Apetasimus ganeademus Ewing

Ewing, Curtis, 2006, Revision of the endemic Hawaiian sap beetle genus Apetasimus Sharp 1908 (Coleoptera: Nitidulidae), Zootaxa 1385, pp. 1-30 : 19-20

Apetasimus ganeademus Ewing sp. nov.

Diagnosis

Separated from brachypterous Eupetinus and Gonioryctus by reduced eyes ( Fig. 4 B) and tarsal lobes ( Figs. 4 F, 4M), temple rounded at angle ( Fig. 4 B), and pronotum convex at center of disk. It closely resembles A. abstrusus from Waianae Mountains, Oahu, but distinguished by pronotal punctation deeply impressed, each puncture clearly defined and intervals with fine linear microsculpture, and prosternal process meeting postcoxal sclerites at 60° angle vs. 45° angle for A. abstrusus .

Description

Size: Length 4.7mm, Width 2.1mm.

Color: Frons, elytra and margins of ventral sclerites dark brick red, remainder orangered.

Head: transverse, 0.70mm L, 0.96mm W, L/W ratio 0.73. Punctation coarse, dense, adjacent punctures often contiguous, definite on vertex, becoming shallower and more dense from posterior to anterior on clypeus, interval microsculpture linear, sparse on front, dense on clypeus. Eye reduced, length 0.16mm, facets 7–8, medial margin convergent. Temple indistinct, contiguous with postgena, forming smooth curve to neck ( Fig. 4 B). Antennomeres 1–4 elongate, 5 quadrate, 6–8 transverse.

Prothorax: Pronotum transverse, 1.13mm L, 1.73mm W, L/W ratio 0.65 ( Fig. 4 H). Disc convex, pair of shallow impressions on either side of midline before hind margin. Lateral edge weakly explanate behind anterior angle to middle, evenly increased to widely explanate at posterior angle, margin upturned, most strongly near midpoint. Lateral margin evenly curved to obtuse, rounded posterior angle, widest just behind midpoint, anterior/ posterior width ratio 0.62. Distinctly emarginate anteriorly, posterior margin shallowly bisinuate. Bead extended from anterior angle to posterior angle laterally, definite at midline of posterior margin, narrowed laterally, obsolete at posterior angle. Punctation coarse, definite, dense, many punctures contiguous, intervals subglabrous, microsculpture of fine lines. Prosternal process short, strongly recurved dorsad behind coxae, meeting mesosternum at ~60° angle, apex with long fimbria ( Fig. 4 G).

Elytra: 1.73mm L, 1.13mm W, L/W ratio 1.53 ( Fig. 4 I). Surface uneven. Striae 1–7 shallow, obsolete laterally, striae wider than interstices. Strial punctures in irregular rows, interstices glabrous with fine punctures, irregularly arranged. Lateral margin smoothly curved for anterior 3/4, posterior 1/4 straight and slightly angled inwards. Widely explanate at humeri, little narrowed for anterior 1/2, narrowing evenly to posterior angle. Posterior margin shallowly bisinuate.

Legs: Protarsi with lobes on tarsomere 3 extended 1/2 length of tarsomere 4, meso- and metatarsi with obsolete lobes.

Abdomen: Female; surface of tergites 5, 6, and pygidium with granular microsculpture, punctation on pygidium coarser. Apex of pygidium narrow, elongate, tip subtruncate, rounded laterally, with shallow medial depression at posterior margin creating appearance of emargination when viewed from certain angles, fimbria short laterally, increased in length toward midline, obsolete on midline ( Fig. 4 J). Apex of sternite 7 rounded.

Holotype Ψ, labeled: "Molokai, Wailau Valley rim at Wailau Tr., 17–VI–1999, lot 0 1, 895 m. el., 21º 06’ 27” N, 156º 48’ 58” W. D. A. Polhemus and C. P. Ewing colls." (CUIC).

Etymology: (L.) ganea; eating-house. (L.) demas; body.

Distribution: Known from type locality.

Habits: Fogged with pyrethrin from horizontal, moss covered Metrosideros polymorpha trunk.

Figures

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.