Baeocera roxas, Löbl, 2023

Löbl, Ivan, 2023, Three new species of Scaphidiinae from Mindanao and Palawan (Coleoptera: Staphylinidae), Journal of Tropical Coleopterology 4, No. 2, pp. 1-10 : 7-9

Baeocera roxas sp. nov.

urn:lsid:zoobank.org:act:85FCB636-D5F7-4176-8EAE-CED15EA9AA02

( Figures 10-12 )

Type material. Holotype male: PHIL.: Palawan Roxas , III.2020 [005 PA] ( MHNG).

Description. Length 1.85 mm, width 1.35 mm. Head, pronotum and elytra black. Hypomera and mesoventrite blackish with reddish shine, mesanepisterna, metaventrite, and metanepisterna black. Abdomen uniformly very dark brown. Femora and tibiae rufous, tarsi yellowish. Antennomeres I and II rufous, III to V yellowish, following antennomeres brown. Length/width ratios of antennomeres as: III 18/9: IV 20/9: V 29/10: VI 24/12: VII 47/10: VIII 40/13: IX 53/18 (segments X of both antennae broken off posterior of base and segments XI missing). Lateral margins of pronotum and elytra separately rounded. Pronotum with lateral margin carinae hardly visible in dorsal view, discal punctation very fine. Hypomera impunctate. Scutellum triangular, small. Elytra weakly narrowed apicad, lateral margins nearly evenly arcuate, lateral margin carinae exposed throughout in dorsal view, sutural striae deep, curved near base and extending lateral to form basal striae gradually approximating basal margin and joining lateral striae. Punctation on adsutural areas, near base and near lateral margins about as fine as that on pronotum; punctation coarse and dense on lateral area situated between basal and apical third of disc, with punctures to part as large as puncture intervals; punctation rather fine and sparse on remaining surface. Exposed tergites very finely punctate. Mesoventrite hardly convex in middle, with three mesal longitudinal striae. Mesepimeon large, about 4 times as long as wide and 5 times as long as interval to mesocoxa. Metaventrite convex in middle, with U-shaped row of coarse punctures anterior of metacoxal process, mesal area appearing impunctate, lateral areas very finely and sparsely punctate; submesocoxal areas 0.03 mm long, with coarse marginal punctures extending posterior of mesepimeral tip. Metanepisternum convex, about 0.12 mm wide, gradually narrowed anteriad, with suture impunctate, nearly straight, reaching margin of metepimeron. Protibiae and mesotibiae straight, metatibiae slightly curved. Abdomen lacking microsculpture. Ventrite I with basal punctures coarse, not elongate; remaining abdominal punctation very fine and sparse.

Male. Protarsomeres I to III weakly widened and bearing tenet setae, protarsomere I narrower than apex of protibia (mesotarsomeres broken off and missing). Lobe of ventrite VI 0.05 mm long, with rounded tip. Aedeagus as Figs 10-12 , 0.59 mm long, strongly sclerotized.

Female. Unknown.

Etymology. The species epithet is a noun, the name of the type locality.

Diagnosis. Baeocera roxas is also a member of the B. monstrosa group and similar with B. alamada has the aedeagus with the apical process of the median lobe overlapped by the basal bulb, a simple right paramere and a lobed left paramere. It is distinguished from other species sharing these features by the shape of the parameres and the structure of the internal sac. It differs notably from B. alamada and B. alticola by the antennomere V much longer than antennomere IV and the pattern of elytral punctation.

Figures

Figures 8-12. Male genitalia. 8, 9. Baeocera alamada sp. nov., aedeagus; 8. Internal sac, scale = 0.1 mm; 9. Parameres in ventral view, scale = 0.1 mm; 10-12. Baeocera roxas sp. nov.; 10. Aedeagus in dorsal view, scale = 0.1 mm; 11. Aedeagus in lateral view, scale = 0.1 mm; 12. Parameres in ventral view, scale = 0.1 mm.