Baeocera, Erichson, 1845

Löbl, Ivan & Smetana, Aleš, 2021, On the Baeocera Erichson (Coleoptera: Staphylinidae: Scaphidiinae) of Sabah, Malaysia, and a tale on mystified biodiversity, J. Insect Biodiversity 23 (2), pp. 23-42 : 26-27

Key to the Sabah species of Baeocera

1 Lateral parts of metaventrite impunctate. Metanepisternum wide, with impunctate suture. Parameres asymmetrical .....................2

- Lateral parts of metaventrite coarsely and densely punctate. Metanepisternum fused or narrow, with punctate suture. Parameres symmetrical ........................................................................................................................................................................................3

2 Antennomeres V and VI similar, XI about 1.5 times as long as X............................................................................. B. barbara Löbl

- Antennomeres V and VI disimilar, VI much wider than V, XI about 2 times as long as X ......................................... B. doriae (Pic)

3 Elytron and pronotum very finely punctate, elytron lacking basal stria................................................................. B. secreta sp. nov.

- Elyton entirely or to part much coarser punctate than pronotum, with basal stria.............................................................................4

4 Elytron with basal stria shortened, not joined with lateral stria .........................................................................................................5

- Elytron with basal stria entire, joined with lateral stria......................................................................................................................6

5 Centre of ventrite I coarsely punctate, with punctures much larger than those on following ventrites. Parameres abruptly narrowed at about level of tip of median lobe ................................................................................................................. B. incisa (Löbl)

- Centre of ventrite I impunctate or with few extremely fine punctures, similar to those on following ventrites. Parameres notched at level of tip of median lobe................................................................................................................................... B. sedata sp. nov.

6 Metanepisternu fused, delimited by outer row of metaventral punctures, without distinct suture. Internal sac with complex sclerites.......................................................................................................................................................................................................7

- Metanepisternum distinctly delimited by suture. Internal sac simple, not sclerotized or with simple, narrow rod...........................8

7 Metaventrite coarsely punctate laterally, lacking impressed antecoxal puncture row. Ventrite I very finely punctate posterior of basal puncture row.......................................................................................................................................... B. serendibensis (Löbl)

- Metaventrite impunctate anteriad impressed antecoxal puncture row. Ventrite I with scattered coarse punctures posterior of basal puncture row....................................................................................................................................................... B. omnigena sp. nov.

8 Ventrite I appearing impunctate posterior of basal row of coarse punctures .....................................................................................9

- Ventrite I distinctly punctate posterior of basal row of coarse punctures.........................................................................................14

9 Parameres notched posterior mid-length, in apical third lobed, as wide or wider than anterior mid-length .......... B. kinabalua Löbl

- Parameres not notched, nor apically lobed.......................................................................................................................................10

10 Apical third to half of parameres distinctly narrowed......................................................................................................................11

- Apical third to half of parameres not narrowed................................................................................................................................13

11 Parameres straight, abruptly narrowed posterior of mid-length......................................................................... B. segregata sp. nov.

- Parameres arcuate, gradually narrowed posterior of mid-length......................................................................................................12

12 Internal sac with membranous vesicle bearing scale-like structures; flagellar guide-sclerite long, nearly reaching apex of flagellum..................................................................................................................................................................... B. sarawakensis Löbl

- Internal sac without membranous vesicle; flagellar guide-sclerite short, reaching about mid-length of flagellum ............................ ............................................................................................................................................................................ B. seigugata sp. nov.

13 Flagellar-guide sclerite narrow, not widened basally, looped and not joined with oblique sclerite ........................... B. rufula (Löbl)

- Flagellar-guide sclerite widened basally and joined with oblique, ring-shaped sclerite ........................................... B. rudis sp. nov.

14 Elytral disc entirely, nearly evenly and distinctly punctate ................................................................................. B. semirufa sp. nov.

- Apical fourth to half of elytral disc very finely, indistinctly punctate, much finer than anterior coarsely punctate discal surface ..... .................................................................................................................................................................................. B. obliqua (Löbl)