Baeocera bifurcate, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 85-87

Baeocera bifurcate sp. nov.

Figs 34-39

Holotype: MHNG; ♂; Indonesia, Bali Lake Buyan , ca 1200 m 8.-9.XI.1991, I. Löbl degr. forest floor litter.

Paratypes: MHNG; 1 ♀; with the same data as the holotype. – MHNG; 1 ♂; Bali Badingkayu , 300-500 m 10.-14.XI.1991, I. Löbl forest floor litter, bark.

Etymology: The species epithet is a Latin adjective referring to the fork-like shape of the parameres.

Description: Length 1.23-1.25 mm, width 0.88 mm. Body strongly convex, without obvious microsculpture. Head and body dark brown to blackish-brown, abdomen, femora and tibiae lighter, tarsi and antennae yellowish. Length/width ratio of antennomeres as follows: III 23/5: IV 24/5: V 28/5: VI 25/5: VII 28/7: VIII 23/5: IX 33/10: X 34/12: XI 41/13. Lateral contours of pronotum and elytra separately arcuate. Pronotum with hardly visible punctation and setation (100x magnification), lateral margins convex, anterior margin broad, basal lobe small; lateral pronotal carinae concealed in dorsal view. Minute tip of scutellum exposed. Elytra fairly narrowed apically, not covering abdominal apex, lateral margin carinae concealed or hardly visible near base in dorsal view, sutural striae curved at bases to form basal striae abruptly ending about at mid-width of elytra; adsutural areas flat, parallel, punctate. Elytral punctation very fine and similar to that on pronotum along basal margins and on apicolateral areas, coarse and densely punctate on remaining surface, many coarse punctures about as large as puncture intervals. Epipleural striae entire, punctate, supraepipleural areas impunctate. Hind wings well developed. Hypomera impunctate, smooth. Mesoventral suture indistinct, mesoventrite distinctly punctate, without median ridge. Mesepimera each about twice as long as wide and twice as long as interval to metacoxae. Median part of metaventrite somewhat flattened, with small smooth area in centre delimited by coarse punctation. Lateral parts of metaventrite coarsely punctate, except on narrow smooth areas near metacoxae; punctures not elongate, to part about as large as puncture intervals. Submesocoxal lines parallel, with marginal punctures not extending laterally, submesocoxal areas about 0.02 mm long, about as fourth of interval to metacoxae. Metanepisternal suture indicated by outer row of coarse punctures. Tibiae straight. Sternite 1 with basal punctures uninterrupted in middle, coarse and slightly elongate on sides, basal wrinkles absent; punctation posterior basal puncture row distinct, becoming very fine apically.

Male: Protarsomeres hardly widened. Aedeagus (Figs 34-38) 0.34-0.35 mm long. Median lobe and parameres symmetrical, moderately sclerotized. Basal bulb of median lobe longer than apical process, latter inflexed, tapering, with acute tip and concave ventral side. Articular process indistinct. Parameres conspicuously long, extending far beyond tip of median lobe, straight in dorsal and lateral views, narrowed anterior level of tip of median lobe. Internal sac with complex basal sclerites forming arcuate flagellum and curved guide-sclerite joined to laterally expanded base. Membranes around apex of guide-sclerites forming small vesicle covered by scale-like structures.

Female: Ovipositor (Fig. 39) with long distal gonocoxite strongly narrowed toward apical half, narrow and parallel-sided in long apical section, bearing single long apical seta, gonostyle absent.

Distribution: Indonesia: Bali.

Type locality: Bali, Lake Buyan , ca 1200 m.

Comments: This species is a member of the B. lenta group and possibly allied with B. punctata (Löbl, 1975) from New Guinea. The shape of the sclerotized pieces of the internal sac are, however, diagnostic. In addition, most elytral punctures are in B. punctata larger than puncture intervals.