Paraxenopygus, Chatzimanolis & Brunke & Navarrete-Heredia, 2024

Chatzimanolis, Stylianos, Brunke, Adam J. & Navarrete-Heredia, José L., 2024, A review of Paraxenopygus Bernhauer (Insecta: Coleoptera: Staphylinidae), with description of two new species, Journal of Natural History 58 (37 - 40), pp. 1509-1528 : 1526

Key to the species of Paraxenopygus

1. Head and pronotum bright metallic black-blue or dull grey-black with blue overtones ( Figure 2A–B ); abdominal tergites 3–4 with a faint curved line posterior to anterior transverse basal line ( Figure 4H ) ................................................................................................... 2

- Head and pronotum shining metallic green to metallic bronze ( Figure 2C–D ); abdominal tergites 3–4 without a faint curved line posterior to anterior transverse basal line ......... 3

2. Antennomeres 1–5 without tomentose pubescence ( Figure 4F ); head and pronotum bright metallic black-blue ( Figure 2A ); pronotum with clearly separated rows of setose punctures ( Figure 2A ); metacoxal shield elongate and narrow ( Figure 3A ); paramere slightly longer and narrower than median lobe (except apically) ( Figure 5A ); and median lobe in lateral view becoming narrower, with thin apex ( Figure 5C ) ................... .............................................................................................. Paraxenopygus tremolerasi Bernhauer

- Antennomeres 1–4 without tomentose pubescence ( Figure 4G ); head and pronotum dull grey-black with blue overtones ( Figure 2B ); pronotum with rows of setose punctures confused and nearly becoming evenly distributed ( Figure 2B ); metacoxal shield short and wide ( Figure 3B ); paramere shorter and much narrower than median lobe ( Figure 5D ); and median lobe in lateral view becoming narrower only near apex ( Figure 5F ) .......... .......... P. maurocyanos Chatzimanolis, Brunke and Navarrete-Heredia

3. Head and pronotum metallic bronze ( Figure 2E ); abdominal tergites each with large median and smaller lateral dark spots ( Figure 1E ) ........ ........ P. opacipennis Bernhauer

- Head and pronotum metallic green ( Figure 2C–D ); abdominal tergites 3–5 with dark spots as above; typically abdomen orange-brown but some specimens can be darker ( Figure 1C–D ) ......................................................................................................................................... 4

4. Pronotum with sparse setose punctures in discrete rows ( Figure 2D ); tergite 7 with dark median spot ( Figure 1D ); aedeagus much smaller than in other species ( Figure 5J–L ); apex of median lobe in ventral view broadly rounded ( Figure 5J ); median lobe in lateral view without subapical tooth ( Figure 5L ) .......................................... ....................................................... P. newtoni Chatzimanolis, Brunke and Navarrete-Heredia

- Pronotum with dense setose punctures in confused rows, nearly evenly distributed ( Figure 2C ); tergite 7 with dark median band ( Figure 1C ); aedeagus similarly sized to most species ( Figure 5G–I ); apex of median lobe in ventral view converging to narrow rounded tip ( Figure 5G ); median lobe in lateral view with subapical tooth ( Figure 5I ) ........................................................................................................................ P. peruvianus Bernhauer

Figures

Figure 1. Habitus of: (A) Paraxenopygus tremolerasi Bernhauer; (B) P. maurocyanos sp. n.; (C) P. peruvianus Bernhauer; (D) P. newtoni sp. n.; (E) P. opacipennis Bernhauer.

Figure 2. Forebody of: (A) Paraxenopygus tremolerasi Bernhauer; (B) P. maurocyanos sp. n.; (C) P. peruvianus Bernhauer; (D) P. newtoni sp. n.; (E) P. opacipennis Bernhauer; (F) Glenus coxalis Sharp; (G) G. kraatzi Sharp; (H) G. jelskii Solsky.

Figure 3. (A–E) Metacoxal shield (arrow); (F–H) maxillary palpus with apical segment (arrow). (A) Paraxenopygus tremolerasi Bernhauer; (B) P. maurocyanos sp. n.; (C) P. peruvianus Bernhauer; (D) P. newtoni sp. n.; (E) P. opacipennis Bernhauer; (F) P. newtoni sp. n.; (G) G. condei Wendeler; (H) G. setosus Sharp.

Figure 4. (A–E) Terminal abdominal sternites, including porose structure (arrow); (F–G) antenna; (H) basal abdominal tergites with curved lines (arrow). (A) Paraxenopygus tremolerasi Bernhauer; (B) P. maurocyanos sp. n.; (C) P. peruvianus Bernhauer; (D) P. newtoni sp. n.; (E) P. opacipennis Bernhauer; (F) P. tremolerasi; (G) P. maurocyanos sp. n.; (H) P. tremolerasi.

Figure 5. (A, C, D, F, G,I, J, L, M, O) Aedeagus in ventral (A, D, G, J, M) and lateral view (C, F, I, L, O); (B, E, H, K, N) apex of paramere, ventral view. (A–C) Paraxenopygus tremolerasi Bernhauer; (D–F) P. maurocyanos sp. n.; (G–I) P. peruvianus Bernhauer; (J–L) P. newtoni sp. n.; (M–O) P. opacipennis Bernhauer. Scale bars = 1 mm (A, C, D, F, G, I, J, L, M, O); 0.5 mm (B, E, H, K, N).