Diochus peruvianus, Irmler, 2017

Irmler, Ulrich, 2017, A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae), Beiträge Zur Entomologie = Contributions to Entomology 67 (1), pp. 1-62 : 25

publication ID

https://doi.org/ 10.21248/contrib.entomol.67.1.001-062

publication LSID


persistent identifier


taxon LSID


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scientific name

Diochus peruvianus

spec. nov.

Diochus peruvianus   spec. nov.


Figs 23A–C View Figs 22–25 , 39I View Fig , 43H View Figs 43

Type material: male, Holotype: Peru: Madre de Dios, Amazonas Lodge , N Atalaya (71°22.6'W, 12°52.2'S), 480 m elevation, collected by flight intercept trap, 10.– 13.11.2007, leg. Brzoska #PER1B07 002 ( KNHM). GoogleMaps  

Paratypes: Brazil: Santa Catarina, Nova Teutonia , 1 male, 5 females, 12.1953, leg. F. Plaumann ( FMNH)   ; Santa Catarina, without more details, 1 male, 6 females, leg. P.E. Klimsch ( NMW)   ; Argentina: Salta Prov., 1–6 mi. W of Aguas Blancas, road to Parq. Nat. Baritu (22°44'S, 64°22'W), 490 m elevation, leaf litter near stream, 2 males, 3 females, 14.11.1995, leg. L. Herman ( AMNH) GoogleMaps   ; Salta Prov. 2 km NW Tobantirenda nr. Dique (22°07'S, 63°43'W), 575 m elevation, leaf litter nr. stream, 4 males, 4 females, 15.11.1995, leg. L. Herman (6 AMNH, 2 UIC) GoogleMaps   ; Jujuy Prov. 8 km NW Calilegua (23°45'S, 64°51'W), 635 m elevation, litter near stream, 12 males, 6 females, 12.11.1995, leg. L. Herman (16 AMNH, 2 UIC) GoogleMaps   .

Diagnosis: The species resembles a large D. brooksi   in colouration of the body and antennae, but is much longer than that species. The paramere is unique with the recurved apex. Without dissecting the aedeagus a differentiation from similarly large and coloured species of other species groups is difficult, e.g. D. hermani   , D. vicinus   .

Description: Length: 4.9 mm Colouration: black; legs brown; antennomeres one to three light yellowish brown; following antennomeres dark brown; last antennomere brown with light apex.

Head: 0.63 mm long, 0.56 mm wide; large eyes slightly prominent; temples 1.3 times longer than eyes; EL: HL = 0.29; temples nearly parallel; PW: EW = 1.06; posterior angles shortly rounded; setiferous punctation denser on clypeus than on vertex; pair of rows with four supraocular punctures posteriorly convergent; in anterior part, between rows with irregular dense punctation; ending posteriorly at third pair of punctures; temples with dense setiferous punctation; without microsculpture; surface shiny.

Antennae as long as head and half of pronotum combined; first antennomere more than twice as long as wide; second antennomere shorter; twice as long as wide; conical third antennomere 1.4 times as long as second; 2.3 times as long as wide; length of following antennomeres decreasing; fourth antennomere slightly longer than wide; tenth slightly wider than long; all antennomeres pubescent and with apical setae; basal antennomeres with thicker setae.

Pronotum: 0.90 mm long, 0.72 mm wide; sides approximately parallel; anterior angles widely rounded; anterior margin nearly semi-circular; posterior angles shortly rounded; lateral margin fine; in dorsal aspect, visible in posterior half; wide midline impunctate; along midline, three pairs of setiferous punctures; interstice between first pair of punctures twice as wide as between posterior two pairs; laterad several irregular setiferous punctures; along lateral margin with several setiferous punctures; without microsculpture; surface polished.

Elytra: 0.83 mm long, 0.89 mm wide; posteriad, sides slightly divergent; at posterior angles 1.2 times as wide as at shoulder; shoulders shortly rounded; setiferous punctation in irregular rows of five to seven punctures; interstice between sutural row and disc rows wider than between disc rows; with sparse non-setiferous punctures; several setiferous punctures along lateral margin; without ground sculpture; surface shiny.

Abdomen densely pubescent.

Aedeagus elongate; seminal vesical of endophallus thick; less than half as long as central lobe; basal inner duct ending in weakly sclerotised forceps; paramere shorter than central lobe; slender and curved in apical third; clapsing central lobe; ending in acute apex; at outer edge of apical third with three long setae; basal shaft with few sensillae.

Spermatheca 0.46 mm long, 0.36 mm wide; weakly oval; bursa copulatrix in lateral position to coiled duct; coiled duct with strongly irregular coils.

Etymology: The species name derived from the country,

where it was collected.


The Educational Science Museum [=Kuwait Natural History Museum?]


Field Museum of Natural History


Naturhistorisches Museum, Wien


American Museum of Natural History