Baconia oblonga, 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 : 167-168

Baconia oblonga sp. n. Figs 47 D–E48A–FMap 14

Type locality.

FRENCH GUIANA: Réserve des Nouragues [4.038°N, 52.673°W].

Type material.

Holotype male: "GUYANE FR., Régina, Réserve des Nouragues 4°2.27'N, 52°40.35'W, Piège d’interception 10 Oct 2009. SEAG leg." / "Caterino/Tishechkin Exosternini Voucher EXO-00460" (MNHN). Paratypes (3): FRENCH GUIANA: 1: Rés. des Nouragues, Camp Inselberg, 4°05'N, 52°41'W, 8.x.2010, FIT, SEAG, 1: 9.ix.2010, FIT, SEAG (CHND). GUYANA:1: Region 8:Iwokrama Field Stn., Pakatau hills, 4°44'54"N, 59°1'36"W, 70 m, 25-29.v.2001, FIT, R. Brooks & Z. Falin (SEMC).

Diagnostic description.

Length: 1.1-1.2mm, width: 0.8-0.9mm; body narrowly elongate oval, parallel-sided, weakly depressed, glabrous; color rufescent to rufobrunneous; head with frons very shallowly depressed at middle, slightly elevated over antennal bases, ground punctation conspicuous, moderately dense, not distinct from secondary punctures, frontal stria at most present as very short fragment near upper edge of eye, supraorbital stria present; antennal scape short, club oblong, slightly expanded apically; epistoma weakly convex along apical margin, faintly emarginate, with distinct microsculpture along distal and lateral margins; labrum about 4 ×wider than long, apical margin slightly emarginate; both mandibles with small, acute basal tooth; pronotum with sides subparallel in basal two-thirds, weakly arcuate to apex, lateral marginal stria may merge with or be displaced by lateral submarginal stria, anterior marginal stria detached from lateral marginal, diverging from margin behind eyes, pronotal disk with coarse secondary punctures in lateral thirds and behind anterior margin, with only fine ground punctation in posterior half of middle; elytra with two epipleural striae, outer subhumeral stria absent, inner subhumeral nearly complete, may be slightly abbreviated apically, dorsal striae 1-4 complete to base, slightly, progressively abbreviated apically, 4th stria not curved mediad at base, 5th dorsal stria abbreviated at base, sutural stria extending further basad than 5th, abbreviated apically, elytral disk with few coarse punctures in apical one-third; prosternal keel flat, moderately broad, very shallowly emarginate at base, carinal striae slightly convergent anterad; prosternal lobe about two-thirds keel length, apical margin broadly rounded, with marginal stria present only at middle; mesoventrite very weakly produced at middle, with marginal stria broadly interrupted; mesometaventral stria arched strongly forward to near mesoventral margin, narrowly separated from base of inner lateral metaventral stria which extends obliquely posterad toward middle of metacoxa, outer lateral metaventral stria very short, oblique; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with single inner lateral stria, lacking coarse punctures on middle part of disk, ventrites 2-5 with sparse punctures at sides, 4th with dense, deep punctures across middle, the other ventrites sparsely punctate medially; protibia tridentate, outer margin finely ser rulate; mesotibia with two marginal spines; outer metatibial margin with fine subbasal denticle; propygidium lacking basal stria, with fine, sparse ground punctation and coarser, ocellate secondary punctures irregularly scattered, propygidial gland openings small, located about one-third behind anterior margin, one-fourth from lateral corner, the immediately surrounding disk devoid of punctures; pygidium with fine, conspicuous ground punctation slightly denser apically, and slightly coarser secondary punctures present in basal two-thirds. Male genitalia (Figs 48 A–F): T8 shallowly emarginate at base, ventrolateral apodemes with inner apices separated by about two-thirds T8 width, projecting beneath just beyond ventral midpoint, obsolete apically, apical margin shallowly emarginate; S8 with halves fused along midline, basal emargination broad, shallow, basal apodemes broadly, obliquely truncate, sides strongly narrowed to beyond middle, expanded to apex, apices broadly, obliquely truncate, densely setose, separated by apical emargination about one-third total width; T9 with very short, subacute basal apodemes, halves narrowly separated dorsally, ventrolateral apodemes bluntly produced beneath, nearly meeting, apices narrowly rounded, with single subapical seta on each side; T10 elongate, narrowed basally, with weak apical emargination; S9 with long narrow, medially keeled stem, head abruptly widened, sides parallel to apex, apices acute, widely separated, apical emargination broad, shallow; tegmen with sides weakly widened from base, subparallel to just beyond midpoint, narrowed to apex, apices subacute, tegmen evenly but not strongly curved in lateral aspect, with eversible subapical denticles ventrally; median lobe about one-fourth tegmen length; basal piece about one-fourth tegmen length.

Remarks.

This species bears considerable resemblance to Baconia lescheni , above, particularly in their relatively small, narrow, subparallel-sided body form (Fig. 47E), and in the straight (not basally curved mediad) 4th elytral stria. However, the nearly complete inner subhumeral stria, detached and slightly recurved anterior marginal pronotal stria, and much more densely punctate frons (Fig. 47D) will distinguish Baconia oblonga easily.

Etymology.

This species is named for its oblong body form.