Xenopygus pycnos Chatzimanolis

Chatzimanolis, Stylianos & Caron, Edilson, 2016, New species and synonymies in Xenopygus Bernhauer (Coleoptera: Staphylinidae: Staphylinini), Zootaxa 4200 (1), pp. 131-142 : 138-140

Xenopygus pycnos Chatzimanolis , new species

( Figs. 2 , 7–11)

Type material. Holotype, here designated, male with labels as follow: “ Colombia, Amazonas PNN, Amacayacu Cabaña Lorena , 3°00’S 69°59’W, 210m, Malaise 1, 27.viii–1.ix.2001, D. Campos Leg. M.2237” / “SM0548724” / “ Holotype Xenopygus pycnos Chatzimanolis , des. Chatzimanolis 2016”. Deposited in SEMC . Paratypes, two, both female, with labels: “ Bolivia: Santa Cruz Dept., 3.7km SSE Buena Vista Hotel Flora y Fauna , 17°29’S 63°33’W, 28.iv.–2.v.2004, A.R. Cline, FIT, BOL 1 Cline04 014.5” / “SM0779411” and “ Peru: Dept . Loreto, 1.5km N. Teniente Lopez, 2°35.66’S 76°06.92’W, 28.vii.1993, 210– 240m, Richard Leschen, #188, ex: flight intercept trap ” / “SM0080092”. Both paratypes with label “ Paratype Xenopygus pycnos Chatzimanolis , des. Chatzimanolis 2016” and deposited in SEMC. A.cvs file of specimen data in Darwin Core fields is available at https:// figshare.com/authors/ Stylianos _ Chatzimanolis /384794.

Diagnosis. This species can be easily distinguished from all other taxa in Xenopygus by the dense, confluent punctation ( Figs. 2 , 7) of head and thorax.

Description. Body length 8.9–9.1 mm. Coloration of head, neck and pronotum reddish-brown with metallic green overtones. Mouthparts and antennae (except antennomere 11 orange) reddish-brown. Ventral surface of head brown; ventral surface of thorax and legs reddish brown. Elytra bright orange; mesoscutellum brown. Abdomen brown with (in some specimens) paratergites and posterior margin of segments reddish-brown. Abdominal sternite VII brown except posterior 1/4 to 1/3 reddish-brown; sternite VIII dark orange.

Head transverse, width:length ratio = 1.30; eyes large, prominent, head:eye length ratio = 1.65; head with confluent, deep, small punctures except medially; punctures slightly more sparse on clypeus; epicranium with dense microsculpture. Antennae with microtrichiae starting on antennomere 4; antennomeres 1–4 longer than wide; antennomere 5 subquadrate; antennomeres 6–10 transverse, progressively becoming wider. Labial palpomere 3 truncate, slightly dilated. Pronotum longer than wide, pronotum width:length ratio = 0.92; pronotum with confluent deep, small punctures except midline without punctures. Pronotum subequal in length to elytra; elytra covered with confluent small punctures. Abdominal tergum V without an arch-like carina.

Secondary sexual structures. Males with shallow emargination on posterior margin of sternite VII; porose structure absent on sternite VII; sternite VIII with shallow narrow U-shaped emargination on posterior margin. Females with no apparent secondary sexual structures.

Aedeagus as in Figs. 8–10 ; in dorsal view paramere converging to rounded tip; paramere slightly longer and narrower than median lobe; in lateral view paramere concave apically; paramere with peg setae along the lateral margins from tip to middle. Median lobe in dorsal view wide, converging to pointed apex, with two small teeth apically; in lateral view becoming narrower near apex.

Etymology. The specific epithet is derived from the Greek word πυκνός (dense) and refers to punctation pattern of head and thorax.

Distribution. Known from the departments of Santa Cruz in Bolivia, Amazonas in Colombia, and Loreto in Peru. The species is rather rare in collections in contrast to other species of Xenopygus .

Figures

FIGURES 1 – 2. Habitus photographs of new species in Xenopygus. 1. Xenopygus davidi Chatzimanolis, total length = 10.3 mm. 2. Xenopygus pycnos Chatzimanolis, total length = 8.9 mm.

FIGURES 8 – 10. Aedeagus of X. pycnos Chatzimanolis. 8. Lateral view. 9. Dorsal view. 10. Detail of paramere, ventral view.