Baconia guartela, 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 : 114-115

Baconia guartela sp. n. Figs 32 D–F33L–PMap 9

Type locality.

BRASIL: Paraná: Parque Estad. Guartelá [24.5663°S, 50.2570°W].

Type material.

Holotype male: "BRASIL: Paraná, Mpio. Tibagi, Parque Estad. Guartelá 24.5663°S, 50.2570°W. F.I.T., forest. 12-15.xii.2011. AT196 M.S.Caterino & A.K.Tishechkin" / "Caterino DNA Voucher Extraction: MSC-2278, sp.: Baconia ~angusta2, Extraction Date: i.24.2012" / "Caterino/Tishechkin Exosternini Voucher EXO-00934" (UFPR).

Diagnostic description.

Length: 1.6mm, width: 1.1mm; body elongate, parallel-sided, subdepressed, glabrous; color rufescent, shining; frons broad, weakly elevated over antennal bases, more or less flat across middle, interocular margins convergent dorsad, frontal punctation fine, sparse, only few larger punctures near vertex, frontal stria absent, supraorbital stria well impressed; antennal scape short, club large, rounded; epistoma flat, apex weakly emarginate; labrum about 3 × wider than long, slightly narrowed to apex, apical margin faintly arcuate; mandibles short, each with median tooth; pronotum with sides subparallel in basal two-thirds, rounded to apex, lateral marginal and lateral submarginal striae very close through out, submarginal stria ending freely near anterior corner, marginal stria continuous along anterior margin, slightly removed from margin, weakly crenulate; pronotal disk narrowly depressed along anterolateral margin, ground punctation fine, lacking secondary punctures along middle third, sparsely impressed at sides; elytra with two more or less complete epipleural striae, outer and inner subhumeral striae absent, dorsal stria 1 present in basal half only, stria 2 nearly complete, striae 3-4 progressively abbreviated apically, basal arch of 4th stria subangulate, meeting base of sutural stria, 5th stria absent, sutural stria obsolete in apical fourth, elytral disk with small, shallow secondary punctures in apical fourth, particularly toward suture; prosternal keel weakly convex between striae, emarginate at base, carinal striae weakly divergent basally and apically; prosternal lobe about one-half keel length, apical margin rounded, marginal stria obsolete at sides; mesoventrite produced at middle, marginal stria interrupted for width of median process; mesometaventral stria weakly arched forward, crenulate, continued by inner lateral metaventral stria obliquely posterad toward middle of metacoxa, outer lateral metaventral stria present as very short postcoxal fragment; metaventral disk impunctate at middle; abdominal ventrite 1 with inner and outer lateral striae nearly complete, slightly abbreviated apically, disk impunctate at middle, ventrites 2-5 nearly impunctate across middle; protibia narrow, with three weak marginal denticles, the distal two relatively close, margin serrulate between; mesofemur with posterior marginal stria largely confined to posterior margin; mesotibia with two distinct marginal spines; outer metatibial margin smooth; propygidium lacking basal stria, with moderately large ocellate punctures more or less uniformly separated by about their diameters, propygidial gland openings inconspicuous; pygidium with fine ground punctation sparse, small secondary punctures diminishing from base to apex. Male genitalia (Figs 33 L–P): T8 subquadrate, slightly longer than broad, sides straight, parallel, basal emargination very shallow, basal rim not strongly sclerotized, apex shallowly emarginate, ventrolateral apodemes poorly developed, inner apices separated by three-fourths T8 width; S8 divided, slightly shorter than T8, inner margins approximate in basal third, divergent apically, outer margins diverging apically, apical guides closed, apical velar membrane absent, apex with 5-6 conspicuous setae; [T9-10 poorly preserved and prepared]; S9 forming a rather shallow ‘V’, stem absent, base bluntly rounded, apices divergent and truncate; tegmen moderately broad, widest near base, narrowed distally, apices obliquely truncate, tegmen in lateral aspect more or less flat, apex very slightly bent ventrad; median lobe long, about two-thirds tegmen length; basal piece long, over one-half tegmen length, strongly bent relative to tegmen.

Remarks.

The simple, ‘V’ -shaped spiculum gastrale is unique to this species, as is the distinct angle between the basal piece and the tegmen of the aedeagus. Externally, its relatively smooth, impunctate frons (Fig. 32F), and complete, transverse, crenulate mesometaventral stria (Fig. 32E) will help to characterize it.

Etymology.

This species is named for the Cânion Guartelá, where the authors collected the type during a memorable 2011 expedition. The name is a noun in apposition.