctures (apomorphy; state also present in Ph. mirabilis ); with more than four spines on the posterior surface of metacoxae (apomorphy; less than four in Xa. xanthopygus ); tergites 3-5 with arch-like carina; and sternite 7 in males with emargination at posterior margin. For a list of characters that distinguish Xanthopygus from Photinopygus , see Table 2 .

Remarks.

A formal revision of the genus is forthcoming (Chatzimanolis in preparation) where all species belonging to this genus will be treated and illustrated.

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).