Apetasimus pleomelarrosus

Ewing, Curtis, 2006, Revision of the endemic Hawaiian sap beetle genus Apetasimus Sharp 1908 (Coleoptera: Nitidulidae), Zootaxa 1385, pp. 1-30 : 22

Apetasimus pleomelarrosus -group

Diagnosis

The two pleomelarrosus -group species are characterized by an elytral depression on the lateral face posterior to humeral angle ( Figs. 5 B, 6J). Overall form more elongate than involucer- or guttatus -groups, eyes and tarsal lobes developed. Labrum bearing wide lateral setal brush. Pronotum with disc depressed to slightly convex, prosternal process weakly recurved dorsad behind coxae and expanded apically. Lateral elytral margin narrow, interstices regular to irregular, never with dilated and raised areas bearing setal tufts. The two pleomelarrosus -group species are superficially dissimilar; one is large and dark, the other small and pale.

Description

Color: Orange-red, dark brick red, to black.

Length 4.7mm – 8.3mm, Width 1.7–4.5mm.

Head: Labrum with wide emargination, wide lateral setal brush ( Figs. 5 A, 6F). Eyes not reduced, facets fine, 14–27. Temple definite, angle sharp to rounded, postgenae straight to concave.

Thorax: Pronotum narrowed posterad, widest at midpoint ( Fig. 5 C) or anterad ( Fig. 6 C), laterally rounded with or without small sinuation anterad posterior angle, anteriorly shallowly to definitely emarginate, posterior margin sinuate to bisinuate, lateral margin explanate or not. Prosternal process expanded apically and indistinctly ( Fig. 5 D) to distinctly recurved dorsad behind coxae ( Fig. 6 H), overlapping mesosternum. Elytral striae shallow, margin weakly explanate, lateral excavation present behind humeri ( Figs. 5 B, 6J). Metacoxae less widely separated than involucer -group species, L/W ratio 0.14–0.16. Tarsal lobes 1–3 dilated ( Figs. 5 P, 6I).

Figures

FIGURE 5. Apetasimus pleomelarrosus sp. nov. A. Head, labral macrosetae broken; B. Elytron, dashed line delimits explanate margin at lateral excavation; C. Pronotum; D. Prosternum (lateral view); E. Prosternal process (ventral view); F. Spermatheca (torn at base); G. Gonocoxae (ventral view); H. Aedeagus (ventral view), showing internal structure; I. Male tergite 8 (ventral view), bottom half showing ventral setae, top half showing dorsal setae; J. Tegmen (ventral view); K. Male sternite 8 (ventral view); L. Female pygidium; M. Female sternite 7; N. Male pygidium; O. Male sternite 7; P. Left mesotarsi. ad apical depression, ae anterior excavation, ag accessory gland, br basal ring, gx 1 gonocoxite 1, gx 2 gonocoxite 2, le lateral excavation, lg lateral groove, lp lip of anterior excavation, mt median triangle, pe posterior excavation, ps prestylar setae, spd spermathecal duct, st stylus, sts stylar setae.

FIGURE 6. Apetasimus debbiae sp. nov. A. Female genitalia (ventral view); B. Gonocoxae (ventral view); C. Pronotum; D. Female sternite 7; E. Female pygidium; F. Head (dorsal view); G. Prosternal process (ventral view); H. Prosternum (lateral view); I. Left protarsi (dorsal view); J. Elytron, dashed line indicates explanate margin extending from lateral excavation. ad apical depression, ag accessory gland, bc bursa copulatrix, co common oviduct, gx 1 gonocoxite 1, gx 2 gonocoxite 2, hg hindgut, le lateral excavation, lg lateral groove, ps prestylar setae, spf spicule field (dashed line indicates dorsal limits of field), spd spermathecal duct, spt spermatheca, st stylus, sts stylar setae, v vagina.