Baconia plebeia, 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: 159-162

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scientific name

Baconia plebeia

sp. n.

Baconia plebeia   sp. n. Figs 44 E–H45A–CMap 13

Type locality.

FRENCH GUIANA: Réserve Trésor [4.59°N, 52.25°W].

Type material.

Holotype male: "GUYANE FR., Rés. Trésor (route de Kaw Pk18), 4°36.63'N, 52°16.74'W, 225m Piege d’interception 12 Nov 2009 SEAG leg." / "Caterino/Tishechkin Exosternini Voucher EXO-02591" (MNHN). Paratypes (53): FRENCH GUIANA: 1: Rés. des Nouragues, Camp Inselberg, 4°05'N, 52°41'W, 22.ix.2010, FIT, SEAG, 4:25.i.2011, FIT, SEAG, 1:30.ix.2010, FIT, SEAG, 2:8.x.2010, FIT, SEAG, 5:9.xi.2010, FIT, SEAG, 1:16.ix.2010, FIT, SEAG; 2: Rés. des Nouragues, Régina, 4°2.27'N, 52°40.35'W, 28.i.2010, FIT, SEAG (CHND); 2:8.ix.2009, FIT, SEAG (CHND); 2:Res. Trinité, 4°40.11'N, 53°16.99'W, 8.x.2010, FIT, Foret de transition, SEAG; 2: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 10.xii.2010, FIT, SEAG, 1:14.iii.2011, FIT, SEAG, 3:17.i.2011, FIT, SEAG, 1:2.ix.2011, FIT, SEAG, 2:20.xii.2010, FIT, SEAG, 1:24.i.2011, FIT, SEAG, 5:31.xi.2010, FIT, SEAG, 1:4.i.2011, FIT, SEAG, 6:7.ii.2011, FIT, SEAG, 1:9.ix.2010, FIT, SEAG; 1:Mont tabulaire Itoupé, 3°1.38'N, 53°5.73'W, 570 m, 17.iii.2010, FIT, SEAG (CHND); 1:Montagne des Chevaux, 4°43'N, 52°24'W, 1.viii.2009, FIT, SEAG (CHND), 1:11.iv.2009, FIT, SEAG, 1:11.vii.2009, FIT, SEAG (CHND), 1:22.i.2011, FIT, SEAG, 1:22.v.2010, FIT, SEAG,, FIT, SEAG (CHND); 2:Savane Matiti, 4.08333°N, 52.6167°W, 30.xi.2011, FIT, SEAG (MNHN).

Other material.

(18) FRENCH GUIANA: 1: Montagne des Chevaux, 4°43'N, 52°24'W,, FIT, SEAG (CHND), 1:8.viii.2010, FIT, SEAG; 1: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 31.xi.2010, FIT, SEAG. GUYANA:1: Region 8:Iwokrama Field Stn., 4°40'19"N, 58°41'4"W, 21.v.2001, Acromyrmex hystrix   refuse pile, R. Brooks & Z. Falin (SEMC). 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); 1:3.7 km SSE Buena Vista, Flora y Fauna Hotel, 17°29.9'S, 63°33.2'W, 400-440 m, 4-9.xi.2003, FIT, R. Leschen (AKTC). BRAZIL: 1: Maranhão: Estreito, 6°34'S, 47°27'W, v.1993, FIT (CHND); 1: Mirador, Calcarinha, 6°22'S, 44°22'W, 1.v.1993, FIT(CHND); 1: Mato Grosso do Sul: Mpio. Cuiaba, Chapada, September (CMNH); 3: Pará: Monte Alegre, 3°09'S, 52°03'W, 17. vi– 3.vii.1992, FIT (CHND); 2: Tucuruí, 3°45'S, 49°40'W, vi.1985, FIT (CHND). ECUADOR:1: Orellana: P. N. Yasuní, Est. Cient. Yasuní, 0°40.5'S, 76°24'W, 7-13.vii.1999, C. Carlton & A. Tishechkin (LSAM); 1: Res. Ethnica Waorani, 1 km S Onkone Gare Camp, Trans. Ent., 0°39'10"S, 76°26'W, 220 m,, fogging, mostly bare green leaves, some with covering of lichenous or brophytic plants in terra firme forest, T. Erwin (USNM), 1: 4.x.1995, fogging, T. Erwin (USNM). PERU:1: Loreto: 1.5 km Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240 m, 17.vii.1993, palmfruit berlese, R. Leschen (SEMC); 1: Madre de Dios: Pantiacolla Lodge, Alto Madre de Dios R., 12°39.3'S, 71°13.9'W, 420 m, 14-19.xi.2007, FIT, D. Brzoska (SEMC).

Diagnostic description.

Length: 1.2-1.5mm, width: 1.0-1.3mm; body broadly elongate oval, subdepressed, glabrous; color rufescent to rufobrunneus, shining; head with frons slightly elevated over antennal bases, weakly depressed at middle, ground punctation fine, rather dense, with coarser punctures over most of frons, frontal stria present only at upper corner of eye, rarely with fragments further along inner eye margin, absent across front, supraorbital stria represented by few median fragments; antennal scape short, club slightly oblong; epistoma faintly emarginate; labrum about 4 ×wider than long, apical margin emarginate; mandibles short, each with small, acute basal tooth; pronotum with sides weakly convergent in basal two-thirds, rounded to apex, lateral marginal stria detached from median part of anterior marginal stria, which diverges from margin behind eye, lateral submarginal stria present in basal three-fourths, diverging slightly from margin toward front, pronotal disk weakly depressed in anterolateral corners, ground punctation fine, very sparse, middle of disk impunc tate with small secondary punctures in lateral thirds, extending slightly further mediad along basal margin; elytra with two epipleural striae, outer subhumeral stria absent, inner subhumeral stria absent or present only at extreme base, dorsal striae 1-2 similar in length, only slightly abbreviated apically, 3rd stria present in basal one-third, 4th stria slightly longer, curving mediad toward scutellum at base, 5th stria shorter than 4th, present only in basal half, sutural stria slightly longer than 5th, situated further posterad, elytral disk with small secondary punctures in most of apical one-half; prosternal keel weakly convex, slightly emarginate at base, with more or less complete carinal striae subparallel or converging slightly to front; prosternal lobe about two-thirds keel length, apical margin rounded, marginal stria obsolete at sides; mesoventrite weakly produced at middle, with marginal stria complete; mesometaventral stria broadly but weakly arched forward, continuous laterally with inner lateral metaventral stria, which extends obliquely posterad toward inner third of metacoxa, outer lateral metaventral stria very short, oblique; metaventral disk moderately sparsely punctate at sides, impunctate at middle or with few small punctures in front of metacoxa; abdominal ventrite 1 with two complete lateral striae, with small median discal punctures limited to anterior half, ventrites 2-5 with fine punctures at sides, those of ventrites 3 and 4 moderately dense across middle; protibiae weakly tridentate, with median and basal marginal denticles very small, margin serrulate; mesotibia with two marginal spines; outer metatibial margin with fine subbasal denticle; propygidium lacking basal stria, with fine ground punctation interspersed with ocellate secondary punctures separated by about half their diameters, propygidial gland openings inconspicuous; pygidium with fine ground punctation becoming denser toward apex, with secondary punctures principally in basal half. Male genitalia (Figs 44 E–H): T8 rather deeply, arcuately emarginate at base, ventrolateral apodemes with inner apices subparallel, separated by about three-fourths T8 width, projecting beneath to about ventral midpoint, obsolete apically, apical margin shallowly, narrowly emarginate; S8 with halves narrowly fused, more strongly sclerotized along midline and basal and apical margins, basal emargination very broad, sinuate, basal apodemes tapered, curving mediad, sides subparallel to apex, apices obliquely truncate, with inner corner slightly produced, with numerous apical setae, apical emargination broad, rounded; T9 with short, bluntly rounded basal apodemes, separated dorsally, ventrolateral apodemes narrowly but bluntly produced beneath, apices of T9 narrowly rounded to subtruncate, with single subapical seta on each side; T10 with weak apical emargination; S9 with long, narrow, medially keeled stem, head abruptly widened, sides weakly rounded to apex, basolateral margins slightly desclerotized, apices acute, widely separated, apical emargination broad, sinuate; tegmen with sides subparallel from base to about midpoint, narrowed to apex, apices subacute, tegmen moderately curved ventrad, with eversible subapical denticles near apex; median lobe about one-fourth tegmen length; basal piece about one-third tegmen length.


This species is very similar to several of the preceding, especially Baconia slipinskii   and Baconia mustax   , in possessing sparse punctures on the 1st abdominal ventrite, a 4th elytral stria which is arched mediad basally, dense punctures across the middles of the 3 rd and 4th abdominal ventrites, and a small cluster of metaventral punctures anteromediad the metacoxa. This species can be distinguished from all others by its weak middle and basal protibial teeth (Fig. 45B), its complete marginal mesoventral stria which is usually smooth contrasting with its crenulate mesometaventral stria, and its subequal 3rd and 4th elytral striae, with the 5th and sutural striae short and displaced progressively further posterad (Fig. 45A).

The species is somewhat variable over its considerable range, apparently covering most of Amazonia. We restrict the type series to those specimens from French Guiana to avoid the possibility of including cryptic species.


This species’ name, ‘plebeia’, refers to its being quite commonly collected relative to most Baconia   species.