Diochus hermani, 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 : 11-12

publication ID

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

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scientific name

Diochus hermani

spec. nov.

Diochus hermani spec. nov.


Figs 15A–C View Figs 14–17 , 38I View Fig , 42D View Figs 42

Type material: male Holotype: Argentina, Cordoba Prov. , W of Pampa de Achala (31°46'S, 64°55.14'W), 1320 m elev., 10.12.2000, leg. L. Herman, #3078 ( AMNH). GoogleMaps

Paratypes: Argentina, Tigre, female, leg. Breyer ( FMNH) ; Brazil: Estado Santa Catarina, Nova Teutona (52°23'W, 27°11'S), 300–500 m elev., 2 males, 11 females, 3.1954, leg. F. Plaumann ( FMNH, UIC) GoogleMaps .

Diagnosis: Among the species of the group, D. hermani closely resembles D. vicinus and D. plaumanni in size. D. hermani is darker than D. vicinus ; in particular, the pronotum is not lighter than the head. Moreover, the head is more slender. The head is 1.35 times as long as wide, whereas it is only 1.15 times as long as wide in D. vicinus and 1.27 times as long as wide in D. plaumanni . The species can be easily identified by the specific shape of the paramere. Besides a short triangular process at base of the shaft another transparent process is developed near the apex. The apex has a asymmetric narrow trinagular process. In D. hermani the parameres are longer than the central lobe, whereas they are slightly shorter in D. vicinus . More differences to D. plaumanni are listed there.

Description: Length: 4.3 mm. Colouration: dark brown, posterior half of elytra and legs yellow; antennomeres dark brown except antennomeres one to three yellow.

Head 0.65 mm long, 0.48 mm wide; eyes slightly prominent; temples twice as long as eyes; EL: HL = 0.22; slightly divergent posteriad; PW: EW = 1.16, posterior margin slightly convex; setiferous punctation moderately deep and dense; wide midline from clypeus to posterior vertex impunctate; adjacent to impunctate midline with row of six punctures; on supraocular and on postoculare area irregularly punctate; on posterior vertex transverse rows of setiferous punctures; without microsculpture; surface polished.

Antenna as long as head and half of pronotum combined; first antennomere thicker than following ones; second and third antennomeres conical; second antennomere shorter than first and third; nearly twice as long as apical width; third antennomere slender; nearly three times as long as apical width; following antennomeres distinctly shorter and decreasing in length; fourth antennomere slightly longer than wide; tenth antennomere slightly wider than long; all antennomeres pubescent and with few long apical setae.

Pronotum 0.76 mm long, 0.56 mm wide; sides parallel; anterior third widely rounded; posterior margin shortly convex; lateral margin fine; in dorsal aspect, only visible in posterior half; setiferous punctation moderately deep and sparse; midline impunctate; adjacent to midline three pairs of punctures; interstice between anterior pair of punctures twice as wide as between posterior pairs of punctures; laterad, transverse row of three punctures; along lateral margin several setiferous punctures; without microsculpture, but with sparse micro-punctation; surface polished.

Elytra 0.76 mm long, 0.74 mm wide; shoulders obtuse; slightly widened posteriad; at posterior angles 1.2 times as wide as at shoulders; posterior angles nearly rectangular; posterior margin triangularly emarginate; setiferous punctation in irregular rows; inner row directly adjacent to suture line; laterad two rows on disc with four to five setiferous punctures; along lateral margin several setiferous punctures; surface with weak coriaceous ground sculpture, less shiny than head and pronotum.

Abdomen densely pubescent.

Aedeagusmoderatelybroad; seminalvesicalofendophallus thick; 0.6 times as long as total length of central lobe; basal inner duct looped; ending in thick widened funnel; apex of funnel with forceps; apical filamentous duct forming one large coil; paramere projecting central lobe; near base with triangular prominence; in anterior part slightly curved; in anterior third with obtuse short lobe; apex angled ending in transverse elongate process; at apical edge with four long setae; between triangular and obtuse process several sensillae.

Etymology: The species name honours the collector of the species, Dr. Lee Herman, who collected intensively in the Neotropics.


American Museum of Natural History


Field Museum of Natural History