Euparius marmoreus (Olivier)

Janicki, Julia & Young, Daniel K., 2017, Nemonychidae and Anthribidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2017 (579), pp. 1-36 : 13

Euparius marmoreus (Olivier)

(Fig. 15–16)

Macrocephalus marmoreus Olivier 1795: 12 .

Euparius marmoreus (Olivier) ; Blatchley and Leng 1916: 37.

Description. Length (head excluded) 5.5–7.0 mm. Body elongate. Integument dark reddish-brown. Vestiture consisting of abundant setae, those on frons and rostrum light brown or white with a few light brown setae upper medially; pronotal and elytral setae an intermix of light brown, dark brown and white, pronotal disc usually with two dark brown spots basolaterally and one light brown patch basally; elytral disc with one large white patch anteriorly; interstriae with numerous patches. Rostrum prolonged, thick, thickness 0.3X rostral width. Frons convex, with prominent but weakly elevated median carina extending from epistomal margin to around middle of eyes. Eyes round, prominent. Antennae 11-segmented, segments 3–8 similar, filiform, distal three segments forming a conspicuous club. Pronotal width 1.1–1.2X long, widest basally; sides converging apically, broadly emarginate basally; transverse carina basal, acute, lateral carina acute, joining transverse carina at about an 80° angle; disc convex, with medial and basal impressions; surface strongly punctate-reticulate, usually obscured by vestiture. Elytral length 1.6–1.7X width, broadly rounded apically; disc weakly impressed along suture and more distinctly impressed over declivity; striae with shallow, moderate to large punctures. Pygidium vertical, broadly rounded apically.

Diagnosis. Euparius marmoreus can be distinguished from E. paganus by the presence of a single broad, median, pale ring on each mesothoracic tibia, pronotal hind angles at slightly less than a right angle, sinuate base of the lateral carina, and by the larger size (most commonly around 6.0 mm).

Natural history. This species is generally associated with fungi and dead oaks ( Quercus spp. ) ( Anderson 1992). Specifically, it is associated with polypore fungi in the following genera: Trametes , Megasporoporia , Trichaptum , Phlebia , Panis, Pereniporia ( Valentine 1998) . Specific species include Megaspoporia setulosa , Trichaptum biforme , Trichaotum abietinus , Trichaptum sector , Phlebia hydnoides , Panis rudis, Pereniporia medullapanis, Trametes hirsutus , and Trametes versicolor ( Valentine 1998; Bloem et al. 2002). In Wisconsin, it has been found in polypore fungi on fallen dead logs of big toothed aspen ( Populus grandidentata ), on the underside of Trametes hirsutes , and in Stereum -infested dead oak branches.

Phenology. In Wisconsin, adults have been collected from March – November, with a peak May – July.

Collecting methods. The 113 Wisconsin specimens examined during this study from 23 counties represent a NEW STATE RECORD. This species is most often collected by beating dead logs or branches that are infested by fungi and by examining fungi on dead logs. It has also been collected from flight intercept, Malaise, and Lindgren funnel traps, Berlese leaf litter samples, by rearing larvae from fungusinfested dead branches, as well as light traps or simply hand-collected at light. It was recovered from an unbaited Lindgren funnel trap in an oak pine forest, a Malaise trap in old Populus deadfall, and beaten from Stereum -infested dead oak branches.