Apetasimus involucer

Ewing, Curtis, 2006, Revision of the endemic Hawaiian sap beetle genus Apetasimus Sharp 1908 (Coleoptera: Nitidulidae), Zootaxa 1385, pp. 1-30 : 15-16

Apetasimus involucer -group

anterad, distinctly explanate posterad, prosternal process strongly recurved dorsad behind procoxae. Elytral interstices often with dilated areas bearing rows of setae forming tufts ( Fig. 2 E). Lateral margin broadly explanate anterad, tapering posterad and and little explanate near posterior margin ( Figs. 4 A, 4I, 4K). Pterothorax, including elytra, reduced in length. Tarsal lobes least developed in this species group and only Cillaeopeplus approach this level of reduction within endemic Hawaiian Nitidulidae . Oahu and Molokai species have eyes extremely reduced, 6–8 facets along lateral margin, whereas Kauai and East Maui species are more developed, bearing 12–14 facets.

Description

Size: Length 4.0– 4.8mm, Width 2.0– 2.1mm

Color: Pale yellow to orange-red.

Head: Labrum with narrow, shallow emargination, lateral setal brush small. Eyes variable, facets coarse. Temple oblique to rounded and continuous with postgena.

Prothorax: Pronotum narrow anterad, widest posterior to midpoint, rounded laterally with or without a small sinuation before posterior angle, broadly emarginate anteriorly, posterior margin sinuate to bisinuate. Lateral margin widely explanate posterad, narrowly anterad. Prosternal process little expanded apically and strongly recurved dorsad behind coxae, not overlapping mesosternum.

Elytra: Striae shallow, margins wide, explanate.

Metacoxae: Widely separated, ratio 0.21–0.24.

Legs: Tarsal lobes small, tarsomeres 1–2 indistinctly dilated, 3 variable, terminal tarsomere longest, basal tarsomere longer than tarsomeres 2–4 individually.

Figures

FIGURE 2. Apetasimus involucer. A. Aedeagus and sac (dorso-lateral view); B. Male perisac (ventral view); C. Aedeagus (ventral view); D. Aedeagus (lateral view); E. Elytron, setal tufts indicated; F. Female pygidium. G. Female sternite 7. H. Male pygidium. I. Male sternite 7. J. Left protarsi (dorsal view). K. Pronotum, dashed line indicates explanate margin; L. Head. M. Tegmen (ventral view); N. Male segment 8 (ventral view). ae anterior excavation, aed aedeagus, di dorsal incision, fl flagellum, lf lateral fold, lp lip of anterior excavation, ma retractor muscle attachment, mt median triangle, pe posterior excavation, s 8 sternite 8, sd sperm duct, hl head length, sp sclerites-primary, t 8 tergite 8, vi ventral incision, vh ventral hook.

FIGURE 4. Apetasimus abstrusus sp. nov. A. Elytron, dashed line indicates explanate margin; B. Head; C. Prosternum (ventral view); D. Prosternum (lateral view); E. Pronotum, dashed lines indicate explanate margins; F. Left protarsi (dorsal view). Apetasimus ganeademus sp. nov. G. Prosternum (lateral view); H. Pronotum; I. Left elytron, dashed line indicates boundary of explanate margin; J. Female pygidium. Apetasimus conditus sp. nov. K. Elytron, dashed line delimits explanate margin; L. Pronotum, dashed lines delimit explanate margins; M. Left mesotarsi (dorsal view). c clypeus, mai median apical impression, el elytral length, v vertex.