Oligocorynus flavomaculatus ( Mader, 1943 ),

Lopes, Peterson Lásaro, Gasca-Álvarez, Héctor Jaime & Skelley, Paul E., 2020, Redescriptions, new synonymy, new combination and new records of Bacis Dejean, 1836 and Oligocorynus Dejean, 1876 (Coleoptera: Erotylidae: Erotylinae) for Colombia, Zootaxa 4809 (2), pp. 349-362: 355-360

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Oligocorynus flavomaculatus ( Mader, 1943 )

new combination

Oligocorynus flavomaculatus ( Mader, 1943)  , new combination

( Figs. 30–56View FIGURES 30–37View FIGURES 38–45View FIGURES 46–52View FIGURES 53–56)

Phricobacis flavomaculatus Mader 1943: 114  ; Mader 1951: 203, key; Alvarenga 1994: 119, catalog. Holotype: Peru, Chanchamayo (NHMW, not examined).

Redescription. Length 7 mm, thorax/abdomen R=1.4. Body moderately oval, sides subparallel, moderately convex. Head dark orange, antennae with antennomere I orange and antennomeres II to XI black, clypeus dark orange, pronotum orange, mesoventrite, mesanepisterna, mesepimera and metaventrite dark orange, coxae and femora dark orange, tibiae and tarsi black, elytra black with three orange maculae, epipleura black, ventrites dark orange ( Figs. 30–33View FIGURES 30–37).

Head (R=0.7): ocular striae absent, eyes finely faceted, interocular distance ~5/8 of head width, sub-ocular pore evident, post-mandibular lobes conspicuous with a setal tuft ( Fig. 34View FIGURES 30–37). Stridulatory organs at base of head absent in both sexes. Antennae (R=12.1): club with three flattened antennomeres, antennomere VIII and XI elongate, antennomeres more pubescent towards club ( Fig. 35View FIGURES 30–37). Clypeus (R=0.5): apex emarginate, lateral margins curved, central region elevated, surface with fine punctures ( Fig. 34View FIGURES 30–37). Labrum (R=0.5): sub-elliptical, with semicircular anterior elevation, distal margin truncate, anterior angles rounded, absence of membranous cover at proximal half ( Fig. 36View FIGURES 30–37). Epipharynx with setae in median region and at anterior margin, median region covered with microtrichiae, tormae with anterior projection reaching the basal quarter of labrum, posterior projection of tormae almost as long as the anterior projection ( Fig. 37View FIGURES 30–37, arrow). Mandibles slightly asymmetrical, with three incisors, distal incisors narrower and sclerotized, membranous lobe covered with microtrichiae on molar region, one carina at dorsal region, ventral cavity with internal incisor margin curved, sinuate in left mandible, left mandible with proximal incisor smaller and attached to the middle incisor as a lobe ( Figs. 38–41View FIGURES 38–45). Maxillae (R=3.3): lacinia with two apical curved teeth, with long setae denser distally, basal palpomere elongate, palpomeres II–III as wide as long, palpomere IV very long, securiform, galea (R=1.3) lobed, slightly projected, with moderately long setae denser distally ( Figs. 42–43View FIGURES 38–45). Hypopharynx with two arms extending to anterior region of mentum ( Fig. 44View FIGURES 38–45, arrow). Labium (R=1.6): ligula long (~3/4 width of mentum), fused at middle, basal sclerite absent, outer angles with moderate projection, setae denser on last palpomeres, basal palpomere with moderately curved base, palpomere III slightly securiform, asymmetrical, inner angle of distal margin slightly narrow, mentum with medial region without definite shape ( Fig. 45View FIGURES 38–45).

Thorax: pronotum (R=0.4) flattened, lateral region of posterior margin without depression, surface with strong punctures, prosternum with moderately long setae, basal margin of prosternum truncate, prosternal lines absent, procoxal lines absent. Scutellar shield (R=0.7) triangular. Metaventrite (R=0.4): mesocoxal lines absent, supracoxal lines conspicuous. Legs: surface of femora with sparse punctures, tibiae with dense setae and slightly expanded distally, metathoracic legs with femora as wide as the prothoracic legs. Elytra (R=2.2): subtriangular, base sinuate, surface with moderate punctures (φ~ 0.1 mm), striae and inter-striae indistinct. Metathoracic wings (R=2.3): with one axillar vein, veins AA 3+4 reaching CuA 3+4, veins MP 3+4 reaching MP 1+2, vein cua1-mp4 complete, vein r4 incomplete, medial spot conspicuous ( Fig. 46View FIGURES 46–52).

Abdomen: surface fine and sparse, with few short setae, ventrite 1 with anterior elevation. Male genital segments and genitalia: tergite VIII (R=0.4) subtriangular, base curved, setae denser distally ( Fig. 47View FIGURES 46–52), sternite VIII (R=0.3) transverse, distal margin emarginate, setae denser distally ( Fig. 48View FIGURES 46–52), tergite X (R=0.7) U-shaped, apex slightly rounded, setae denser distally ( Fig. 49View FIGURES 46–52), laterotergite IX (R=1.6) elongate, asymmetrical, lateral lobes sub trapezoidal; sternite IX setae denser distally ( Fig. 50View FIGURES 46–52). Aedeagus: tegmen elongate at proximal third, dorsal longitudinal line sclerotized, with dorsal subapical spot, tegmen arm long, with a sclerotized ventral line, lateral lobe width ~1/8 of tegmen length, setae denser distally, distal region of medial lobe with a short and cylindrical projection, internal sac short ( Fig. 51View FIGURES 46–52); head of flagellum falciform, elongate ( Fig. 52View FIGURES 46–52, MAAEIS). Female genital segments and genitalia: tergite VIII (R=0.5) transverse, setae denser distally ( Fig. 53View FIGURES 53–56), sternite VIII (R=0.6) transverse, setae dens- er distally, median strut approximately four times longer than base ( Fig. 54View FIGURES 53–56), tergite IX and sternite IX indistinct, membranous, surface with microtrichiae uniformly distributed. Ovipositor: proctiger lobe long, covering the vulval lobe, subvulval lobe as wide as the basal segments of the gonocoxites, gonocoxites ~1/2 of ovipositor length with apex truncated and angulate at inner apex, gonostyli with dense setae ( Figs. 55–56View FIGURES 53–56, arrow). Spermatheca oval.

Intraspecific variation. The sizes of the elytral maculae are variable. The elytral base can be straight.

Diagnosis. Oligocorynus flavomaculatus  is distinguished from other Oligocorynus  species by its dorsal coloration, having the elytral surface black with three orange spots and the pronotum orange, and clypeus emarginate.

Etymology. The genus name is derived from the Greek oligo, “few, scanty” and coryno, “club, mace”; the specific epithet is derived from the Latin flavus, “yellow” and maculatus, “with spots”, referring to the antennae and the elytral coloration.

Material examined. Colombia—Boyacá : Muzo (5°32’7’’N, 74°10’40’’W), ex-Coll. Alvarenga, M. Alvarenga det. [ Oligocorynus  “sp.n.2”], homeotype, †483 ( MNRJ)GoogleMaps  . Brasil—Acre : Tarauacá (8°7’59’’S, 70°46’0’’W), ex-Coll. M. Viana, ex-Coll. J.E. Barriga Chile, P. Skelley det., ♂, #022163, #077131, †1 ( FSCA)GoogleMaps  . Rondônia : Ouro Preto do Oeste , sítio Deus é Amor (1°42’35’’S, 62°15’0’’W), M.F. Torres col. (26.iii.1985), P. Skelley det. 1995 [ Zonarius  near rugipunctatus], ♂, †83 ( MPEG)GoogleMaps  ; Fazenda Rancho Grande , 62 km SO Ariquemes (10°18’0’’S, 62°37’48’’W), C.W. & L.B. O’Brien col. (16.x.1993), P. Skelley det., ♂, †2 ( FSCA)GoogleMaps  . Peru—P. Skelley det. 1994 [ Zonarius  near rugipunctatus], ♀, †344 ( HNHM)  .

Geographical distribution. Colombia (Boyacá) (new country record), Brazil (Acre, Rondônia), Peru (Chan- chamayo).

Remarks. According to the unpublished thesis of Lopes (2009), Phricobacis flavomaculatus  and other species in the genus Phricobacis  are more related to some species of the genus Oligocorynus  . A phylogenetic analysis of the genus Oligocorynus  should include a study of these species. For now, based on Lopes (2009), we transfer P. flavomaculatus  to Oligocorynus  , becoming Oligocorynus flavomaculatus (Mader)  , new combination.


Museu Nacional/Universidade Federal de Rio de Janeiro


Florida State Collection of Arthropods, The Museum of Entomology


Museu Paraense Emilio Goeldi


Hungarian Natural History Museum (Termeszettudomanyi Muzeum)














Oligocorynus flavomaculatus ( Mader, 1943 )

Lopes, Peterson Lásaro, Gasca-Álvarez, Héctor Jaime & Skelley, Paul E. 2020

Phricobacis flavomaculatus

Alvarenga, M. 1994: 119
Mader, L. 1951: 203
Mader, L. 1943: 114