Baconia tuberculifer, 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 : 203-205

Baconia tuberculifer sp. n. Figs 56 B–C57C–E, L–MMap 18

Type locality.

PANAMA: Colón: San Lorenzo Forest [9.28°N, 79.97°W].

Type material.

Holotype male: "PANAMA: Colón Prov., San Lorenzo Forest, STRI crane site. 9°17'N, 79°58'W, FIT-Z-3. 14-15 May 2004 A.Tishechkin. AT-440" / "Caterino/Tishechkin Exosternini Voucher EXO-00515" (FMNH). Paratypes (17): COSTA RICA:2: Cartago: P. N. Tapanti, Quebrada Segunda, 1250 m, vii.1992, G. Mora (INBI); 1: Heredia: 16 km SSE La Virgen, 10°16'N, 84°05'W, 1050-1150 m, 9-14.iii.2001, FIT, primary forest, E. Riley (TAMU); 2: Puntarenas: Est. Biol. Las Cruces, Coto Brus, 8°17'N, 82°57'W, 1100 m, 18-20.vi.2005, FIT, M. Ferro (AKTC, LSAM), 1: 1100 m, 22-23.iii.2002, FIT, A. Tishechkin (AKTC), 2: 1000 m, 22-23.iii.2002, FIT, A. Cline & A. Tishechkin (LSAM), 1: 1330 m, 28-31.v.2004, FIT, J. Ashe, Z. Falin, I. Hinojosa (SEMC); 1: P. N. Amistad, Est. Las Mellizas, Fca. Cafrosa, 1300 m, iii.1990, M. Ramirez & G. Mora (INBI); 1: San Vito, Las Cruces, 17. viii– 12.ix.1982, FIT, B. Gill (BDGC), 1: 1200 m, vii.1982, B. Gill (CHSM). PANAMA:1: Chiriquí: Res. La Fortuna Estacion Biologica, 08°43'18"N, 82°14'17"W, 3900 ft, 4-10.viii.1999, FIT, Schaffner & J. Woolley (TAMU); 1: La Fortuna Dam, 1200 m, 14. vi– 16.vii.1982, B. Gill (BDGC); 1: La Fortuna, "Hydro Trail", 08°42'N, 82°14'W, 1150 m, 23. v– 9.vi.1995, FIT, J. Ashe & R. Brooks (SEMC); 1: Colón: P. N. San Lorenzo, STRI Crane Site, 9°17'N, 79°58'W, 20-21.v.2004, FIT, A. Tishechkin (GBFM); 1: Panamá:Chepo-Cartí Rd., 400 m, vi.1982, FIT, B. Gill (BDGC).

Other material.

(14) COSTA RICA:1: Guanacaste: P. N. Guanacaste, 9 km S Santa Cecilia, Est. Pitilla, 700 m, 27. vii– 14.viii.1992, P. Rios (INBI), 2: x.1994, C. Moraga (INBI). MEXICO: 1: Chiapas: Parque Laguna Belgica, 19.3 km N Ocozocoautla, 970 m, 12.vi.1991, FIT, J. Ashe (SEMC), 1: 8.vi.1991, FIT, J. Ashe (CHSM); 1: 16 km NW Ocozocoautla, 970 m, 31.v.1990, H. & A. Howden (CMNC); 1: Veracruz: Est. Biol. Los Tuxtlas, 33 km N Catemaco, 22-29.vi.1984, D. Lindeman (SEMC). ECUADOR:1: Napo: Est. Biol. Jatun Sacha, 21 km E Puerto Napo, 400 m, 18.vii.1994, FIT, lowland rainforest, Levy & F. Genier (CMNC); 1: Orellana: Yasuní Res. Stn., 0°40.5'S, 76°24'W, 23-30.vi.1999, FIT, C. Carlton & A. Tishechkin (LSAM), 2: 5-11.vii.1999, FIT, C. Carlton & A. Tishechkin (LSAM). PERU:1: Junín: 11 km NE Puerto Ocopa, Los Olivos, 11°3.00'S, 74°15.52'W, 1200 m, 26-27.iii.2009, FIT, A. Tishechkin, DNA Extract MSC-2152, EXO-00680, 1: 30-31.iii.2009, A. Tishechkin, DNA Extract MSC-2161, EXO-00684, 1: 30-31.iii.2009, A. Tishechkin, DNA Extract MSC-2414, EXO-00643 (AKTC, MSCC, FMNH).

Diagnostic description.

Length: 1.3-1.6mm, width: 1.2-1.4mm; body subquadrate, weakly convex, glabrous; color rufescent, shining; head with frons elevated over and between antennal bases, narrowly depressed at middle, interocular margins weakly convergent dorsad, frontal disk with only very fine ground punctation, frontal stria absent or represented by short fragment along upper margin of eyes, supraorbital stria weakly impressed to absent; antennal scape very short, club large, elongate oval; epistoma weakly depressed beneath antennal bosses, with weak tubercle medially, apical margin truncate; labrum 2.5 –3×wider than long, apical margin shallowly emarginate; mandibles short, each with small, acute basal tooth; pronotum transverse, with sides weakly convergent in basal half, arcuate to apex, lateral marginal stria descending to ventral edge about one-third behind anterior corner, extending around corner nearly meeting anterior marginal stria, which is recurved posterad for about one-sixth pronotal length behind each eye, the median pronotal gland opening displaced posterad to near its apex, lateral submarginal stria nearly complete, diverging from margin to front, marginal bead somewhat swollen in anterior half, disk depressed along submarginal stria, with ground punctation very fine, inconspicuous, with few faint, or no secondary punctures laterally; elytra with complete upper epipleural striae, lower epipleural stria may be weak or fragmented, outer and inner subhumeral striae absent, dorsal stria 1 obsolete in apical half to one-third, stria 2 more nearly complete, 3rd stria present in basal half or slightly more, 4th stria present in basal one-fourth or less, basally arched toward scutellum, 5th stria absent, sutural stria usually abbreviated basally, but may be connected to arch of 4th stria, elytral disk with small secondary punctures in most of apical half, denser toward midline; prosternal keel moderately narrow, convex, emarginate at base, with carinal striae divergent anterad; prosternal lobe short, deflexed, apical margin broadly arcuate, marginal stria more or less complete; mesoventrite produced at middle, with marginal stria complete; mesometaventral stria present, sinuate, weakly crenulate across middle, continued by inner lateral metaventral stria, extending obliquely posterad toward middle of metacoxa, abbreviated at apex, outer lateral metaventral stria short, curved behind mesocoxa; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with single, complete lateral stria, ventrite lacking transverse anterior marginal stria, disk impunctate at mid dle, ventrites 2-5 with fine, moderately dense punctures across width; protibia narrow, lacking median marginal denticle, margin more or less straight, serrulate; mesofemur with posterior marginal stria not curving around apical margin; mesotibia with subapical marginal spine and oblique, basal submarginal ridge; outer metatibial margin smooth; propygidium lacking basal stria, with fine ground punctation very sparsely interspersed with small, ocellate secondary punctures, propygidial gland openings inconspicuous; pygidium with fine ground punctation, with few coarser secondary punctures in basal half of disk. Male genitalia (Figs 57 C–E, L–M): T8 as in Baconia gibbifer (Fig. 55A); S8 subquadrate, slightly wider than long, basal emargination shallow, arcuate, apices with two transverse, well-sclerotized disks bearing faint fringe of apical setae, oblique strengthening ridges extending from disks to basal midpoint; T9 with dorsal lobes broad, proximal apodemes obsolete, apices prolonged, divergent, sinuate, deflexed, bearing single subapical seta; S9 stem narrow, strongly dorsoventrally keeled, head gradually widened to apex, apical emargination shallow and sinuate, desclerotized medially; tegmen with sides subparallel in basal fourth, slightly concavely narrowed to very narrow apices, rather thick in lateral aspect, curving ventrad in apical half, with eversible subapical denticles ventrally; median lobe simple, about one-fourth tegmen length; basal piece one-third tegmen length.

Remarks.

Most individuals of this species can be recognized by the presence of a distinct epistomal tubercle (Fig. 56B). However, this is more conspicuous in the ‘typical’ populations from Costa Rica and Panama. Where this is not as distinct, the species also exhibits a relatively impunctate frons and pronotum and a markedly swollen pronotal marginal bead (Fig. 56C). The species’ fundamental character is a highly distinctive male 8th sternite in which the apices form strongly sclerotized disk-like plates. The elongate and downturned apices of the 9th tergite are also unique (though somewhat similar to those in Baconia globosa , below.) We restrict the type series to localities in Costa Rica and Panama, where the epistomal tubercle is relatively distinct.

Etymology.

This species is named for the epistomal tubercle that characterizes typical examples.