Baconia gibbifer, 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 : 192-197

Baconia gibbifer sp. n. Figs 1C54 A–F55A–B, D, F, H–IMap 17

Type locality.

ECUADOR: Orellana, Yasuní Research Station [0.674°S, 76.398°W].

Type material.

Holotype male: "ECUADOR: Napo, mid. Rio Tiputini, Yasuní Res. Stn. 0°40.5'S, 76°24'W FIT#M1, 7-13 Jul 1999 AKT#088 C.Carlton & A.Tishechkin" / “LSAM0012899” (FMNH). Paratypes (10): ECUADOR:1: Orellana: Est. Biodiv. Tiputini, 0.6376°S, 76.1499°W, 2-9.vi.2011, FIT, M. Caterino & A. Tishechkin, DNA Extract MSC-2126, EXO-00628, 1: 30.vii.2008, Day FIT, A. Tishechkin, DNA Extract MSC-1898, EXO-02850, 2: 220 m, 5-25.ix.2000, D. Inward & K. Jackson; 1: P. N. Yasuní, Est. Cient. Yasuní, 0°40.5'S, 76°24'W, 16-17.vii.2008, FIT, A. Tishechkin, 1: 18-23.vi.1999, FIT, A. Tishechkin (LSAM), 2: 23-30.vi.1999, FIT, C. Carlton & A. Tishechkin (LSAM), 1: 28. vi– 5.vii.1999, FIT, A. Tishechkin (LSAM), 1: 5-11.vii.1999, FIT, C. Carlton & A. Tishechkin (LSAM).

Other material.

(60) BRAZIL: 2: Manaus: INPA, 2°25'S, 59°50'W, iii.1994, Winklered leaf litter, terra firme forest, R. Didham; 1: Mato Grosso:Mpio. Cotriguaçu, Fazenda São Nicolau, Matinha, 9°50.3'S, 58°15.05'W, 3.iv.2009, FIT, F. Vaz-de-Mello (CEMT); 1: Pará: Belem, Utinga, IPEAN, 1°27'S, 48°26'W, viii.1985, FIT (CHND), 1: xi.1984, FIT (AKTC), 1: xii.1984, FIT (MSCC); 2: Carajas (Serra Norte), 6°04'S, 50°12'W, v.1985, FIT; 2: Tucuruí, 3°45'S, 49°40'W, 10-29.vii.1985, FIT, 1: 19. vi– 7.vii.1986, FIT, 1: v.1986, FIT (CHND). COLOMBIA: 3: Vaupés: P. N. Mosiro-Itajura, Centro Ambiental, 1°04'S, 69°31'W, 60 m, 20-30.i.2003, FIT, D. Arias & M. Sharkey (IAVH, FMNH). FRENCH GUIANA: 1: Rés. des Nouragues, Camp Inselberg, 4°05'N, 52°41'W, 20.vii.2009, FIT, SEAG (MNHN), 6:25.i.2011, FIT, SEAG (CHND), 1:30.ix.2010, FIT, SEAG (AKTC); 2:16.ix.2010, FIT, S. Brule (UFPR); 1: Rés. des Nouragues, Régina, 4°2.27'N, 52°40.35'W, 10.x.2009, FIT, SEAG (CHND), 2:8.ix.2009, FIT, SEAG (CHND, AKTC); 1:Res. Tresor, rte. de Kaw, Pk18, 4°36.63'N, 52°16.74'W, 225 m, 13.x.2009, FIT, SEAG (CHND), 1: 26.ix.2009, FIT, SEAG (CHND); 1:18.4 km SSE Roura, 4°36'38"N, 52°13'25"W, 240 m, 29. v– 10.vi.1997, FIT, J. Ashe & R. Brooks (SEMC); 1:8.4 km SSE Roura, 4°40'41"N, 52°13'25"W, 200 m, 29. v– 10.vi.1997, FIT, J. Ashe & R. Brooks (SEMC); 3: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 14.ii.2011, FIT, SEAG (CHND), 1:17.i.2011, FIT, SEAG (CHND), 1:17.ix.2010, FIT, S. Brule (UFPR), 1:20.xii.2010, FIT, SEAG (CHND), 1:30.xi.2010, FIT, SEAG (CHND), 1:31.i.2011, FIT, SEAG (CHND), 4:7.ii.2011, FIT, SEAG (CHND, MSCC, AKTC), 1:Cayenne, 33.5 km S and 8.4 km NW of Hwy N2 on Hwy D5, 4°48'18"N, 52°28'41"W, 30 m, 29.v-9.vi.1997, FIT, J. Ashe & R. Brooks (SEMC); 1:Mont tabulaire Itoupé, 3°1.82'N, 53°6.40'W, 400 m, 17.iii.2010, FIT, SEAG (CHND); 1:Mont tabulaire Itoupé, 3°1.38'N, 53°5.73'W, 570 m, 31.iii.2010, FIT, SEAG (CHND); 1:Montagne des Chevaux, 4°43'N, 52°24'W, 23.ii.2009, FIT, SEAG (CHND), 1:4.vii.2009, FIT, SEAG (CHND); 1:20.vi.2009, FIT, SEAG (CHND). GUYANA:1: Region 8:Iwokrama Field Stn., 4°40'19"N, 58°41'4"W, 60 m, 30. v– 2.vi.2001, FIT, R. Brooks & Z. Falin (SEMC). PERU:1: Loreto: Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240 m, 24.vii.1993, FIT, R. Leschen (SEMC); 2: Madre de Dios: CICRA, Rio Los Amigos, 25-150 m, 18-21.xi.2006, FIT, A. Asenjo (MUSM), 1: 24-26.xi.2006, FIT, A. Asenjo (MUSM); 1: P. N. Manu, Est. Biol. Cocha Cashu, 11°53'45"S, 71°24'24"W, 350 m, 17-19.x.2000, FIT, R. Brooks (SEMC); 1: Pantiacolla Lodge, Alto Madre de Dios R., 12°39.3'S, 71°13.9'W, 420 m, 14-19.xi.2007, FIT, D. Brzoska (SEMC). SURINAME: 1: Pará: nr. Overbridge River Resort, 5°31.8'N, 55°3.5'W, 15-18.ii.2010, FIT, C. Gillet, P. Skelley, W. Warner (FSCA); 2: Sipaliwini: CI-RAP Surv. Camp 1: on Kutari River, 2°10.521'N, 56°47.244'W, 228 m, 19-24.viii.2010, FIT, T. Larsen & A. Short (SEMC, MSCC); VENEZUELA: 1: Amazonas: Cerro de la Neblina basecamp, 0°50'N, 66°10'W, 140 m, 10-20.ii.1985, FIT, rainforest, P. Spangler, R.A. Faitoute & W. Steiner (USNM).

Diagnostic description.

Length: 1.4-1.5mm, width: 1.2-1.5mm; body elongate oval, strongly convex, glabrous; color rufescent, shining; head with frons elevated over and between antennal bases, narrowly depressed at middle, interocular margins convergent dorsad, frontal disk mostly impunctate, with few punctures at sides and along dorsal margin, frontal stria represented by short fragment along upper margin of eyes, supraorbital stria short, irregular; antennal scape very short, club large, elongate oval, with small, round median sensorium on upper surface distad the typical four sensoria (Fig. 54E); epistoma narrowly, transversely depressed beneath antennal bosses, apical margin truncate; labrum about 3 ×wider than long, apical margin deeply emarginate; mandibles short, each with minute, acute basal tooth; pronotum transverse, short, with sides strongly arcuate to apex, lateral marginal stria descending to ventral edge about one-third behind anterior corner, extending around corner to meet anterior marginal stria, which is recurved posterad for almost one-third pronotal length behind each eye (median pronotal gland opening displaced posterad to its apex), lateral submarginal stria nearly complete, merging with marginal stria or ending freely, pronotal disk with ground punctation fine, very sparse, with small secondary punctures mainly in anterolateral corners; elytra with upper epipleural stria complete, the lower somewhat fragmented, outer and inner subhumeral striae absent, dorsal stria 1 strongly shortened, present only in basal one-half, striae 2-3 nearly complete, 4th stria present only as short basal arch, 5th stria absent, sutural stria abbreviated slightly from base and apex, elytral disk with small secondary punctures in most of apical one-fourth, extending further anteriorly mediad 3rd stria; prosternal keel narrowly convex, narrowing anteriorly, emarginate at base, with more or less complete carinal striae converging to front; prosternal lobe very short, slightly deflexed, apical margin broadly arcuate, marginal stria obsolete at sides; mesoventrite weakly produced at middle, with marginal stria complete; mesometaventral stria absent from middle; inner lateral metaventral stria present as isolated oblique stria from mesometaventral suture to near inner corner of metacoxa, outer lateral metaventral stria very short, present only behind mesocoxa; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with lateral striae abbreviated posteriorly, usually continuous with complete anterior marginal stria, 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, with transverse apical setal series; 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 evident, situated about one-fourth behind anterior margin and nearly one-third from lateral margin; pygidium with fine ground punctation, with small secondary punctures sparsely interspersed, principally in basal half. Male genitalia (Figs 55 A–B, D, F, H–I): T8 slightly longer than wide, rather narrowly, arcuately emarginate at base, sides rounded, not markedly narrowing apically, ventrolateral apodemes with inner apices widely separated, projecting beneath to about ventral midpoint, obsolete apically, apical margin subacutely emarginate; S8 more or less flat, sides slightly upturned, diverging to apex, halves fused along midline, basal emargination broad, shallow, apical guides absent, apical lobes with few very fine, inconspicuous setae; T9 with dorsal plates rather broad, proximal apodemes reduced, short, sides curving, converging to obliquely truncate apices bearing single subapical seta on each side, ventrolateral apodemes nearly meeting at midline about one-third from apex; S9 stem narrow, weakly dorsoventrally keeled, head rounded, apical emargination shallow and sinuate; tegmen sides subparallel in basal half, strongly narrowed to apex, thick, strongly curved ventrad in apical half, with eversible subapical denticles ventrally; median lobe simple, about one-fifth tegmen length; basal piece one-third tegmen length.

Remarks.

This, the most common and widespread species in this group, may be separated by the others by its strongly recurved anterior marginal pronotal stria (Fig. 54D), short 4th, and absent 5th elytral striae (Fig. 54A), the basal arch of the 4th stria narrowly separated from the sutural stria, absence of mesometaventral stria (Fig. 54C), and usually complete stria across the anterior margin of abdominal ventrite 1 (Fig. 54C). The species shows considerable variability in minor characters of striation and punctation, and we limit the type series to those specimens from Amazonian Ecuador.

Etymology.

This species’ name refers to its broadly rounded, humpbacked appearance.