Paraxenopygus newtoni Chatzimanolis, Brunke and 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 : 1523-1524

Paraxenopygus newtoni Chatzimanolis, Brunke and Navarrete-Heredia , sp. n.

( Figures 1D , 2D , 3D , 4D , 5J–L , 6)

http://www.zoobank.org/ urn:lsid:zoobank.org:act:AB0B912B-D832-449F-AC9F-906DC787A79F

Type material

Holotype, here designated, male with labels: ‘ Brazil: Pará: Redenção vic., Kayapo Territory , Pinkaiti Field Station on Riozihno R. , 7°46.29 ʹ S, 51°57.65 ʹ W [−7.772°, −51.961°], xi.1998, tropical evergreen sea-’/‘seasonal lowland forest on clay soil, dung pitfall or flight intercept traps, P.Y Scheffler leg. Field Mus. Nat. Hist’./‘N.B: Any holotype based on this specimen to be deposited in Brazil: MZSP’/‘ Paraxenopygus n. sp. det. Newton 1999’/ ‘ FMNHINS4518409 ’/‘Holotype Paraxenopygus newtoni Chatzimanolis, Brunke and Navarrete-Heredia , des. Chatzimanolis, Brunke and Navarrete-Heredia 2024’. Currently in the collection of FMNH but will be deposited in MZSP per institutional agreement.

Diagnosis

Among species of Paraxenopygus with metallic green head and pronotum, P. newtoni can be distinguished from P. peruvianus by having a pronotum with sparse setose punctures in discrete rows ( Figure 2D ), tergite 7 with dark median spot ( Figure 1D ); aedeagus much smaller in size ( Figure 5J–L ), apex of median lobe in ventral view broadly rounded ( Figure 5J ) and median lobe in lateral view without subapical tooth ( Figure 5L ).

Description

Forebody length 7.3 mm. Colour of head and pronotum shining metallic green; mesoscutellum, elytra, antennae and legs orange-brown. Abdomen orange-brown except tergite 7 with circular dark brown to black area medially ( Figure 1D ) and sternite 7 with broad dark brown to black area medially ( Figure 4D ). Abdominal segments 5 and 6 with slightly darker areas medially. Epicranium ( Figure 2D ) with small to medium punctures, distance between punctures as wide as 1–2 punctures. Antennomere 1–4 without tomentose pubescence. Mandibles straight, except apically. Neck with sparse, small punctures. Pronotum width/length ratio = 1.08; pronotum with sparse medium-sized punctures; pronotum with discrete rows of punctures ( Figure 2D ); superior marginal line of pronotal hypomeron joins inferior marginal line before neck. Elytra length/pronotal length ratio = 1.25; elytra with small punctures and few wrinkled irregularities between punctures. Metacoxal shield short and wide, with tooth lateroposteriorly ( Figure 3D ); abdominal tergites 3–4 without faint curved line posterior to anterior transverse basal line. Sternite 7 in males with small circular porose structure ( Figure 4D ); sternite 8 with shallow V-shaped emargination ( Figure 4D ). Aedeagus as in Figure 5J–L , much smaller than other aedeagi in Paraxenopygus ; in ventral view paramere almost parallel-sided, converging to flat apex; paramere shorter and narrower than median lobe; in lateral view paramere parallel-sided, rounded near tip; paramere with peg setae in two short lateral rows as in Figure 5K . Median lobe in ventral view wide, broadly rounded near apex; in lateral view median lobe becoming slightly narrower near apex; median lobe without subapical tooth. Endophallus in ventral view rounded apically, in lateral view with multiple apexes.

Distribution

Known only from the type locality in Pará, Brazil ( Figure 6 ).

Habitat

Collected in lowland tropical rainforest with a trap; presumably requires an ant host like the other members of the genus.

Etymology

The specific epithet is in honour of Alfred Newton Jr., who originally indicated that this specimen is a new species.

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).

Figure 6. Distribution map of Paraxenopygus Bernhauer; P. tremolerasi (black circles), P. maurocyanos sp. n. (white star), P. peruvianus (black squares), P. newtoni sp. n. (white circle) and P. opacipennis (white squares).