Baconia tenuipes, 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 : 199-203

Baconia tenuipes sp. n. Figs 56A57 A–B, J–KMap 18

Type locality.

ECUADOR: Orellana: Tiputini Biodiversity Station [0.635°S, 76.150°W].

Type material.

Holotype male: "ECUADOR: Depto. Orellana, Tiputini Biodiversity Station 0°37'55"S, 76°08'39"W, 220-250m. 1 July 1998 T.L.Erwin et al. collectors" / "insecticidal fogging of mostly bare green leaves, some with covering of lichenous or bryophytic plants Lot 1841 Trans. 5 Sta. 2" / "Caterino/Tishechkin Exosternini Voucher EXO-02868 ”” (USNM). Paratypes (8): ECUADOR: Orellana: 1: P. N. Yasuní, Est. Cient. Yasuní, 0°40.5'S, 76°24'W, 17-23.vi.1999, FIT, 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, 2.vii.1995, fogging, mostly bare green leaves, some with covering of lichenous or brophytic plants in terra firme forest, T. Erwin (USNM). 1: BOLIVIA: Cochabamba: 117 km E Cochabamba, at Lagunitas, 17°06'22"S, 65°40'57"W, 1000 m, 6-8.ii.1999, FIT, mountain evergreen forest, F. Genier (CMNC). BRAZIL: Manaus: 1: INPA, 2°25'S, 59°50'W, ii.1994, Winklered leaf litter, terra firme forest, R. Didham (BMNH). FRENCH GUIANA: 1: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 30.xi.2010, FIT, SEAG. 1:Montagne des Chevaux, 4°43'N, 52°24'W, 4.vii.2009, FIT, SEAG (CHND). 1: PERU: Madre de Dios: Res. Cuzco Amazonica, 15 km NE Pto. Maldonado, 12°33'S, 69°03'W, 200 m, 17.vi.1989, FIT, J. Ashe, R. Leschen (SEMC). 1: SURINAME: Brokopondo: Brownsberg Nat. Pre., 4°56'55"N, 55°10'53"W, 480 m, 23.vi.1999, FIT, Z. Falin (CMNC).

Diagnostic description.

Length: 1.3-1.7mm, width: 1.1-1.4mm; body subquadrate, weakly convex, glabrous; color rufescent, shining; head with frons weakly elevated over and between antennal bases, shallowly depressed at middle, interocular margins convergent dorsad, frontal disk mostly impunctate, with few punctures at sides and along dorsal margin, frontal stria absent or represented by short fragment along upper margin of eyes, supraorbital stria present; antennal scape very short, club large, elongate oval; epistoma weakly depressed beneath antennal bosses, apical margin truncate; labrum about 3 ×wider than long, apical margin emarginate; mandibles short, each with minute, acute basal tooth; pronotum transverse, short, with sides subparallel in basal half, arcuate to apex, lateral marginal stria descending to ventral edge about one-third behind anterior corner, extending around corner nearly meeting anterior marginal stria, which is recurved posterad for about one-sixth pronotal length behind each eye, the median pronotal gland opening displaced posterad to near its apex, lateral submarginal stria nearly complete, ending freely, pronotal disk with ground punctation fine, very sparse, with small secondary punctures in lateral thirds of disk; elytra with two complete epipleural striae, the lower somewhat fragmented, outer subhumeral stria absent, inner subhumeral stria present as short basal fragment, dorsal stria 1 obsolete in apical third, stria 2 nearly complete, 3rd stria present in basal half or slightly more, 4th stria present in basal half, narrowly arched to connect to base of sutural, 5th stria present as short basal fragment, sutural stria obsolete in apical one-third, elytral disk with small second ary punctures in most of apical half; prosternal keel narrowly convex, more strongly narrowed anteriorly, emarginate at base, with carinal striae fragmented to obsolete; prosternal lobe short, deflexed, apical margin broadly arcuate, marginal stria more or less complete; mesoventrite narrowly produced at middle, with marginal stria com plete; mesometaventral stria present, crenulate across middle, continued by inner lateral metaventral stria, extending obliquely posterad to near inner corner of metacoxa, outer lateral metaventral stria very short, present only behind mesocoxa; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with single, complete lateral stria, ventrite lacking transverse anterior marginal stria, disk impunctate at middle, ventrites 2-5 with fine, moderately dense punctures across width; protibia narrow, lacking median and basal marginal denticles, margin straight, serrulate; mesofemur with posterior marginal stria curving anterad along apical margin; mesotibia with subapical marginal spine and oblique, basal submarginal ridge; outer metatibial margin smooth; propygidium lacking basal stria, with fine ground punctation interspersed with small, ocellate secondary punctures, propygidial gland openings inconspicuous; pygidium with fine ground punctation, with coarser secondary punctures more or less uniformly interspersed. Male genitalia (Figs 57 A–B, J–K): T8 as in Baconia gibbifer (Fig. 55A); S8 slightly longer than wide, weakly widened to apex, basal emargination broad and deep, apices subtruncate, very slightly oblique, laterally well-sclerotized and bearing short fringe of inconspicuous setae, inner corners weakly produced, with narrow, subacute median emargination; T9 as in Baconia piluliformis (Fig. 55E); S9 stem narrow, strongly dorsoventrally keeled, head gradually widened to apex, apical emargination shallow and sinuate; tegmen widest just distad base, sides evenly narrowed to apex, thick, curving ventrad in apical half, with eversible subapical denticles ventrally; median lobe simple, about one-third tegmen length; basal piece one-third tegmen length.

Remarks.

The body shape in Baconia tenuipes is more distinctly subdepressed and broad, nearly subquadrate, than in other species in this group (Fig. 56A). The antennal bosses are weak, pronotal punctures coarser and more widespread, recurved anterior marginal stria short, basal fragment of the 5th elytral stria present, and the 4th stria more narrowly arched anteriorly, connected to the sutural stria basally.

Etymology.

This species’ name refers to its very narrow protibiae.