Baconia riehli (Marseul, 1862)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297: 55-57

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scientific name

Baconia riehli (Marseul, 1862)

comb. n.

Baconia riehli (Marseul, 1862)   comb. n. Figs 11 G–H 13Map 3

Phelister riehli   Marseul, 1862: 697.

Type locality.

CUBA [exact locality uncertain].

Type material.

Lectotype, sex undetermined, here designated (MNHN): "Phelister riehli M. Cuba [rest illegible]" / "[green heart-shaped label]" / "Museum Paris Coll. De Marseul 2842-90" / “Type” / "LECTOTYPE Phelister riehli Marseul, 1862, M.S.Caterino & A.K.Tishechkin des. 2010". This species was described from an unspecified number of specimens, and the lectotype designation fixes primary type status on the only known specimen.

Other material.

CUBA: 1:Upper Ovando R. eastern Oriente, 1000-2000 ft, 17-20.vii.1936, P. Darlington (FMNH); 1: country record only (ZMHB). DOMINICAN REPUBLIC: 1: La Altagracia: P. N. del Este, Boca de Yuma, 18°21.508'N, 68°36.956'W, 20 m, 19.vii.2004, S. Lingafelter (AKTC).

Diagnostic description.

Length: 2.2-2.3mm, width: 1.7-2.0mm; body elongate oval, almost parallel-sided, moderately depressed, glabrous; most of body, including venter, metallic blue to greenish-blue, elytra moderately to strongly violet; frons elevated over antennal bases, depressed at middle, ground punctation rather conspicuous, with small secondary punctures on epistoma, slightly larger punctures in frontal depression, frontal stria present along inner margin of eye, fragmented to absent across front, supraorbital stria vaguely represented by series of punctures; antennal scape short, club slightly asymmetrically oblong; epistoma slightly convex along apical margin, truncate; labrum about 3 ×wider than long, weakly emarginate to bisinuate along apical margin; both mandibles with acute basal tooth; pronotal sides weakly convergent in basal half, arcuate to apex, marginal stria complete along lateral and anterior margins, lateral submarginal stria absent, ground punctation of pronotal disk rather conspicuous, interspersed with small secondary punctures nearly throughout, only lacking in posteromedial region; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria present as basal and frequently median fragments, dorsal striae 1-3 complete, 4th stria variably abbreviated from base, 5th and sutural striae absent, elytral disk with few coarse punctures in apical fourth; prosternum narrowed between procoxae, weakly convex, keel truncate to very weakly emarginate at base, carinal striae complete, divergent anterad and posterad, separate throughout; prosternal lobe about two-thirds keel length, apical margin subtruncate, marginal stria obsolete; mesoventrite weakly emarginate, slightly sinuate at middle, with a complete stria slightly removed from margin which is probably the mesometaventral stria, strongly displaced anterad; lateral metaventral stria originating freely near mesocoxa, curving posterolaterad toward middle of metacoxa, slightly abbreviated apically, outer lateral metaventral stria absent, metaventral disk impunctate at middle; abdominal ventrite 1 with single, complete lateral stria, middle portion of disk with few small punctures along apical margin; protibia 4-5 dentate, the basal one or two denticles weak, outer margin serrulate between teeth; meso- and metatibiae rather elongate, narrow, mesotibia with two weak marginal spines; outer metatibial margin smooth; propygidium with complete transverse basal stria, discal punctures rather small, ocellate, separated more or less uniformly by about their diameters; propygidial gland openings conspicuous behind ends of transverse basal stria, about one-fourth from each lateral margin; pygidium with sparse ground punctation interspersed with small secondary punctures throughout, these slightly larger and denser toward base. Male genitalia (Fig. 13): T8 slightly longer than broad, sides subparallel to weakly rounded, basal emargination broad, shallow, apical emargination very shallow, ventrolateral apodemes separated by about one-half maximum T8 width, extending about one-third distad beneath, strongly narrowed in apical half; S8 about as long as T8, divided, inner margins approximate along basal one-fourth, strongly divergent apically, outer margins subparallel, convergent to apex, apical guides well developed in apical apical two-thirds, elongate, narrowly rounded apically, lacking apical setae; T9 with basal apodemes thin, almost two-thirds total length, T9 apices narrowly subacute, glabrous, weakly opposing, ventrolateral apodemes weakly projecting beneath; S9 stem thin near basal one-third, weakly bulbous at base, head wide, curved to horn-like apicolateral points, desclerotized along midline, with narrow apicomedial division; tegmen with sides subparallel in basal half, weakly widened to near apex, slightly bulbous apically, dorsobasal edge weakly arcuate, tegmen in lateral aspect more or less straight; median lobe about one-third tegmen length; basal piece about one-fourth tegmen length.


At present, Baconia riehli   is one of only two species in the genus known to occur in the West Indies. The other is Baconia pulchella   , in the Baconia aeneomicans   group. It is interesting to note that both of these exhibit more distinctly violet coloration than do nearly any mainland species, although they are not closely related. The two are easily distinguished by the larger, more broadly body form of Baconia riehli   (Fig. 11G vs. 38C). From mainland species in the Baconia godmani   group, this species is unique in lacking a marginal stria on the prosternal lobe.