Baconia foliosoma, 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 : 33-34

Baconia foliosoma sp. n. Figs 4 G–L5E–GMap 1

Type locality.

BRAZIL: Santa Catarina: Nova Teutonia [27.18°S, 52.38°W].

Type material.

Holotype male: "Brasilien, Nova Teutonia, 27°11'B, 52°23'L Fritz Plaumann, I:2:1949, 3-500 m" / "Baconia sp. det.R.Wenzel 19" / "FMNH-INS 0000 069 302" (FMNH).

Diagnostic description.

Length: 2.0mm, width: 1.7mm; body elongate oval, strongly depressed, glabrous; head, pronotum and pygidia dully metallic blue, elytra more distinctly colored, venter rufo-brunneus; frons rather flat, weakly depressed at middle, interocular margins weakly convergent dorsad, disk rather coarsely punctate, frontal stria present along inner margin of eye, only faintly indicated, fragmented across middle, supraorbital stria absent; epistoma flat, weakly emarginate apically; labrum about 4 ×wider than long, apex weakly bisinuate, surface with distinct reticulate microsculpture; mandibles short, only very bluntly dentate; pronotal sides weakly convergent in basal half, arcuate to apex, marginal stria complete around lateral and anterior margins, submarginal stria absent; pronotal disk depressed along anterior fourth of lateral margin, with only fine ground punctation over median two-thirds, with small secondary punctures interspersed at sides; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria impressed, fragmented over most of length, dorsal striae 1-4 complete, 5th stria present in apical two-thirds, sutural stria absent though with few punctures subserially arranged in apical half, elytral disk with scattered secondary punctures in apical fourth; prosternal keel broad, weakly convex, base broadly, weakly produced, carinal striae complete, separate, diverging slightly to front, slightly sinuate; prosternal lobe about two-thirds keel length, apical margin bluntly rounded, marginal stria obsolete at sides; mesoventrite broadly, shallowly emarginate, marginal stria interrupted for width of emargination; mesometaventral stria arched strongly forward, weakly crenulate, detached at sides, inner lateral metaventral stria originating close to mesocoxa, extending obliquely posterolaterad toward posterior corner of metepisternum, abbreviated apically, outer lateral metaventral stria absent, metaventral and 1st abdominal disks impunctate at middle; abdominal ventrite 1 with single, complete lateral stria; protibia with four marginal denticles, the basalmost weak, outer margin serrulate between; mesotibia with single marginal spine; outer metatibial margin smooth; pygidia short and wide, propygidium with complete transverse basal stria, small secondary punctures more or less uniformly separated by slightly more than their diameters; propygidial gland openings present behind transverse stria, about one-fourth from each side; pygidium with fine ground punctation and small, sparse secondary punctures more or less uniformly scattered. Male genitalia (Figs 4 G–L): T8 about as long as broad, sides weakly divergent apically, basal emargination abrupt, narrow, subacute, apical emargination narrow, equilateral, with ventrolateral apodemes narrow, separated by about one-half maximum T8 width, extending about midway distad beneath, obsolete in apical half; S8 divided, inner margins evenly divergent to broad, glabrous apices, outer margins subparallel to weakly convergent, apical guides only weakly developed in apical half; T9 with basal apodemes thin, just over half total length, T9 apices narrow, subacute, weakly opposed, glabrous, ventrolateral apodemes very weak, not projecting beneath; S9 weakly widened at base, head only weakly widened, with no development of apicolateral points, desclerotized along midline; tegmen with sides weakly narrowed to apex, undulating slightly, apex bluntly rounded, tegmen more or less straight in lateral aspect; median lobe about two-thirds tegmen length; basal piece about one-fifth tegmen length.

Remarks.

Baconia foliosoma can be distinguished from others in this complex by its dense frontal punctation (Fig. 5G), absence of sutural stria (Fig. 5E), subquadrate mesometaventral stria (Fig. 5F), and rather small propygidial punctures. It is most similar to Baconia sapphirina , which always has at least a small, distinct fragment of the sutural stria present. It is known only from the type.

Etymology.

This species’ name refers to its flattened, leaf-like body.