Polylobus,

Silva, Sidnei Bortoluzzi Da & Caron, Edilson, 2014, The unique Brazilian species of Polylobus Solier (Coleoptera: Staphylinidae: Aleocharinae) with a checklist of all species of the genus, Zootaxa 3811 (2), pp. 226-238: 227-228

publication ID

http://dx.doi.org/10.11646/zootaxa.3811.2.4

publication LSID

lsid:zoobank.org:pub:B6C2894B-5C0E-4AB1-81D1-CCDD3C0A2190

persistent identifier

http://treatment.plazi.org/id/853087E0-FFCF-FF85-8BB4-63C3FB18FCA1

treatment provided by

Plazi

scientific name

Polylobus
status

 

Polylobus  stigma ( Erichson, 1839)

( Figs 1–7View FIGURES 1 – 4View FIGURES 5 – 7)

Homalota  stigma Erichson, 1839: 120 (original description, type locality: “ Brasilia ”). Atheta  ( Microdota  ) stigma: Bernhauer & Scheerpeltz, 1926: 635 (distribution). Tricolpochila  stigma: Pace, 1987 b: 170 (characters, lectotype designated).

Polylobus  stigma: Pace, 2000: 400 (mention); 496, 498 (characters).

Type material. Homalota  stigma Erichson, 1839. Syntype deposited in ZMHB, female, dissected, body glued on white board; maxila, labium and spermatheca mounted on the first plastic slide [presumably dissected by Pace in 1983], and right protarsus, tergite 8 and segments 9–10 [dissected by the current authors], both imbedded in Canada Balsam; labels: (1) ‘ 5417 ’ [old white label, printed in black]; (2) ‘ stigma ’ [old white label, handwritten]; (3) ‘Typus’ [red label, printed in black]; (4) ‘ stigmusa / stigma (Er.)/det. R. Pace 1983 ’ [white label, 1 st and 2 nd lines handwritten and the 3 rd line printed in black, with the decade of the year handwritten]; (5) ‘ stigma /Er/ Brasil. Gm.’ [green label, handwritten]; (6) ‘Zool. Mus. Berlin’ [yellow label, printed in black]; (7) ‘ SYNTYPUS / Homalota  / stigma Erichson, 1839 / labeled by MNHUB 2013 ’ [red label, printed in black]. Note 1: In the original description Erichson (1839) did not specify how many specimens he studied. We received from ZMHB only one specimen labelled as type, here named syntype. Note 2: Pace (1987 b) published the lectotype designation of Tricolpochila  stigma, however the designation label in the type material is missing. Note 3: we received the type material with labels organized in that sequence.

Redescription. Female. Maximum body length: 3.0 mm; maximum elytra width: 0.9 mm. Body broad; sides subparallel; uniformly light-brown with darker spot on tergite 6; dorsal surface glossy; setigerous pores sparse and more densely on head, pronotum and elytra; pronotum with pubescence directed latero-posteriad; elytra and abdomen with pubescence straight and direct posteriad.

Head as long as wide; eyes about as long as temples; infraorbital carina complete. Antennal article 2 nd slightly shorter than 1 st and longer than 3 rd; article 4 th subquadrate, articles 5–10 transverse and gradually increasing in width toward antennal apex; article 10 th twice as wide as long; article 11 th as long as articles 8–10 combined. Mandibles broad and curved at apex. Maxila with galea extending slightly beyond apex of lacinia ( Fig. 1View FIGURES 1 – 4), galea narrower than lacinia; apical lobe of galea covered with fine and short setae; internal margin of galea with long subapical setae; apical 1 / 3 of lacinia with a row of spines, middle portion covered with numerous setae; maxillary palpus with 4 articles, 2 nd slightly shorter than 3 rd, and 4 th about half length of thepreceeding one. Labium with ligula split into two lobes ( Fig. 2View FIGURES 1 – 4); labial palpus with 3 articles, 1 st the longest and 2 nd the shortest.

Pronotum transverse, 1.5 times as wide as long, broadest at basal half, anterior margin straight, lateral and posterior margin convex; hypomera invisible in lateral view. Prosternum transverse. Elytra slightly broader than pronotum; 1.2 times as long as pronotum; posterior outer corners deeply emarginated. Hind wings fully developed. Mesoventrite process about half length of mesocoxae, acute and sharp at apex, mesocoxae contiguous, mesocoxal cavities weakly or not margined posteriorly; isthmus almost the same length as mesoventrite process; metaventrite process almost not existent. Tarsal formula 5 - 5 - 5; tarsomere 5 the longest ( Fig. 3View FIGURES 1 – 4), as long as 3 rd and 4 th combined.

Abdomen gradually narrowing apically, first four visible terga deeply impressed basally; segment 7 the longest. Tergite 8 sparsely pubescence in posterior half, bearing three prominent setae at each side ( Fig. 5View FIGURES 5 – 7); posterior margin truncate. Sternite 8 sparsely pubescence in posterior half, bearing one prominent setae at each side ( Fig. 6View FIGURES 5 – 7); posterior margin broadly rounded. Tergite 10 slightly emarginated at apex and fused with tergite 9 medially ( Fig. 7View FIGURES 5 – 7). Spermatheca L-shaped ( Fig. 4View FIGURES 1 – 4); subspherical capsule, with slightly invaginated apex.

Male. Unknown.

Distribution. Brazil. In the original description ( Erichson 1839), and on the label of the type material there is not precise information about the locality, only that the material was donated by Germar ( Erichson 1839), presumably Ernst Friedrich Germar.

Bionomics. Unknown.

Taxonomic note. Pace (1987 b: 170) compared Polylobus  stigma with Tricolpochila topaliana ( Scheerpeltz, 1972)  , and in Pace (2000: 496, 498) compared P. s t i gm a with P. valparaisensis Pace, 2000  and P. granulifer Pace, 2000  , respectively. According to Pace, the characters easily separate P. s t i g m a from them are: length of eyes, punctures on elytra and general form of spermatheca. Unfortunately, in this work it was not possible to compare P. stigma with those species.

Following Klimaszewski & Sturm (1991) the genus have galea with sponge-like apical bristles, not seen in P. stigma. The galea of P. stigma has internal margin with long subapical setae, very similar to the species of Stethusa  ( Athetini  ) ( Gusarov 2002, Fig. 12). We also agree with Pace (2000: 400) that Polylobus  is forming a complex group, at least with Tricolpochila Bernhauer, 1908  and Polylobinus Bernhauer, 1908  . We tentatively include Polylobus  stigma in the genus Polylobus  pending further revision of the genus and related genera.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Loc

Polylobus

Silva, Sidnei Bortoluzzi Da & Caron, Edilson 2014
2014
Loc

Polylobus

Pace 2000: 400
2000
Loc

Homalota

Pace 1987: 170
Bernhauer 1926: 635
Erichson 1839: 120
1839