Baconia applanatis, 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: 40-41

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scientific name

Baconia applanatis

sp. n.

Baconia applanatis   sp. n. Fig. 6EMap 2

Type locality.

COSTA RICA: Guanacaste: Sta. Rosa National Park [10.3°N, 85.62°W].

Type material.

Holotype female: "Est. Sta. Rosa, 300m, P.N. Sta. Rosa, Prov. Guanacaste, Costa Rica, 3 a 12 jun 1992, III curso Parataxon. L-N 313000,359800" / "INBIO CRI000427988" (INBIO). Paratype female (1): COSTA RICA: Guanacaste: 4 km SSW Guayabo, 1600 ft, 4.vii.1993, M.S. Caterino (MSCC).

Other material.

1: FRENCH GUIANA: Montagne des Chevaux, 4°43'N, 52°24'W, FIT, SEAG (CHND).

Diagnostic description.

Length: 2.1-2.2mm, width: 1.7-1.8mm; body broadly subquadrate, strongly depressed, glabrous; head and pronotum metallic greenish-blue, elytra and pygidia metallic blue, contrasting slightly with pronotum dorsally, venter rufo-brunneus; frons wide, very weakly depressed at middle, interocular margins convergent dorsad, ground punctation fine, with few coarser punctures at middle and toward vertex, frontal stria present along inner margin of eye, narrowly interrupted over antennal bases and broadly interrupted across middle, median fragments may be very weak or absent, supraorbital stria absent; antennal scape short, apex obliquely truncate, club asymmetrically oblong; epistoma truncate apically; labrum about 3 ×wider than long, apex weakly bisinuate; mandibles short, each with acute basal tooth; pronotal sides almost evenly arcuate to apex, lateral marginal stria complete around lateral and anterior margins, submarginal stria absent, pronotal disk with only fine ground punctation over median three-fourths of disk, with small secondary punctures interspersed only at sides; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria may be impressed over much of its length, but generally fine, fragmented, rarely absent, dorsal striae 1-2 more or less complete, 2nd may be slightly abbreviated basally, 3rd stria very fine, scratchlike, present in basal half only, 4th, 5th and sutural striae absent, elytral disk with scattered secondary punctures in apical one-third; prosternal keel broad, flat, very weakly emarginate at base, carinal striae complete, separate, sinuate between coxae, subparallel anterad; prosternal lobe about one-half keel length, apical margin rounded, marginal stria present at middle, fragmented to sides; mesoventrite weakly produced at middle, marginal stria complete; mesometaventral stria absent, inner lateral metaventral stria originating close to mesocoxa, curving posterolaterad toward outer third of metacoxa, outer lateral metaventral stria absent, metaventral and 1st abdominal disks impunctate at middle; abdominal ventrite 1 with complete inner lateral stria and posterior fragment of outer stria; protibia with three marginal denticles, plus a very small basal spine, outer margin serrulate between spines; mesotibia with single marginal spine, a subcarinate ridge extending to it from base; outer metatibial margin smooth; pygidia short and wide, propygidium with complete transverse basal stria, coarse secondary punctures irregularly separated by their diameters or less; propygidial gland openings inconspicuous; pygidium with sparse ground punctation and small secondary punctures densely interspersed. Male: not known.


This strongly depressed species is similar in size to the preceding several species, but may be easily distinguished by the complete absence of the 4th, 5th, and sutural elytral striae (Fig. 6E). The 3rd stria is also strongly abbreviated posteriorly, represented by only a fine stria in the basal half.


This species’ name refers to its strongly flattened body form.