Baeocera onerosa, Löbl, 2021

Löbl, Ivan, 2021, Contribution to the knowledge of the Scaphisomatini (Coleoptera: Staphylinidae: Scaphidiinae) of Mindanao, Philippines, Biodiversity, Biogeography and Nature Conservation in WALLACEA and NEW GUINEA, Riga: The Entomological Society of Latvia, pp. 265-272 : 268

Baeocera onerosa sp. nov. (

Figs 8–10 )

Holotype ♂ MHNG: Mindanao , Araibo, Pantukan , Compostela Valley, 900 m, Candalaga / Mts., 7°16’35.3’’N, 126°10’12.8’’E, 4.5.2019 Shavrin A. V. leg .

Paratypes 8♂ & 6♀ PCAS & MHNG: same data as in holotype .

Derivatio nominis: The species epithet is a Latin adjective meaning difficult.

Description: Length 1.08–1.18 mm, width 0.71– 0.81 mm. Frons and body blackish, with apical abdominal segments light, ochraceous to yellowish. Femora and tibiae dark reddish-brown, tarsi and antennae light, nearly yellowish. Body strongly convex dorsally. Eyes in dorsal view as large as half of interval between them. Length/width rations of antennomeres as: III 28 /6: IV 21 /6: V 30 /6: VI 28 /6: VII 34 /8: VIII 33 /7: IX 35 /10: X 35 /13: XI 40 /13. Pronotum and elytra not microsculptured, with lateral contours nearly continuously arcuate. Pronotum very finely punctate, with lateral margins rounded, lateral margin carinae concealed or hardly visible in dorsal view. Scutellum concealed. Elytra not overlapping abdominal apex, strongly narrowed apically, lateral margin carinae visible only near bases in dorsal view, sutural striae entire, parallel in basal half of sutural length, converging posteriad mid-length, bent along pronotal lobe and extended along bases to form complete basal striae joined with lateral striae.Anterior third of sutural and lateral striae distinctly punctate. Basal striae very shallow and hardly visible near lateral margins. Punctation coarse and sparse on basal third of elytral disc, except on narrow band along base and near sutural striae, intervals between coarse punctures mostly about 1.5 to 2 times as large as puncture diameters. Punctation on remaining surface of elytra very fine and sparse. Hind wings not reduced. Hypomera appearing impunctate. Mesepimera about four times as long as wide and three times as long as intervals to mesocoxae. Metaventrite flattened in middle, with impunctate mesal stripe, remaining mesal and entire lateral surfaces coarsely and very densely punctate, punctures mostly larger than puncture intervals. Mesocoxal lines parallel, mesocoxal areas about 0.02 mm, as fourth of shortest intervals to metacoxae. Exposed part of metanepisterna very narrow, with suture indicated by outer coarse punctures. Metepimera without longitudinal striae. Tibiae straight. Ventrite I without wrinkles, with coarse row of basal punctures narrowly interrupted in middle and several scattered rather large punctures on sides; remaining abdominal punctation very fine. Male protarsomere I to III slightly widened. Aedeagus ( Figs 8–10 ) 0.33–0.35 mm long.

Differential diagnosis: This new species is also a member of the B. lenta species-group and falls under the couplet 13 in the key to Philippine Baeocera ( LÖbl 2012) . Its aedeagal characters, especially the complex sclerotized parts of the internal sac, differ drastically from both species under this couplet, B. louisi LÖbl, 2012 and B. danielae LÖbl, 2012 . Baeocera onerosa sp. nov. may be readily distinguished from these two species by the much dense punctation on lateral parts of the metaventrite and by several rather large punctures on lateral parts of the abdominal ventrite I, situated posterior of basal puncture row. The internal sac of B. onerosa sp. nov. is similar to that of B. boettcheri (LÖbl, 1972) while the shape of the parameres and the elytral punctation differ drastically.

Figures

Figures 5–10. Aedeagi in Baeocera. 5–6 – B. glabra sp. nov., dorsal (5) and lateral (6) view [scale bar 0.1 mm]; 7 – ditto, apical part of aedeagus [scale bar 0.05 mm]; 8–10 – B. onerosa sp. nov.; 8 & 10 – Aedeagus, dorsal (8) and lateral (10) view [scale bar 0.1 mm]; 9 – Internal sac [scale bar 0.05 mm].