Brasilaccoderus Pollock, 2006, n. gen.
Creators: name: Pollock, Darren A.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Mycteridae
Brasilaccoderus

description: Brasilaccoderus n. gen.
(Figs. 1–8)
Laccoderus Champion 1916a: 106 (in part)— Champion 1916b: 225; Blackwelder 1945: 493; Elgueta & Arriagada 1989: 36.
Type species— Laccoderus scaber Champion, by present designation.
Diagnosis— Brasilaccoderus has the following diagnostic features among described world genera of Eurypinae: short antennae with submoniliform, serrated antennomeres; apical maxillary palpomere only slightly securiform; eyes relatively widely separated, with elongate interfacetal setae; male sexual patch on ventrite 2; elytra without dorsally visible apical patch.
Description— Body elongate, slightly ovate and depressed; body 3.2–3.7 times longer than greatest width; TL 5.2–9.9 mm. Head (Figs. 3–4) relatively short, not or only very slightly narrowed behind eyes; frontoclypeal suture indicated laterally and medially by arcuate depression (especially distinct in B. scaber); frons variously depressed medially, lateral margins elevated; anterior margin of clypeus with unsclerotized strip of cuticle; labrum transverse, outer surface distinctly convex; antennal insertions not concealed dorsally; antennae (Fig. 5) short, extended posteriorly only to posterior margin of pronotum; scape elongate, widened distally; antennomeres 2–10 short, submoniliform and serrated; distal sensilla present from antennomere 3, especially dense on distal antennomeres; antennomere 11 elongate, constricted distal of midlength; eyes large, hemispherical (Figs. 3–4), relatively widely separated; facets moderately fine, with elongate, erect intrafacetal setae; eyes only slightly more convex in males than females. Mandibles short, stout, symmetrical; apices blunt, bidentate; terebral teeth absent; inner margin incised abruptly, anterior of mola, deeper ventrally; mola relatively large, similar on both mandibles, surface with transverse shearing surfaces, without apparent microstructure; ventral groove/microtrichia absent; prostheca long, digitiform, extended distally from near anterior edge of mola. Maxilla with elongate palpi, apical palpomere slightly securiform; lacinia very slender, blunt distally, with dense brush of setae; galea broad, with apex produced inwardly, in contact with apex of lacinia; galea also with dense apical setal brush, especially on produced lobe. Labium with mentum transverse; ligula broad, subquadrate, extended significantly anterad base of palps; labial palpi short, distal palpomere blunt apically; gula relatively short, sutures convergent anteriorly, surface indistinctly convex. Prothorax with pronotum subquadrate, slightly wider than long (GPW/PL 1.1–1.3); lateral margins subparallel (B. scaber — Fig. 1) or convergent anteriorly (B. plaumanni — Fig. 2), without lateral carina; disc with medial depressions, variously developed (most distinct in B. scaber); posterior pits present, openings incised, foveate, joined transversely by narrow arcuate groove; punctation more or less uniform, punctures shallowly (B. plaumanni) or deeply (B. scaber) umbilicate; setae adpressed and erect, the former directed in various directions; prosternal process short, knifelike, extended half the length of procoxae; internal portion of process indistinct; coxal cavities open externally and internally; protrochantin hidden; Mesothorax with mesoventrite triangular, lateral margins straight; mesepisterna very narrowly separated anteriorly, with distinct elliptical setose excavations anterolaterally; mesocoxal cavities partly closed by mesepimeron, with hidden trochantins; mesosternal process elongate, slender, touching short metasternal process. Metasternum convex, with distinct median line posteriorly for greater than half its length. Metendosternite with wide stalk; laminae large, lobate laterally; dorsal margin of body distinctly arcuate from midline to bases of elongate lateral arms; insertion points of anterior tendons not seen on the one dissected specimen. Elytra elongate, 2.2–2.6 times longer than greatest combined width, moderately convex; epipleuron distinct, visible to at least ventrite 4; elytral disc relatively smooth, punctate, with some small impunctate areas (especially in B. scaber); vestiture dimorphic: large primary elytral punctures with adpressed setae; smaller secondary punctures with erect setae; apical patch present, although invisible dorsally. Legs (Figs. 7–8) slender, all similar in size and shape; femora broad, tibiae relatively straight and slender; tibial spurs short, similar in size and shape; tarsal formula 5-5- 4 in both sexes, penultimate tarsomere short dorsally but with large subquadrate lobe ventrally; tarsomeres 2 and (especially) 3 triangular; last tarsomere elongate, distally widened slightly; all tarsomeres (except lobe on penultimate, and last) with long setae; tarsal claws with short, distinct basal tooth. Abdomen with first three ventrites connate; male with sex patch on ventrite 2; patch circular, with dense setae on raised medial area of ventrite. Male genitalia (Fig. 6). Median lobe oriented dorsal to tegmen; apicale and basale subequal in length along lateral margins; basale deeply emarginate basally; parameres stout, curved inwardly at apices, with sparse apical setae; median lobe significantly longer than tegmen, without wide basolateral flanges, sides parallel basally, gradually narrowed to blunt apex; median lobe mostly membranous dorsally, with short sclerite along inner ventral surface; endophallus absent. Female genitalia (based on B. plaumanni, only). Ovipositor elongate, flexible, mostly unsclerotized; coxites 4-segmented, with very sparse, mostly short setae; last coxite very short, distinctly sclerotized; styli short, widened distally, with several long setae; valviferal and coxital baculi distinct; spiculum gastrale distinct, relatively wide; bursa copulatrix large, widened distally, external surface covered with longitudinal spiculae; side of bursa with short accessory branch; distinct spermatheca absent from single dissection performed.
Derivation of generic name— This name is a combination of the geographic placename Brasil, and Laccoderus, in which genus Champion originally placed B. scaber.
Geographical distribution— The examined specimens of Brasilaccoderus are are all from southeastern Brazil (São Paulo, Paraná, and Santa Catarina states).
description: Published as part of Pollock, Darren A., 2006, Brasilaccoderus, a new genus of Eurypinae (Coleoptera: Mycteridae) from Brazil, pp. 41-48 in Zootaxa 1368 on pages 42-44, DOI: 10.5281/zenodo.174840