Ostomopsis solomon, Jałoszyński & Ślipiński, 2021

Jałoszyński, Paweł & Ślipiński, Adam, 2021, Revision of the subfamily Ostomopsinae (Coleoptera: Cerylonidae), Zootaxa 4985 (4), pp. 459-481 : 476-478

Ostomopsis solomon sp. n.

( Figs 32–33 )

Type material examined. Holotype ( Solomon Islands): ♀, “ Holotype ” / SOLOMON IS: / Pres. / P.K.M. Greenslade. / B.M.1966-477”, “ 2/8 1966 / 13294 / P. GREENSLADE”, “SOLOMON IS. / New Georgia / {date indecipherable} ( BMNH). Paratype: ♀, disarticulated specimen on separate card under holotype, with “ Paratypus ” label beneath ( BMNH) .

Diagnosis. Body uniformly light brown; elytra elongate, with EL/EW 1.3 and sides parallel in anterior half; eyes large; sides of pronotum with conspicuously long, sparse setae; median area on pronotum and median area on mesoventrite punctate; punctures on sides of elytra in anterior half much larger than those on median region of pronotum; prosternal process with strongly concave sides and weakly bisinuate distal margin; mesoventral process slightly less than twice as broad as prosternal process; scutellar shield over twice as broad as long; antennomere 3 about twice as long as broad, 4–5 each strongly transverse.

Description. Body ( Figs 32–33 ) elongate oval, strongly flattened; BL 1.01 mm, BL/EW 2.03; pigmentation uniformly light brown.

Head ( Figs 32–33 ) subtrapezoidal, HL 0.11 mm, HW 0.28 mm; vertex and frons weakly convex; eyes large and strongly convex, coarsely faceted. Vertex and frons densely covered with shallow punctures with diffuse margins and of unequal diameters and slightly unevenly distributed, among very fine punctures there are several nearly twice as wide; distances between punctures on median area equal to 1–2 diameters of punctures; punctures on clypeus distinct but very fine. Setae long and dense, erect.

Antenna ( Figs 32–33 ) about as long as pronotum, AnL 0.23 mm; scape weakly elongate, pedicel about twice as long as broad, antennomere 3 strongly elongate, about twice as long as broad, 4–9 each strongly transverse, club indistinctly elongate and indistinctly subdivided by superficial constriction into equally long, fused antennomeres 10 and 11.

Pronotum ( Fig. 32 ) broadest near posterior third, 1.6 × as broad as head; PL 0.25 mm, PW 0.44 mm, PL/ PW 0.57; anterior margin evenly, weakly rounded; anterior corners blunt and distinctly projecting anterad; lateral margins broadly rounded and sparsely crenulate; posterior corners strongly obtuse-angled but with very tips acute; posterior margin indistinctly bisinuate. Relatively broad area along each lateral margin distinctly flattened and largely impunctate, with distinct submarginal line; remaining surface of pronotum covered with circular, variable in diameter and depth, nearly evenly distributed punctures, most of them with sharply marked margins; largest punctures are distributed along lateral portions of pronotal base; small punctures are distributed on median area and separated by spaces subequal to their diameters. Setae on convex area of disc similar to those on head, dense and erect; those on lateral pronotal margins over twice as long as flattened area along each side.

Ventral surface of prothorax ( Fig. 33 ) with prosternal process about as long as wide, with sides strongly concave, strongly broadening posterad, posterior corners blunt but strongly projecting laterad, distal margin bisinuate; entire prosternum covered with circular and oval alveolate punctures much larger than those on pronotum and unevenly distributed; those along anterior prosternal margin dense, separated by spaces clearly narrower than their diameters, those on median region separated by spaces subequal to their diameters; hypomera punctate only in inner halves, with punctures similar to those on prosternum but becoming obsolete toward sides, outer regions of hypomera impunctate and indistinctly microreticulate. Setae on prosternum sparse, short and nearly recumbent, present mostly on anterior half; setae on hypomera similarly long; anterior prosternal margin finely crenulate and with dense row of short setae directed anterad.

Mesoventrite ( Fig. 33 ) with mesoventral process between mesocoxae with sides slightly expanding laterad, slightly less than 1.5 × as broad as prosternal process; median area of mesoventrite behind shallow procoxal rests covered with particularly large circular alveolate punctures, some distinctly larger than those on prosternum, unevenly distributed, separated by spaces 0.5–1.5 × as wide as their diameters, punctures reducing in diameter toward sides, those between mesocoxae separated by spaces narrower than their diameters.

Metaventrite ( Fig. 33 ) strongly transverse, indistinctly longer than mesoventrite; small median area impunctate, with distinct short discrimen in posterior half; sides with variously large circular alveolate punctures, largest and densest behind each mesocoxa, where punctures nearly touch one another. Posterior metaventral margin between metacoxae slightly concave.

Hind wings long and functional.

Elytra ( Fig. 32 ) together semioval, 2.6 × as long as pronotum and indistinctly broader than pronotum; EL 0.65 mm, EW 0.50 mm, EL/EW 1.30. Sides parallel in slightly more than anterior half, evenly rounded in posterior 1/3; moderately broad area along each lateral margin distinctly flattened; humeri slightly obtuse-angled, humeral calli weakly marked; each elytron with eight longitudinal rows of large, circular punctures, at least some of those on anterior half with sharp margins, clearly larger than pronotal punctures, punctures reducing in diameter toward apices; remaining cuticle virtually impunctate; setae similar to those on pronotum. Epipleura ( Fig. 33 ) near middle length indistinctly narrower than width of metafemur, each with distinct undulate ridge along mesal margin.

Mesoscutellar shield ( Fig. 32 ) subtrapezoidal, distinctly over twice as broad as long, with sides slightly concave in front of broadest site, lateral corners rounded, posterior margin distinctly angulate.

Abdominal ventrites ( Fig. 33 ) together indistinctly longer than meso- and metaventrite combined; ventrite 1 nearly as long as 2–4 together, with lateral groups of circular alveolate punctures smaller than those on sides of metaventrite and separated by spaces 0.5–2 × as wide as their diameters, median and posterior regions impunctate; ventrite 2 with transverse ridge with subtriangular posterior projections, ventrites 2–5 with fine, inconspicuous punctures.

Etymology. After the Solomon Islands (noun in apposition).

Distribution. Solomon Islands.

Remarks. Ostomopsis solomon is most similar to O. neotropicalis and O. solitaria ; see Remarks for O. neotropicalis .

Figures

FIGURES 32–33. Ostomopsis solomon sp. n. Dorsal (32) and ventral (33).