Baconia globosa, 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 : 205-207

Baconia globosa sp. n. Figs 56D57 F–GMap 18

Type locality.

ECUADOR: Orellana:Res. Ethnica Waorani [0.67°N, 76.43°W].

Type material.

Holotype male: "ECUADOR: Depto. Orellana: Res. Ethnica Waorani, 1km S Onkone Gare Camp, Trans. Ent., 0°39'10"S, 76°26'W, 220m, 22 June 1996, T.L. Erwin et al. collectors" / "Insecticidal fogging of mostly bare green leaves, some with covering of lichenous or bryophytic plants in terra firme forest. Project MAXUS Lot 1562 Trans. 5 Sta. 2" / "Caterino/Tishechkin Exosternini Voucher EXO-00817" (USNM).

Diagnostic description.

Length: 1.5mm, width: 1.4mm; body broadly oval, widest anterad, convex, glabrous; color rufescent, shining; head with frons slightly elevated over antennal bases, weakly depressed at middle, interocular margins strongly convergent dorsad, ground punctation fine, inconspicuous, with coarser punctures mainly at sides and along dorsal margin, frontal stria fragmented to absent, supraorbital stria present as several confluent punctures; antennal scape short, club rather large, round; epistoma truncate; labrum about 4 ×wider than long, apical margin emarginate; mandibles short; pronotum with sides weakly convergent in basal half, rounded to apex, lateral marginal and lateral submarginal striae merging behind anterior corner, detached from median part of anterior marginal stria, the sides of which recurve posterad about one-eighth behind anterior pronotal margin; pronotal disk narrowly depressed along anterolateral margin, ground punctation fine, very sparse, with small secondary punctures in lateral thirds, few larger punctures extending mediad along basal margin; elytra with upper epipleural stria complete, lower epipleural stria somewhat fragmented, outer subhumeral stria absent, inner subhumeral stria present only at extreme base, dorsal striae 1-2 obsolete from posterior one-fourth, 3rd stria present in basal one-third, 4th stria slightly longer, curving mediad toward scutellum at base, 5th stria absent, sutural stria very short, present only along middle one-fourth of suture, elytral disk with small secondary punctures in most of apical third; prosternal keel narrow, convex, weakly emarginate at base, with more or less complete carinal striae subparallel or diverging slightly to front; prosternal lobe about one-half keel length, apical margin rounded, marginal stria obsolete at sides; mesoventrite weakly produced at middle, with marginal stria complete; mesometaventral stria transverse, crenulate, continuous laterally with inner lateral metaventral stria, which extends obliquely posterad toward inner corner of metacoxa, outer lateral metaventral stria about half as long as inner, subparallel, continuing marginal mesoventral stria; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with single, complete lateral stria, curved inward posterad, disk impunctate at middle, ventrites 2-5 with fine 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 one fine marginal spine and short, oblique basal submarginal ridge; outer metatibial margin smooth; propygidium lacking basal stria, with fine ground punctation interspersed with dense, ocellate secondary punctures, propygidial gland openings inconspicuous; pygidium with fine ground punctation, with secondary punctures sparsely scattered, principally in basal half. Male genitalia (Figs 57 F–G): T8 as in Baconia gibbifer (Fig. 55A); S8 short, broad, sides slightly divergent to apex, apieces obliquely subtruncate, bearing fine apical setae, inner corners slightly produced, median emargination narrowly acute; T9 with dorsal plates rather broad near base, proximal apodemes short, sides uneven, narrowed strongly distally, apices prolonged, sinuate, somewhat digitiform, strongly bent ventrad, bearing single, inconspicuous, subapical seta on each side, ventrolateral apodemes nearly meeting at midline about one-third from apex, bluntly dentate; S9 stem narrow [broken off in type, probably dorsoventrally keeled], head gradually widened to apex, apical emargination shallow and sinuate; tegmen indistinguishable from that of Baconia tenuipes .

Remarks.

This species may be considered somewhat generalized in the group. Its body is weakly depressed and broad (Fig. 56D), with the sides only weakly rounded. It is similar to Baconia piluliforme in the absence of the 5th elytral stria and the presence of a crenulate mesometaventral stria. However, it does not have the strongly narrowed prosternal keel, has the lateral stria of the 1st abdominal ventrite longer, and has a relatively long 4th elytral stria which is detached from the base of the sutural stria. Confident identification requires examination of male genitalia to confirm the unusual shape of the 9th tergite, with ventrally pointed, digitiform apices.

Etymology.

This species is named in reference to its rather broadly oval body form.