Cephenniini, Reitter, 1882

Jałoszyński, Paweł, 2023, Papuamicrus gen. n., a new genus of Cephenniini from New Guinea (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 5339 (5), pp. 492-500 : 497-498

Updated key to extant genera of Cephenniini

1 All legs with ‘trochantellus’; Neotropical.................................................................. 2

- Legs lacking ‘trochantellus’............................................................................. 6

2 Prosternal process absent.............................................. Pseudocephennium Reitter [Neotropical]

- Prosternal process present, clearly separating procoxae....................................................... 3

3 Prosternal process in lateral view strongly bent or curved posterad, with apex directed posterad or posteroventrad......... 4

- Prosternal process in lateral view nearly straight, with apex directed ventrad...................................... 5

4 Abdomen modified, with conspicuously shortened second visible sternite, additionally hidden under dense fringe of long setae along posterior margin of first visible sternite; prosternal process in ventral view subtriangular, narrowing posterad to rounded apex; procoxal cavities closed posteriorly.............................. Monstrophennium Jałoszyński [Neotropical]

- Abdomen unmodified, first visible sternite lacking posterior fringe of long setae; prosternal process in ventral view nearly parallel-sided or rhomboidal with truncate or slightly emarginate apex; procoxal cavities open posteriorly................................................................................... Paracephennium O’Keefe [Neotropical]

5 Prosternal process in ventral view with deeply bifurcate posterior margin............. Furcodes Jałoszyński [Neotropical]

- Prosternal process in ventral view with truncate or slightly concave posterior margin, not bifurcate................................................................................................ Shyri Jałoszyński [Neotropical]

6 Pronotum with pair of longitudinal C-shaped furrows......................... Eutheimorphus Franz & Löbl [Oriental]

- Pronotum lacking C-shaped furrows...................................................................... 7

7 Pronotum with pair of mediolateral glandular openings....................................................... 8

- Pronotum without mediolateral openings................................................................... 9

8 Antennae 11-segmented, with asymmetrical and loosely assembled dimerous club...... Trichokrater Jałoszyński [Oriental]

- Antennae 10-segmented, with oval and symmetrical club formed by two fused antennomeres...................................................................................................... Trurlia Jałoszyński [Oriental]

9 Antennae 10-segmented, with large club formed by two fused antennomeres.......... Clavomicrus Jałoszyński [Oriental]

- Antennae clearly 11-segmented......................................................................... 10

10 Prothoracic basisternal region about as long as procoxal rests or longer..................... Etelea Csiki [W Palaearctic]

- Prothoracic basisternal region clearly shorter than procoxal rests............................................... 11

11 Prosternal process absent.............................................................................. 12

- Prosternal process present............................................................................. 13

12 Antenna with indistinct trimerous club............................... Cephennium Müller & Kunze [W Palaearctic]

- Antenna with distinct dimerous club................................. Nanophthalmus Motschulsky [W Palaearctic]

13 Pronotum lacking antebasal pits......................................................................... 14

- Pronotum with at least one pair of antebasal pits or foveae.................................................... 18

14 Antennae gradually thickened, lacking abruptly delimited club; prosternal process in ventral view extremely thin, lamellate, in lateral view narrowly subtriangular and strongly projecting ventrad beyond ventral margins of procoxae...................................................................................... Cephazteca Jałoszyński [Neotropical]

- Antennae with dimerous or trimerous clubs; prosternal process in ventral view subquadrate, subtriangular or subrectangular with rounded or truncate tip, in lateral view not strongly projecting ventrally..................................... 15

15 Antennae with trimerous clubs; prothorax with two pairs of internal ‘cavities’ (visible as translucent oval areas on sides in posterior half)........................................................................ genus X1 (Sulawesi)

- Antennae with clearly dimerous clubs; prothorax with at most one pair of internal ‘cavities’......................... 16

16 Prosternal process in ventral view about as long as broad; posterior margins of mesocoxal rests not carinate; aedeagus with internal lentiform sclerotization at base........................................ Papuamicrus gen. n. [New Guinea]

- Prosternal process clearly elongate; posterior margins of mesocoxal rests carinate; aedeagus lacking internal basal lentiform sclerotization........................................................................................ 17

17 Antennal club composed of two unilaterally expanded antennomeres; each prothoracic hypomeron partly divided into anterior and posterior region by transverse carina; notosternal sutures partly obliterated; elytra lacking macrosetae................................................................................... Cephennococcus Jałoszyński [Oriental]

- Antennal club composed of two symmetrical antennomeres; prothoracic hypomera undivided; notosternal sutures developed on entire length; elytra with numerous long macrosetae............................... Indomicrus Jałoszyński [Oriental]

18 Basal elytral foveae large and filled with dense setae........................................................ 19

- Basal elytral foveae, if discernible, asetose................................................................ 20

19 Prosternal process short, not projecting ventrally beyond procoxae and not bent................................................................................................... Hlavaciellus Jałoszyński [Oriental, Himalaya]

- Prosternal process long, projecting ventrally beyond procoxae and bent posteriorly at obtuse angle........................................................... Cephennodes Reitter [Afrotropical, Palaearctic, Oriental, Nearctic, Australian]

20 Prosternal and mesoventral processes inversely T-shaped in cross-section, so that mesal portions of pro- and mesocoxae are hidden under expanded ventral surface of each process...................................................... 21

- Prosternal and mesoventral processes subtriangular or trapezoidal in cross-section, mesal portions of pro- and mesocoxae visible in ventral view................................................................................ 22

21 Pronotum with sublateral carinae; elytra with subhumeral carinae................... Cephennula Jałoszyński [Oriental]

- Pronotum lacking sublateral carinae; elytra lacking subhumeral carinae.............. Lathomicrus Jałoszyński [Oriental]

22 Each elytron with humeral carina; pronotum with more than two pairs of small but deep lateral foveae.......................................................................................... Foveomicrus Jałoszyński [Oriental]

- Humeral carinae absent; pronotum with at most two pairs of lateral pits......................................... 23

23 Prothorax with posterolateral internal ‘cavities’ (in dried specimens visible as translucent areas in posterior half).............................................................................. Pomphopsilla Jałoszyński [Afrotropical]

- Prothorax lacking internal ‘cavities’............. Cephennomicrus Reitter [Afrotropical, Palaearctic, Oriental, Australian]