Stenichnini

Jałoszyński, Paweł, 2023, Notes on the Western Palaearctic genus Leptocharis Reitter (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 5353 (5), pp. 430-440 : 438-439

3. Identification key to Eurasian (incl. New Guinea) genera of Stenichnini

Eurasian genera of Stenichnini can be identified using the following key (taxa from New Guinea that may occur in SE Asia are also included):

1 Pronotum subconical, broadest at base, AND each lateral pronotal carina mesally accompanied by broad longitudinal impression with sharply marked mesal margin............................................ Siamitoides Jałoszyński [ Indonesia]

- If pronotum subconical, then lateral pronotal carinae absent or mesally not accompanied by impressions; if pronotum with lateral longitudinal impressions, then broadest at or in front of middle............................................ 2

2 Each femoral clava dorsally with longitudinal groove bearing submedian oval glandular opening...................... 3

- Femoral clava dorsally lacking longitudinal groove and oval opening............................................ 4

3 Constriction between antennomeres 10 and 11 similar as between all remaining flagellomeres; antennae conspicuously long and slender, nearly filiform................................ Loeblites Franz [ China, Philippines, Thailand, Malaysia]

- Antennomere 11 sits tightly on apex of 10, without constriction; antennae not filiform...... Syndicus Motschulsky [ Bhutan, Cambodia, China, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, Philippines, Singapore,SriLanka, Thailand, Vietnam]

4 Mesoventral intermesocoxal process absent on entire length of mesocoxae................. Turkocharis gen. n. [ Turkey]

- Mesoventral intermesocoxal process present at least in anterior half of mesocoxae.................................. 5

5 Pronotum with deep median longitudinal groove extending from near base to middle of pronotal disc......................................................................... Aenigmaphes Jałoszyński [ Papua New Guinea, Sulawesi]

- Pronotum lacking median longitudinal groove.............................................................. 6

6 Pronotum at each side near posterior corner with long erect penicillus of several setae................................................................................... Penicillidmus Jałoszyński [ Papua New Guinea, Philippines]

- Pronotum lacking posterolateral penicilli................................................................... 7

7 Mesoventral intermesocoxal process densely covered with short erect bristles; pair of basal elytral foveae connected by inversely U-shaped groove extending onto elytral articulating lobe.......................................... Horaeomorphus L.W. Schaufuss [ Brunei, China, Indonesia, Japan, Laos, Malaysia, Nepal, Philippines, Singapore, Taiwan, Thailand, Vietnam]

- Mesoventral intermesocoxal process sparsely covered with thin setae or asetose; basal elytral pits, if present, not connected by inversely U-shaped groove.............................................................................. 8

8 Head in lateral view subtriangular, ventrally flattened, dorsally strongly convex, with highest site above antennal fossae, strongly declining anterad and less strongly posterad......................................................... 9

- Head in lateral view rounded or subrectangular, not subtriangular.............................................. 10

9 Vertex, prosternum, mesoventrite, metaventrite behind mesocoxae and abdominal sternites all with small paired tufts and/or rosettes of bristles; hypostomal sutures present; maxillary palpomere 4 elongate subconical................................................................................. Siamites Franz [ Indonesia, Malaysia, Thailand, Vietnam]

- Body lacking paired tufts and rosettes of bristles; hypostomal sutures lacking; maxillary palpomere 4 conspicuously slender, rod-like...................................... Elacatophora L.W. Schaufuss [ India, Indonesia, Malaysia, Thailand]

10 Hypostomal sutures present............................................................................ 11

- Hypostomal sutures absent............................................................................. 19

11 Antennae with sharply demarcated dimerous clubs; posterior margin of vertex strongly convex posteriorly.......................................................................................... Nogunius Jałoszyński [ Japan]

- Antennae gradually thickened or with clubs composed of more than 2 antennomeres; posterior margin of vertex nearly straight and transverse....................................................................................... 12

12 Eyes conspicuously large, in lateral view occupying entire length of head, anteriorly adjacent to antennal fossae, posteriorly to occipital constriction; body short oval with transverse pronotum................... Obesoconnus Jałoszyński [ Thailand]

- Eyes in lateral view occupying only part of head, either adjacent only to antennal fossae or to occipital constriction, or not adjacent to neither of them, or lacking; body elongate, pronotum as long as broad or (more frequently) elongate......... 13

13 Prosternum laterally fused with inner regions of hypomera; pronotum with broad dorsolateral longitudinal groove at each side......................................................................... Sinonichnus Jałoszyński [ China]

- Prosternum laterally demarcated from hypomera by notosternal sutures; pronotum lacking dorsolateral longitudinal grooves. .................................................................................................. 14

14 Each elytron with one large basal fovea filled with dense setae...................... Neuraphes Thomson [Palaearctic]

- Each elytron with one asetose fovea, in some cases small or even barely discernible............................... 15

15 Hypomeral ridges absent.............................................................................. 16

- Hypomeral ridges present.............................................................................. 17

16 Mandibles subtriangular; hypostomal sutures posteriorly meeting at middle; mesoventral process posteriorly fused with metaventrite; pronotum with lateral carinae visible at least in posterior half; aedeagus lacking parameres.................................................................................... Rutaraphes Jałoszyński [ Japan, Taiwan]

- Mandibles sickle-shaped, conspicuously long and slender; hypostomal sutures posteriorly broadly separated; mesoventral process posteriorly not fused with metaventrite; pronotum lacking lateral carinae; aedeagus with parameres........................................................................................ Stenichnus Thomson [Holarctic]

17 Hypostomal sutures meeting posteriorly, area between them triangular; pronotum lacking lateral carinae.............................................................................. Leptoderoides Croissandeau [E Mediterranean]

- Hypostomal sutures posteriorly broadly separated, area between them trapezoidal; pronotum with lateral carinae at least in posterior third....................................................................................... 18

18 Pronotum with thick bristles on sides; aedeagus with parameres, lacking basal lentiform sclerotization.......................................................................................... Scydmoraphes Reitter [Palaearctic]

- Pronotum lacking bristles; aedeagus lacking parameres, with basal lentiform sclerotization.......................................................... Stenichnodes Franz (subgen. Parastenichnaphes Franz ) [ India, Indonesia, Sri Lanka]

19 Head in ventral view with inversely U-shaped, sharply marked and usually glossy impression on submental area............................................................. Himaloconnus Franz [ India, Japan, Nepal, Taiwan, Thailand]

- Head in ventral view lacking U-shaped impression.......................................................... 20

20 In ventral view, lateral corner of each metacoxa broadly separated from lateral margin of metaventrite by posterolateral metaventral lobe.......................................................... Leptocharis Reitter [W Palaearctic]

- Lateral corner of each metacoxa adjacent to lateral metaventral margin.......................................... 21

21 Each elytron with single, well-visible basal fovea situated in deep, round basal impression............................................................................ Microscydmus Saulcy & Croissandeau [Palaearctic & Oriental]

- Each elytron with two variously distinct basal foveae; if foveae vestigial and not discernible then round and deep basal elytral impression lacking................................................................................... 22

22 Metaventral intermetacoxal process lacking pair of elongate, slender spines........... Euconnus Thomson [cosmopolitan]

- Metaventral intermetacoxal process composed of pair of elongate, slender spines.................................. 23

23 Pronotum oval, broadest in front of middle, strongly narrowing both posteriorly and anteriorly; antennae with indistinctly delimited trimerous clubs; aedeagus strongly asymmetrical........................... Schuelkelia Jałoszyński [ China]

- Pronotum subconical, broadest at base and strongly narrowing anteriorly; antennae with trimerous clubs, but antennomere 9 only slightly broader than 8 and clubs appear dimerous; aedeagus symmetrical................................................................................. Napoconnus Franz [ Indonesia, Malaysia, Nepal, Singapore, Thailand]