Xenopygus confusus Irmler

Caron, Edilson, De Castro, Jessica C., Da Silva, Maycon R. & Ribeiro-Costa, Cibele S., 2016, Phylogeny and revision of a colorful Neotropical genus of rove beetles: Xenopygus Bernhauer (Coleoptera: Staphylinidae), Zootaxa 4138 (1), pp. 59-82 : 73-74

Xenopygus confusus Irmler

( Figs 4 , 7, 32, 35, 41, 44, 47, 58)

Xenopygus confusus Irmler, 1982: 208 (type locality: ‘ Guyane, France Nouveau Chantier’); Herman, 2001b: 3611 (catalog); Rodriguez et al., 2012: 233 (characteristics, biological notes).

Type material. Holotype, male, deposited in FMNH and labeled as ‘ Guyane Franç se/ Nouveau Chantier/ Collection Le Moult’ [white label, printed], ‘MAI [white label, printed]’. ‘ bicolor Cast / det. Bernhauer’ [white label, printed], ‘Chicago NHMus/ M. Bernhauer/ Collection’ [white label, printed], ‘ Holotypus / Xenopygus / confusus / det. U. Irmler’ [red label, printed], bicolor /Cast. Esud. ens/p.115’ [white label, handwritten], ‘ Xenopygus confusus / Irmler, 1982 / J.L. Navarrete det. 2001’ [white label, printed], ‘Photographed/ Kelsey Keaton 2014/ Emu Catalog’ [blue label, printed], FMNHINS/ 2818940/ FIELD MUSEUM’ [white label, printed]. Three paratypes deposited in FMNH, two labeled as ‘ bicolor Lap. / Cayenne. Skalitzky/ det. Bernhauer’ [white label, handwritten], ‘Chicago NHMus/ M. Bernhauer/ Collection’ [white label, printed], ‘ Paratypus / Xenopygus / confusus / det. U. Irmler’ [red label, printed], Xenopygus confusus / Irmler, 1982 / J.L. Navarrete det. 2001’ [white label, printed]; and one labeled as ‘ Xanthopygus / bicolor Lap. / Cayenne 1869/ C. Jelski’ [white label, handwritten], ‘ bicolor Lap. / Cayenne.

Skalitzky/ det. Bernhauer’ [white label, handwritten], ‘Chicago NHMus/ M. Bernhauer/ Collection’ [white label, printed], ‘ Paratypus / Xenopygus / confusus / det. U. Irmler’ [red label, printed], Xenopygus confusus / Irmler, 1982 / J.L. Navarrete det. 2001’ [white label, printed].

Diagnosis. Xenopygus confusus is easily distinguished from X. analis and X. bicolor by the color of the head and pronotum, metallic blue to green, elytra yellow to dark brown, basal half of abdominal segment VII evidently darker than remainder of abdomen ( Fig. 4 ) and sternite VIII of male with apical margin strongly emarginate at middle (Fig. 35).

Redescription. BL: 11.0–18.0 mm, BW: 3.3 mm. Head and pronotum with metallic blue to green color, elytra and abdominal segments yellowish, basal half of abdominal segment VII evidently darker than remainder of abdomen ( Fig. 4 ). Pronotum with setal punctuations forming a pair of longitudinal lines in the median region and distributed in each lateral third, more evident in the anterior half (Fig. 7).

Eyes slightly longer than half of the head. Antennal scape slightly longer than antennomeres II and III combined; antennomere IV as long as wide; antennomeres V–XI with microsetae; antennomere XI apparently symmetric. Mesoventrite process with apex truncate and wide; and metatarsomeres II–IV slightly bilobate. Tergite III–V with arched carina; sternite VII of male with wide porous structure at middle (Fig. 32); sternite VIII of male strongly medially emarginate (Fig. 35). Median lobe with bulbous base ( Fig. 41 ); apex rounded and slightly truncate, subapically with tooth in hook shape in ventral surface (Fig. 44); parameres fused in a single plate and almost reach the apex of median lobe, apex tightly truncate, apical two thirds with peg setae forming two irregular lines near the lateral margins (Fig. 47).

Geographical record. Trinidad and Tobago: Saint George. French Guiana: Cayenne. Brazil: Pará ( Fig. 58 ).

Biological notes. Xenopygus confusus was collected on decomposing fruits.

Figures

FIGURES 2 – 4. Habitus. 2, Xenopyugs analis; 3, X. bicolor; 4, X. confusus. 5 – 7. Detail of head and pronotum. 5, X. analis; 6, X. bicolor; 7, X. confusus. Scale = 2 mm.

FIGURES 39 – 41. Aedeagus, lateral view. 39, X. analis; 40, X. bicolor; 41, X. confusus. 42 – 44. Apex of median lobe, ventral view. 42, X. analis; 43, X. bicolor; 44, X. confusus. 45 – 47. Apex of paramere, dorsal view. 45, X. analis; 46, X. bicolor; 47, X. confusus. Scale = 0.5 mm.

FIGURES 57 – 59. Geographical distribution of Xenopygus species. 57, X. analis; 58, X. bicolor (dots) + X. confusus (triangles); 59, X. cordovensis (dots) + X. sancticamillus, sp. nov. (triangles) + X. petilicolis, sp. nov. (squares).