Baconia punctiventer, 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 : 151-154

Baconia punctiventer sp. n. Fig 42 O–Q 43BMap 12

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, 2 July 1995, 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 1064 Trans. 7 Sta. 4" / "Caterino/Tishechkin Exosternini Voucher EXO-00505" (USNM). Paratypes (13): ECUADOR:1: Orellana: Est. Biodiv. Tiputini, 0°37'55"S, 76°08'39"W, 220-250 m, 22.x.1998, fogging, mostly bare green leaves, some with covering of lichenous or brophytic plants, T. Erwin (USNM), 1: 23.x.1998, fogging, T. Erwin (USNM), 1: 24.x.1998, fogging, T. Erwin (USNM), 1: P. N. Yasuní, Est. Cient. Yasuní, 0°40.5'S, 76°24'W, 20-24.vii.2008, Malaise/FIT, canopy, A. Tishechkin, DNA Extract MSC-1889, EXO-00451; 1: Res. Ethnica Waorani, 1 km S Onkone Gare Camp, Trans. Ent., 0°39'10"S, 76°26'W, 220 m, 1.vii.1995, fogging, T. Erwin (USNM), 1: 2.vii.1995, fogging, T. Erwin (USNM), 1: 22.vi.1996, fogging, T. Erwin (USNM), 1: 25.vi.1994, fogging, T. Erwin (USNM), 1: 26.vi.1996, fogging, T. Erwin (USNM), 1: 3.vii.1994, fogging, T. Erwin (USNM), 1: 7.vii.2006, fogging, T. Erwin, DNA Extract MSC-2134, EXO-00671, 1: 0°39'26"S, 76°27'11"W, 216 m, 21.i.2006, fogging, T. Erwin (USNM), 1: 22.x.2005, fogging, T. Erwin (USNM).

Other material.

(33) 1: ECUADOR: Orellana: P. N. Yasuní, Est. Cient. Yasuní, 0°40.5'S, 76°24'W, 29. vi– 17.vii.1999, FIT, mid canopy, A. Tishechkin (LSAM); 1: Res. Ethnica Waorani, 1 km S Onkone Gare Camp, Trans. Ent., 0°39'26"S, 76°27'W, 216 m, 23.i.2006, fogging, T. Erwin (USNM); 2: Est. Biodiv. Tiputini, 0°37'55"S, 76°08'39"W, 220-250 m, 9.ii.1999, fogging, T. Erwin (USNM), 2: 23.x.1998, fogging, T. Erwin (USNM), 1: 4.vii.1998, fogging, T. Erwin (USNM); 1:canopy fogging, T. Erwin, DNA Extract MSC-1903, EXO-02697 (MSCC). BOLIVIA: 1: Santa Cruz:Hotel Flora y Fauna, 4-5 km SSE Buena Vista, 17°29.92'S, 63°39.13'W, 440 m, 24-31.xii.2003, FIT, S. & J. Peck. BRAZIL: 1: Goias: Mineiro (BMNH); 1: Mato Grosso do Sul: cerradao fragment nr. Selviria, 20°20'10"S, 51°24'36"W, 1.5 m, 11.ii.2011, FIT, C. Flechtmann, 1: 11.xii.2010, FIT, C. Flechtmann, 2: 16.x.2010, FIT, C. Flechtmann, 1: 23.x.2010, FIT, C. Flechtmann, 1: 23.x.2011, FIT, C. Flechtmann, 2: 28.i.2011, FIT, ground level, C. Flechtmann, 1: 30.xii.2010, FIT, C. Flechtmann, 1: 31.xii.2010, FIT, C. Flechtmann, 3: 4.xii.2011, FIT, C. Flechtmann, 1: 7.i.2011, FIT, C. Flechtmann (UNESP, MSCC, AKTC); 1: Santa Catarina: Nova Teutonia, xi.1938, F. Plaumann (NHRS). FRENCH GUIANA: 1:Montagne des Chevaux, 4°43'N, 52°24'W, 11.vii.2009, FIT, SEAG (CHND). GUYANA:1: Region 8:Iwokrama Field Stn., Turtle Mt. summit, 4°43'57"N, 58°44'1"W, 290 m, 30.v-1.vi.2001, FIT, R. Brooks & Z. Falin (SEMC). PERU:1: Madre de Dios: Res. Tambopata, 30 km (air) SW Pto. Maldonado, 12°50'S, 69°20'W, 290 m, 25.ii.1984, canopy fogging, T. Erwin (USNM), 1: 4.v.1984, canopy fogging, T. Erwin (USNM), 1: 9.xi.1983, canopy fogging, T. Erwin (USNM); 1: San Martín: Almiranto, 1900 m, 12.xii.1936, subtrop. forest, F. Woytkowski (CHSM).

Diagnostic description.

Length: 1.4-1.7mm, width: 1.1-1.2mm; body elongate oval, weakly depressed, glabrous; color rufopiceous, shining, rarely with slight metallic blue tinge, particularly on elytra; head with frons flat, ground punctation fine, sparse, secondary punctures moderately coarser, sparsely interspersed on most of frons, frontal stria barely impressed at upper edge of eye, supraorbital stria present at middle, detached from sides of frontal stria; antennal scape short, club approximately circular; epistoma faintly emarginate apically; labrum about 4 ×wider than long, apical margin shallowly emarginate; mandibles short, each with acute basal tooth; pronotum with sides slightly convergent in basal two-thirds, rounded to apex, lateral marginal stria continuous with complete anterior marginal stria, lateral submarginal stria nearly complete, pronotal disk weakly depressed in anterolateral corners, ground punctation fine, very sparse, with slightly coarser secondary punctures interspersed laterally, slightly larger toward prescutellar area, with median impunctate area about head-width; elytra with two epipleural striae, outer subhumeral stria absent, fine fragment of inner subhumeral stria present at base, dorsal striae 1-4 complete to base, the inner striae strongly abbreviated from apex, base of 4th stria arched mediad to near scutellum, 5th stria strongly abbreviated from apex, slightly abbreviated basally, sutural stria more strongly abbreviated, present only in middle one-third, stria broadened anterad, elytral disk with scattered secondary punctures in apical one-third, extending further anterad toward middle; prosternal keel weakly convex, shallowly emarginate at base, carinal striae converging slightly at middle; prosternal lobe about two-thirds keel length, apical margin rounded, with marginal stria present only at middle; mesoventrite produced at middle, with complete marginal stria; mesometaventral stria arched weakly forward, continuous laterally with inner lateral metaventral stria, which extends posterad toward inner corner of metacoxa, curving mediad slightly at apex, outer lateral metaventral stria present in basal half to nearly complete, subparallel to inner; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with complete inner lateral stria and abbreviated outer stria, with deep secondary punctures rather densely impressed on middle portion of disk, ventrites 2-5 with fine punctures at sides, ventrites 2-3 becoming nearly impunctate at middle, ventrites 4-5 densely but finely punctate across entire width; protibia tridentate, the outer margin serrulate between denticles; mesotibia with two very weak marginal spines; outer metatibial margin smooth; propygidium lacking basal stria, with fine ground punctation and coarser, ocellate secondary punctures uniformly separated by slightly less than their diameters, propygidial gland openings distinct, narrowly elongate, the immediately surrounding disk impunctate; pygidium with sparse ground punctation becoming slightly denser apically, with small secondary punctures denser toward base. Male genitalia (Figs 42 O–Q): T8 with basal emargination rather narrow, deep, ventrolateral apodemes with inner apices separated by about two-thirds T8 width, projecting beneath to about ventral midpoint, obsolete apically, apical margin narrowly emarginate; S8 with halves fused along midline, basal emargination deeply sinuate, basal apodemes bluntly rounded, sides narrowed toward apex, weakly expanded near apex, apices narrowly, obliquely truncate, with a few apical setae, apical emargination broad, arcuate; T9 with short, broadly rounded basal apodemes, halves separated dorsally, ventrolateral apodemes tapering, narrowly rounded, nearly meeting beneath, apices of T9 narrowly rounded, with single subapical seta on each side; T10 weakly sclerotized, with shallow apical emargination; S9 with long, narrow, keeled stem, head abruptly widened, sides subparallel to apex, apices acute, apical emargination broad, shallow, sinuate; tegmen with sides subparallel in about basal two-thirds, narrowed to apex, apices narrowly rounded, tegmen weakly curved in lateral aspect, more strongly curved toward apex; median lobe about one-fourth tegmen length, with apical denticulate plates; basal piece about one-fourth tegmen length.

Remarks.

Baconia punctiventer can be generally distinguished by its coarser frontal punctures (Fig. 43A), pronotal punctures enlarged slightly toward the scutellum, the complete, uninterrupted marginal mesoventral stria, the rather deep punctures of abdominal ventrite 1, and by the curving mediad of the apex of the inner lateral metaventral stria. Many individuals exhibit a very faint metallic blue tinge, but this is not consistent even within localities. Due to considerable variation in several external characters, and the existence of several very similar species, we limit the type series to a subset of specimens from Amazonian Ecuador. Even among Ecuadorian specimens two more or less discrete size classes of individuals are represented, which otherwise exhibit no differences that we can see (including in male genitalia). We conservatively exclude a number of smaller specimens from the type series as well, on the chance that these might represent a cryptic sibling species.

Etymology.

This species’ name refers to the rather distinctive punctures of the 1st abdominal ventrite.