Baconia salobrus (Marseul, 1887)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297 : 91-94

Baconia salobrus (Marseul, 1887) Figs 2425Map 7

Phelister salobrus Marseul, 1887: cxlviii; Baconia salobrus : Dégallier et al. 2012: 36.

Type locality.

BRAZIL: Bahia: Salobro [exact locality uncertain].

Type material.

Lectotype, sex undetermined, here designated (BMNH): "Salobro prov de Bahia, Bresil, E.Gounelle 6.7.1885" / “Marseul’s Type" / "Phelister salobrus n.sp." / "G.Lewis Coll. B.M.1926-369" / "Cotype or Type of Phel salobrus Mars. RLW ‘54” / "LECTOTYPE Phelister salobrus Marseul, 1887, M.S.Caterino & A.K.Tishechkin des. 2010". Paralectotypes (4): same data as type(BMNH, MNHN). This species was described from an unspecified number of specimens, and the lectotype designation fixes primary type status on one of the known original specimens.

Other material.

ARGENTINA: 1: Jujuy: P. N. Calilegua, Estaca El Cero, 900 m, 18-28.xii.1987, forest malaise-FIT, S. & J. Peck (CHSM). BELIZE, 1: Cayo: Las Cuevas Res. Sta., 16°44.00'N, 88°58.24'W, 550 m, 23.v.2000, FIT, M. Caterino; 1: v.1997, D. Inward; 1: Orange Walk: Rio Bravo Cons. Area, La Milpa Field Station, 15-25.v.1997, FIT, C.E. Carlton (CHPWK). BOLIVIA 1: Santa Cruz:Hotel Flora y Fauna, 4-5 km SSE Buena Vista, 17°29.9'S, 63°39.1'W, 440 m, 24-31.xii.2003, FIT, S. & J. Peck (AKTC); 1:3-9.xi.2002, FIT, R. Leschen (AKTC). BRAZIL: 3: Bahia: 1885, E. Gounelle (MNHN); 1: Mato Grosso do Sul: cerradão fragment nr. Selviria, 20.3354°S, 51.4095°W, 30. xi– 3.xii.2011, FIT, M. Caterino & A. Tishechkin, DNA Extract MSC-2241, EXO-00856 (MSCC). FRENCH GUIANA: 1: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 31.xi.2010, FIT, SEAG. PANAMA:1: Colón: P. N. San Lorenzo, Achiote, Cafetal A Dist., 09°12'N, 79°58'W, 0 m, 7-21.v.2007, FIT, A. Mercado (GBFM).

Diagnostic description.

Length: 2.2-2.4mm, width: 1.9-2.2mm; body elongate oval, weakly depressed, glabrous; color piceous, shining; frons depressed along midline, with few coarse punctures in depression, interocular margins convergent dorsad, frontal stria interrupted above antennal bases and at middle; supraorbital stria absent; antennal scape short, club slightly oblong; epistoma straight across apex; labrum about 3 ×wider than long, broadly, shallowly emarginate; mandibles each with small basal tooth; pronotal sides rather evenly narrowed in basal two-thirds, thence abruptly narrowed to apices, lateral marginal striae continuous around sides and front, submarginal stria absent, pronotal disk weakly depressed in anterior corners, disk largely impunctate at middle, with sparse coarse punctures near sides; elytra with two complete and a third partial epipleural stria, outer subhumeral stria absent, inner subhumeral stria fragmentarily present at base, dorsal striae 1-3 more or less complete, 4th stria present in basal third, arched mediad at base toward suture, rarely meeting sutural stria, 5th stria absent, sutural stria present in apical half to two-thirds, rarely complete, elytral disk sparsely punctate in apical fourth; prosternal keel moderately broad, weakly convex, very shallowly emarginate at base, with more or less complete, subparallel cari nal striae; prosternal lobe about two-thirds keel length, apical margin rather narrowly rounded, marginal stria present only at middle; mesoventrite weakly produced at middle, marginal stria narrowly interrupted at middle, rarely complete; mesometaventral stria arched forward, continued laterally by inner lateral metaventral stria, which is rather widely separated at base from mesocoxa, curving posterolaterad toward middle of metacoxa, outer lateral metaventral stria parallel to basal half or slightly more of inner metaventral stria; metaventral and abdominal disks impunctate at middle; abdominal ventrite 1 with complete inner lateral striae, outer lateral stria present as short fragment behind metacoxa; protibiae 4-dentate, with basal two spines close together, outer margin finely serrulate; mesotibia with one marginal spine; outer metatibial margin smooth; propygidium lacking basal stria, with small secondary punctures separated by about 1.5 × their diameters near base, smaller and sparser toward apex; propygidial glands evident about one-fourth from anterior and lateral margins; pygidium with fine ground punctation uniformly interspersed with small secondary punctures, separated by 2 × their diameters. Male genitalia (Fig. 25): T8 about one-third longer than broad, sides subparallel, basal emargination deep, narrow, basal rim well sclerotized, basal membrane attachment line conspicuous, apical emargination moderately deep, ventrolateral apodemes separated by about two-thirds maximum T8 width, extending about one-third distad beneath, narrowed to apex; S8 divided, inner margins approximate along much of midline, divergent at base and apex, apical margin with membraneous velum, without conspicuous setae, outer margins subparallel to weakly convergent, apical guides narrow, consistent in width throughout, narrowly rounded apically; T9 with basal apodemes rather thick, short, with dorsal surface extending nearly to base, T9 apices broad, finely acute at inner corner, glabrous, ventrolateral apodemes prominent but blunt beneath; S9 with sides of stem subparallel in basal half, evenly widening to apex, with deep, narrow apical emargination, very narrowly desclerotized along most of midline; tegmen widest near base, sides very weakly rounded, convergent to narrow apices, tegmen in lateral aspect more or less straight, just slightly bent ventrad at apex; median lobe simple, two-thirds tegmen length; basal piece long, nearly two-thirds tegmen length.

Remarks.

In this widespread species, the 4th elytral stria is represented by a basal arch that does not meet the sutural stria (Fig. 24A), the marginal mesoventral and mesometaventral striae are both complete (Fig. 24B), the labrum is evenly emarginate (Fig. 24C), and the frontal stria is interrupted over both antennal bases and at the middle. These characteristics are adequate to distinguish it from other convex black Baconia spp. In addition, the elongate basal piece of the aedeagus is unique in the group (and nearly in the genus).

This is a difficult type locality to pinpoint, but there appears to have been a diamond mine associated with a perhaps now-extinct town of Salobro along the Pardo River, in southern Bahia, approximately 70km upriver of the coastal town of Canavieiras.