Apetasimus conditus Ewing

Ewing, Curtis, 2006, Revision of the endemic Hawaiian sap beetle genus Apetasimus Sharp 1908 (Coleoptera: Nitidulidae), Zootaxa 1385, pp. 1-30 : 21-22

Apetasimus conditus Ewing sp. nov.

Diagnosis

Distinguishable from other involucer -group members by the combination of prosternal process strongly recurved dorsad behind coxae, eyes large ( Fig. 2 L) and reduced tarsal lobes ( Fig.4 M), from brachypterous Eupetinus by reduced tarsal lobes ( Fig. 4 M), and brachypterous Gonioryctus by the less acute temple.

Description

Size: Length 4.0mm, Width 2.1mm.

Color: Dorsum of head, pronotal disc, small area adjacent to scutellum on elytra, and abdominal tergites orange-red, marginal beads of pronotum and elytra, anterior and posterior margins of pronotum, margin of paratergites, tergites at spiracles, median basal portion of tergites 5 and 6, scutellum and elytra brick red, explanate margins of pronotum and elytra, and paratergites pale yellow.

Head: Transverse, 0.70mm L, 1.0mm W, L/W ratio 0.70. Punctation on vertex coarse, dense, shallow and granular inside, punctures usually contiguous, finer and shallower on frons, punctation obsolete near labrum, surface roughened, intervals narrow, uneven and glabrous on frons, granular on clypeus. Eyes medium, length 0.21mm, facets coarse, 12, medial margins convergent anterad. Temple narrow, subacute, postgena broadly convex ( Fig. 2 L). Antennomeres 1–4 elongate, 5 quadrate, 6–8 transverse.

Prothorax: Pronotum transverse, 1.15mm L, 1.79mm W, L/W ratio 0.64 ( Fig. 4 L). Disc convex, lateral margin upturned posterad, pair of shallow impressions on either side of midline before margin. Lateral edge weakly explanate behind anterior angle to middle, increasingly explanate from middle to widely explanate posterior angle. Lateral margin evenly rounded to subacute posterior angles. Widest behind midpoint, anterior/posterior width ratio 0.65. Anteriorly emarginate, posterior margin shallowly bisinuate. Punctation less coarse and dense than on head, intervals glabrous with fine linear microsculpture. Bead extending from anterior angle to posterior angle, posterior marginal bead widest at midline, thin and indefinite near hind angle. Prosternal process short, strongly recurved dorsad behind coxae, meeting mesosternum at ~60° angle, apex with long fimbria ( Fig. 4 G).

Elytra: 1.55mm L, 1.04mm W, L/W ratio 1.49 ( Fig. 4 K). Surface uneven. Striae shallow, wider than interstices. Striae irregular, interstices glabrous with fine, irregularly arranged punctures. Lateral margin rounded anterad, sinuate for posterior 1/5. Posterior margin shallowly sinuate.

Legs: Protarsi with small lobes, tarsomere 1 with largest, smaller on 2, obsolete on 3 ( Fig. 4 F). Meso- and metatarsal lobes obsolete on 1–3, parallel in dorsal view, ventral setae sparse ( Fig. 4 M).

Abdomen: Female; surface of tergite 5, 6, and pygidium with granular microsculpture, punctation on pygidium coarser. Posterior margin of pygidium broad, truncate, rounded laterally, with shallow medial depression at posterior margin appearing emarginate when viewed from certain angles, fimbria short laterally, longer across midline. Terminal sternite broadly rounded.

Holotype Ψ, labeled: "East Maui, east of Kuhiwa Valley, 09–VI–1999, 2,900 ft. el. D. A. Polhemus and C. P. Ewing colls." (CUIC).

Etymology: (L.) conditus ; hidden, secret.

Distribution: Known from type locality.

Habits: Fogged with pyrethrin from moss covered Cibotium tree fern trunk.

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.