Dysanellus bruchi Bernhauer, 1911

Chatzimanolis, Stylianos, 2018, A Review of the Genera Dysanellus Bernhauer and Torobus Herman (Coleoptera: Staphylinidae: Staphylininae: Staphylinini), The Coleopterists Bulletin 72 (2), pp. 279-291: 282-285

publication ID

http://doi.org/ 10.1649/0010-065X-72.2.279

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:38A07005-9DF6-4468-BBC3-BD16FE6851B4

persistent identifier

http://treatment.plazi.org/id/296D87B5-FFEB-2405-FD2A-FB0BFE30FC90

treatment provided by

Diego

scientific name

Dysanellus bruchi Bernhauer, 1911
status

 

Dysanellus bruchi Bernhauer, 1911   ( Figs. 1 View Figs , 5 View Figs , 11 View Figs , 25)

Dysanellus bruchi Bernhauer 1911: 419   .

Type Material. Holotype, female, with labels: “Rep. Argentina, Prov. Buenos Aires, 11[xi].1896, C. Bruch ” / “ Trigonophorus bruchi   n. sp. Fvl.” / “ Dysanellus bruchi Brh   Typus” / “Chicago NHMus. M. Bernhauer Collection ”. In the collection of FMNH. A habitus photograph of the type appears in Chatzimanolis (2012).  

Additional Material. ARGENTINA: Entre Rios: Pronunciamiento , ii.1975, Bolle (1 female CNC)   ; Tucumán: 15 km N Tucumán, R´ıo Sali , 254m, 30.xii.1971, L. Herman (1 female, AMNH)   ; Unknown province : O. W. Thomas, 1901-143 (1 female, BMNH)   .

Diagnosis. Dysanellus bruchi   can be easily distinguished from D. transverserugosus   by the

absence of rugose sculpture ( Fig. 6 View Figs ) on the head and pronotum of D. bruchi   .

Description. Body length 13.6–16.1 mm. Head, pronotum, and elytra metallic green-blue. Mouthparts, mesoscutellum, ventral surface of body, and legs brown; antennomeres 1–5 brown, 6–11 dark orange. Posterior margin of abdominal segment VII and segment VIII orange-brown. Head transverse, width:length ratio = 1.44; with posterolateral corners slightly expanded. Epicranium with dense polygonal microsculpture and micropunctures; with medium-sized punctures around margin of head and eyes and with few other scattered medium-sized punctures on middle of epicranium. Eyes mediumsized, length of eyes / length of head ratio = 0.53, distance between eyes as wide as 1.94 times length of eye. Mandibles without long medial tooth. Distal margin of labial palpomere 3 straight, not bend. Antennomeres 1–7, 11 longer than wide; antennomere 8–10 subquadrate. Neck with microsculpture and few micropunctures. Pronotum quadrate, width:length ratio = 1.02; surface of pronotum uniformly covered with dense polygonal microsculpture and micropunctures; appearing matte due to microsculpture. Pronotum with one well-defined row of medium-sized punctures adjacent to each side of impunctate center line; with additional 3 diagonal rows of punctures (on each side), rows starting on anterolateral corners; distance between punctures varies, typically 2–3 times width of puncture. Elytra with small to mediumsized uniform punctures (about 14–16 punctures / elytral width); distance between punctures equal to width of puncture. Elytra shiny; with sparse microsculpture. Abdominal terga III–IV with faint subbasal (arch-like) carina. Female without obvious sexual structures. Males unknown.

Distribution. Known from the provinces of Buenos Aires, Entre Rios, and Tucumán in Argentina.

Dysanellus transverserugosus Bernhauer, 1921   ( Figs. 2 View Figs , 6 View Figs , 9 View Figs , 12–13 View Figs View Figs , 16–18 View Figs , 25)

Dysanellus transverserugosus Bernhauer 1921: 175   .

Type Material. Holotype, female, with labels: “[ Brazil] Ypiranga, Lüderw. leg, xi.[19]12” / “ Dysanellus transverserugosus   Typus” / “Chicago NHMus. M. Bernhauer Collection ”. In the collection of FMNH.  

Additional Material. BRAZIL: Minas Gerais: Fonseca, 1919 (1 male FMNH)   ; Rio de Janeiro: Petropolis. H. Schultz (1 female, FMNH)   ; S~ao Paulo: Campos de Jord ~ao, K. Lenko, vii.1957 (1 female, AMNH)   ; Ipiranga , iv.1919 (1 female,  

FMNH); same locality, ix.1920 (1 male, FMNH)   ; Santo Amaro , xii.1962, J. Lane (1 male, CNC)   ; S~ao Paulo , 14.i.1915, A. Bierig (2 males, 1 female, FMNH)   ; same locality ii.1923 (1 female, CNC)   . PARAGUAY: Itapúa: San Pedro Mi, San Rafael Reserve , -26.5233 -55.8050, FIT, 27–30.xi.2000, Z. H. Falin (1 male, SEMC) GoogleMaps   .

Diagnosis. Dysanellus transverserugosus   can be easily distinguished from D. bruchi   based on the rugose sculpture ( Fig. 6 View Figs ) on the head and pronotum on D. transverserugosus   . Ocyolinus rugatus Sharp   (illustrated in Chatzimanolis and Ashe 2009) appears superficially similar to D. transverserugosus   due to the rugose sculpture of the forebody, but these two species can be easily distinguished from each other by the shape of the last labial palpomere, the presence or absence of the postcoxal process, and the completely different shape of the aedeagus.

Description. Body length 14.1–17.6 mm. Head and pronotum dark metallic brown with purple overtones, elytra metallic golden brown. Mouthparts, mesoscutellum, ventral surface of body, and legs brown; antennomeres 1–6 brown, 7–11 dark orange. Abdominal segment VIII orange-brown. Head transverse, width:length ratio = 1.39; posterolateral corners slightly expanded. Epicranium with transverse rugose sculpture and dense, small punctures; distance between punctures equal to width of puncture; with polygonal microsculpture visible in areas not covered by punctures. Eyes small to medium-sized, length of eyes / length of head ratio = 0.36, distance between eyes as wide as 2.69 times length of eye. Mandibles with long medial tooth. Distal margin of labial palpomere 3 bent, not straight. Antennomeres 1–9, 11 longer than wide; antennomere 10 subquadrate. Neck with microsculpture and dense micropunctures. Pronotum quadrate, width:length ratio = 1.00; surface of pronotum with stark transverse rugose sculpture; with uniform, dense, small punctures in multiple rows, but rows hard to see due to rugose sculpture; with sparse microsculpture; pronotum shiny. Elytra with small to medium-sized, punctures (about 12–14 punctures / elytral width); distance between punctures equal to width of puncture. Elytra shiny; with sparse microsculpture. Abdominal terga III–IV without subbasal (arch-like) carina. Male secondary sexual structures ( Fig. 13 View Figs ) on sternum VII with broad, shallow emargination medially; presence of porose structure on sternum VII unclear; sternum VIII with U-shaped emargination medially; sternum IX with deep V-shaped emargination medially. Female without obvious sexual structures. Aedeagus as in Figs. 16–18 View Figs ; in dorsal view, paramere wide, converging to emarginate tip; paramere shorter and narrower (apically) than median lobe; in lateral view, paramere slightly concave, narrower apically; paramere with peg setae along lateral margins near apex. Median lobe in dorsal view wide, converging to rounded apex, with a large tooth apically; in lateral view, becoming much narrower near apex.

Distribution. Known from the states of Minas Gerais, Rio de Janeiro, and S~ao Paulo in Brazil and the department of Itapúa in Paraguay.

Remarks. It is unclear if there is a porose structure on sternum VII in males. While there is a general area in the middle of the anterior margin that is lighter in color and not covered by setae, there is no visible pore or specialized setae as in Torobus   ( Figs. 14–15 View Figs ) or in other Xanthopygina   (e.g., Chatzimanolis 2013, 2015a, b).

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

AMNH

American Museum of Natural History

FMNH

Field Museum of Natural History

SEMC

University of Kansas - Biodiversity Institute

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Dysanellus

Loc

Dysanellus bruchi Bernhauer, 1911

Chatzimanolis, Stylianos 2018
2018
Loc

Dysanellus transverserugosus

Bernhauer, M. 1921: 175
1921
Loc

Dysanellus bruchi

Bernhauer, M. 1911: 419
1911