Diochus vicinus SHARP, 1876

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: 19-20

publication ID

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

publication LSID

lsid:zoobank.org:pub:6526DDDB-7F27-41AC-8575-AF3C28A4177C

persistent identifier

http://treatment.plazi.org/id/3A060C62-4931-6C0F-FCF7-745DFE31F7DD

treatment provided by

Felipe

scientific name

Diochus vicinus SHARP, 1876
status

 

Diochus vicinus SHARP, 1876  

Figs 10A–C View Figs 10–13 , 39D View Fig , 43C View Figs 43

Diochus vicinus SHARP, 1876: 185  

Diochus flavicans SHARP, 1876: 185   new synonymy

Type material examined: 1 female, Brazil: Pará , Tapajos ( BMNH)   ; 2 female syntypes of D. flavicans   , Brazil: Pará , Tapajos ( BMNH)   .

Further material examined: Colombia: Vichada, PNN El Tuparro, Cerro Tomás (67°51'W, 5°21'N), 140 m elev., Malaise trap, male, 22.5.– 3.6.2001, leg. I. Gill ( KNHM) GoogleMaps   ; Brazil: Amazonas, Ilha de Marchanteria (59°58'W, 3°15'S), Varzéa , floating meadow, 3 males, 16.2.1982, 22.1.1982, leg. J. Adis ( UIC) GoogleMaps   ; Ilha Muratú (60°21'W, 3°34'S), 2 females, 25.2.1975, leg. U. Irmler ( UIC) GoogleMaps   ; Roraima, mouth of Rio Branco, Lago Adauaú (61°51'W, 1°19'S), male, 22.8.1971, leg. U. Irmler ( UIC) GoogleMaps   ; Pará , 5 km E Belém, soil litter layer, in primary terra firme forest, male, 30.5.1973, leg. R.T. Schuh ( AMNH)   ; IPEAN, from litter in “ Mocambo ”, male, 3.7.1973, leg. R.T. Schuh ( AMNH)   ; Mato Grosso, Barra de Tapirapé , at light, 4 males, 1 female, 15.12.1960, leg. B. Malkin ( FMNH)   ; male, same location, same collector, but 1.– 11.1.1963 ( FMNH)   ; Peru: Loreto, Lake Yarinachocha , 10 km NW Pucallpa, 150 m elev., collected at light, male, 27.12.1971, leg. R.T. Schuh ( AMNH)   ; Madre de Dios, Tambopata , male, 26.10.1982, leg. L.E. Watrous, G. Mazurek ( FMNH)   .

Diagnosis: In size, colouration and length of antennae, D. vicinus   resembles D. inornatus   and D. hanagarthi   . The EL: HL is 0.24, slightly shorter than in D. hanagarthi   , separates both species from D. inornatus   with longer temples (EL: HL = 0.21). Moreover, the antennae are slightly longer than in D. hanagarthi   and D. inornatus   . The species can be easily separated from the other Diochus species   by the elongate hooked apical process of the paramere. Unfortunately, the two syntypes of D. flavicans   are females. As I found no significant differences to

D. vicinus   , D. flavicans   is synonymised to D. vicinus   .

Description: Length: 4.3 mm. Colouration: head and pronotum totally yellow-brown; elytra light brown with dark transverse spot in anterior half on each side of suture; abdomen darker than fore-body, but posterior margin of segments as light elytra; legs yellow; antennomeres 1, 2, and 11 yellow; antennomeres 4–10 darker, brown.

Head: 0.46 mm long, 0.40 mm wide; eyes slightly prominent; moderately large; temples 2.5 times as long as eyes; EL: HL = 0.24; temples slightly divergent posteriad; PW: EW 1.14; posterior angles nearly rectangular; sharply rounded; clypeus widely rounded; neck one third as wide as head; inter-ocular space and clypeus densely and deeply punctate; wide midline impunctate; on average, interstice between punctures as wide as or slightly shorter than diameter of setiferous punctures; on average, setae distinctly longer than interstices; on vertex sparsely punctate; large area without punctures; laterad densely punctate; surface without microsculpture; shiny.

Antennae slightly longer than head and half of pronotum combined; first to third antennomere distinctly longer than following antennomeres; nearly twice as long as wide; fourth to eleventh antennomeres approximately quadrate; first antennomere with long thick setae; fourth to eleventh antennomere pubescent;.

Pronotum: 0.54 mm long, 0.49 mm wide; widest close to posterior margin; slightly narrowed to anterior margin, but nearly parallel; posterior and anterior angles widely rounded; sides finely margined; in dorsal aspect, margin covered in anterior half; setiferous punctures large, but sparse; on average, interstices between punctures twice as wide as diameter of punctures; on each side of impunctate midline with 3–4 setiferous punctures in longitudinal line; without microsculpture, but indistinct extremely weak ground sculpture; surface shiny.

Elytra: 0.67 mm long, 0.67 mm wide; sides divergent to posterior margin; posterior angles and shoulders widely rounded; shoulders obtuse; setiferous punctures in longitudinal lines; setae pointing posteriad; interstices between punctures of lines and between lines at least two to three times as wide as diameter of punctures; surface with indistinct weak ground sculpture; shiny.

Abdomen densely pubescent and matt in contrast to fore-body.

Aedeagus with seminal vesical slightly longer than half of total length of central lobe; basal inner duct looped; apical inner duct with large coil; paramere narrow at base; slightly widened to apex; not projecting apex of central lobe; with long asymmetric acute process at apex with short apical hook.

Spermatheca 0.47 mm long, 0.21 mm wide; bursa copulatrix in central position of coiled oval duct; coiled duct widest in anterior half; narrowed at middle and slightly widened in posterior half.

KNHM

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

AMNH

American Museum of Natural History

FMNH

Field Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Diochus

Loc

Diochus vicinus SHARP, 1876

Irmler, Ulrich 2017
2017
Loc

Diochus vicinus

SHARP, D. 1876: 185
1876
Loc

Diochus flavicans

SHARP, D. 1876: 185
1876