Baconia brunnea, Caterino, Michael S. & Tishechkin, Alexey K., 2013

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297 : 46-47

Baconia brunnea sp. n. Figs 9G10 E–H, K–LMap 2

Type locality.

FRENCH GUIANA: Montagne des Chevaux [4.72°N, 52.40°W].

Type material.

Holotype male: GUYANE FR., Montagne des Chevaux, 4°43'N, 52°24'W Piège d’interception 16 May 2009. SEAG leg." / "Caterino/Tishechkin Exosternini Voucher EXO-00441" (MNHN). Paratypes (8): 1: FRENCH GUIANA: Montagne des Chevaux, 4°43'N, 52°24'W, Piège d’interception, 26.xii.2008 (CHND), 1: 4.i.2009 (MSCC), 1: 23.ii.2009 (AKTC), 1: 25.iv.2009 (FMNH); 1: Rés. des Nouragues, Régina, 4°2.27'N, 52°40.35'W, 28.i.2010, FIT, SEAG (CHND); 1: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 20.xii.2010, SEAG (CHND), 1: 21.iv.2011, SEAG (FMNH); 1:Route Nac. 1., P.k. 2, 4°53.5'N, 52°21'W, 20.ix.2008, FIT, J. Touroult (MNHN).

Other material.

BOLIVIA, 1: Santa Cruz:Amboro National Park, Los Volcanes, 18°06'S, 63°36'W, 1000 m, 20. xi– 12.xii.2004, FIT, H. Mendel & M. Barclay (BMNH). BRAZIL: 1: Mato Grosso do Sul: cerradão fragment nr. Selviria, 20°20'10"S, 51°24'36"W, 1.5 m, 11.xii.2010, FIT, C. Flechtmann, 1: 1.5 m, 21.xii.2010, FIT, C. Flechtmann, 1: 28.i.2011, FIT, ground level trail, C. Flechtmann, 1: 30.x.2010, FIT, ground level trail, C. Flechtmann (MEFEIS, FMNH). ECUADOR:1: Orellana: Est. Biodiv. Tiputini, 0.6376°N, 76.1499°W, 2-9.vi.2011, under bark, M. Caterino & A. Tishechkin, DNA Extract MSC-2128, EXO-00630 (MSCC). PANAMA:1: Colón: 14 km N jct. Escobal & Pina Rds., 2-11.vi.1996, FIT, J. Ashe & R. Brooks (SEMC); 1: Panamá: Barro Colorado Island, 9°11'N, 79°51'W, 23-27.vii.2000, FIT, S. Chatzimanolis (SEMC).

Diagnostic description.

Length: 1.9-2.3mm, width: 1.-1.9mm; body broadly subquadrate, strongly depressed, glabrous; color rufo-brunneus to rufo-piceous; frons broad, weakly depressed along midline, interocular margins convergent dorsad, ground punctation fine, with few coarser punctures at middle and toward vertex, frontal and supraorbital striae absent; antennal scape short, apex obliquely truncate, club asymmetrically oblong; epistoma truncate apically; labrum about 3 ×wider than long, apex weakly bisinuate; both mandibles with acute basal tooth; pronotum weakly convergent in basal two-thirds, rounded to apex, lateral marginal stria complete around lateral and anterior margins, submarginal stria absent, pronotal disk with only fine ground punctation over median three-fourths of disk, with small secondary punctures interspersed only at sides; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria finely impressed at base, rarely also at middle, dorsal striae 1-2 more or less complete, 2nd may be slightly abbreviated basally, 3rd stria very fine, scratchlike, present in basal half only, 4th, 5th and sutural striae absent, elytral disk with scattered secondary punctures in apical one-third; prosternal keel moderately broad, weakly convex, weakly emarginate at base, carinal striae complete, separate, subparallel; prosternal lobe about two-thirds keel length, apical margin rounded, with marginal stria present at middle; mesoventrite weakly produced at middle, marginal stria interrupted for width of prosternal keel; mesometaventral stria strongly arched forward, slightly detached at sides from lateral metaventral stria, which extends sinuately and obliquely toward outer third of metacoxa, metaventral and 1st abdominal disks impunctate at middle; abdominal ventrite 1 with complete inner lateral stria, and posterior fragment of outer; protibia 4-dentate, outer margin serrulate between marginal spines; mesofemur with transverse apical series of punctures, subcontinuous with posterior marginal stria; mesotibia with single marginal spine, a subcarinate series of setigerous punctures extending from tibial base to base of marginal spine; outer metatibial margin smooth; propygidium lacking basal stria, coarse secondary punctures rather dense along base and sides, sparser at middle, propygidial gland openings evident, located about midway behind anterior margin, about one-fourth width from each lateral margin; pygidium with sparse ground punctation and small secondary punctures evenly but sparsely interspersed. Male genitalia (Figs 10E-H, K-L): T8 broad, sides rounded to apex, basal rim slightly widened, basal emargination shallow, subangulate, apical emargination deep, narrow, ventrolateral apodemes weakly sclerotized, basal, opposing, separated by about one-half tegmen width; S8 elongate, divided, approximate at base, inner margins strongly and evenly divergent toward apex, outer margins divergent, apical guides widest near middle, narrowing to rounded apices, without conspicuous setae; T9 with basal apodemes long, thin, about one-half total length, T9 apices very narrowly rounded, glabrous, ventrolateral apodemes very poorly developed; T10 entire; S9 weakly widened to rounded base, head abruptly widened, sides obliquely subquadrate, deeply divided apically, nearly full length of sclerite; tegmen narrowest near base, widening weakly to near apex, tegmen in lateral aspect rather thick throughout, weakly curved ventrad just at apex; median lobe simple, about one-third tegmen length; basal piece about one-fifth tegmen length, apical emarginations deep.

Remarks.

As a strongly depressed, non-metallic species lacking 4th, 5th and sutural elytral striae (Fig. 9G), this species could only be confused with Baconia patula . The latter is, however, even more strongly flattened, and the body widens toward the front, whereas in Baconia brunnea , the body is clearly widest at the humeri. Baconia brunnea also lacks a basal propygidial stria. Due to some variation in elytral striation we restrict the type series to those specimens from French Guiana.

Etymology.

The name of this species refers to its non-metallic coloration.