Tumboecus FAGEL, 1959

Irmler, Ulrich, 2015, New Neotropical genera and species of the tribe Osoriini (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 65 (1), pp. 173-196 : 176-177

Tumboecus FAGEL, 1959

The genus Tumboecus was created by FAGEL (1959) on the basis of one African female specimen. The African species, T. nitidus , is characterised by pentamere tarsi, non-geniculate antennae, protibia not enlarged, but with five long spines at its outer edge, normally long elytra and the presence of hind-wings. These characters are also found in the Neotropical species of the genus. In contrast to the African species with fine punctation, the Neotropical species are densely and coarsely punctate and punctures are setiferous. However, this difference does not justify creating a new genus. Unfortunately, the African specimen is a female. Thus, nothing is known about its aedeagal structure. The Neotropical species of the genus have an aedeagus that resembles that of the genera of the Osorius complex. It has no paramera and a specific endophallus, which resembles those of the genus Neosorius FAGEL, 1959 . A generic difference between the African and Neotropical species can be only established, if males of African species are found and the aedeagi differ considerably from the Neotropical species.

The species of the genus Tumboecus FAGEL, 1959 are between 2 and 3 mm long. They resemble small species of the genus Osoriellus FAGEL, 1959 , but differ in the presence of an endophallus and the non-geniculate 1. Protibia and mesotibia with setae at outer edge, antennae not angulate ..................................................................... 2

- At least protibia with several spines on outer edge, antennae mostly angulate .......................................................... 8

2. Pronotum in front of posterior edge deeply emarginate ................................................................................................ 3

- Pronotum in front of posterior edge not emarginate ..................................................................................................... 5

3. Eyes small, only few omatidia present, elytra short, twice as wide as long ..................... Mimotrochus IRMLER, 1987

- Eyes of normal size, usually distinctly prominent, elytra longer, as wide as or longer than wide ............................ 4

4. Pronotum laterally margined including the emargination in front of posterior angles, posterior angles with depres- sion ............................................................................................................................................. Mimogonus FAUVEL, 1903

- Emargination of pronotum not margined .......................................................................... Mimogonia COIFFAIT, 1978

5. Clypeus emarginate; head and pronotum with broad lateral margin .......................... Craspedus BERNHAUER, 1908

- Clypeus not emarginate; head not margined, pronotum with a fine lateral margin .................................................. 6

6. Elytra with sutural striae .................................................................................................... Holotrochus ERICHSON, 1839

- Elytra without sutural striae or only remains of striae ................................................................................................... 7

7. Body pubescent, eyes normally large and prominent, elytra longer than wide ............. Holotrochopsis FAGEL, 1955

- Body not pubescent, eyes short, not prominent, elytra short, much wider than long, habitus ( Fig. 18 A-F, 19A, B) ................................................................................................................................................... Paratorchus MCCOLL, 1985

8. Antennae angulate, first antennomere elongate, at least as long as three following antennomeres ....................... 11

- Antennae not angulate, first antennomere thicker than following antennomere, but shorter than three following antennomere ........................................................................................................................................................................ 9

9. Without eyes ...................................................................................................................................................................... 10

- With eyes, tarsi pentamere, habitus ( Fig. 15E, F ) ................................................................... Tumboecus FAGEL, 1959

10. Tarsi with five tarsomeres, habitus ( Fig. 16 A-D) ..................................................................... Neorhabdopsis gen. nov.

- Tarsi with three tarsomeres, habitus ( Fig. 17B ) ........................................................... Tavakilianidia OROUSSET, 1985

11. Tarsi with 3 tarsomeres ..................................................................................................................................................... 12

- Tarsi with 5 tarsomeres ..................................................................................................................................................... 13

12 Eyes with one omatidium, habitus ( Fig. 15A ) ...................................................................... Ouloglene NOTMAN, 1925

- Eyes small or normally large, habitus ( Fig. 15B, C, D ) ........................................................ Oryssoma NOTMAN, 1925

13. Pronotum without lateral margin, clypeus with two long acute teeth, head and pronotum dull, body totally covered with setae ........................................................................................................................ Anancosorius BERNHAUER, 1908

- Pronotum with lateral margin, clypeal teeth, if present, broad or obtuse ................................................................. 14

14. Shoulders of elytra dentate .................................................................................................... Osoriocanthus FAGEL, 1959

- Shoulders of elytra not dentate ........................................................................................................................................ 15

15. Protibia semicircular, comb of inner emargination not visible in posterior aspect, habitus ( Fig. 17A ) .....................

.............................................................................................................................................................. Osoriosetus gen. nov.

- Protibia broad, but never semicircular, comb of inner emargination at least partly visible in posterior aspect .... 16

16. Pronotum at least slightly emarginate in front of posterior angles, lateral margin of pronotum widened to posterior angles .................................................................................................................................................................................. 17

- Margin of pronotum equal in width, sides evenly narrowed from anterior to posterior angles or with emargination in front of posterior angles ............................................................................................................................................... 18

17. Posterior side of protibia with setae and spines .................................................... Osorius GUÉRIN-MÉNEVILLE, 1829

- Posterior side of protibia only setose, without short and thick spines .......................... Antillosorius IRMLER, 2010b

18. Posterior side of protibia only setose, without thick spines, aedeagus without endophallus ............................... ................................................................................................................................................ Osoriellus FAGEL, 1959

- Posterior side of protibia with spines and setae, aedeagus with endophallus, habitus ( Fig. 16E, F ) ........................... ........................................................................................................................................................... Neosorius FAGEL, 1959

antennae. Referring to the aedeagal structure and the non-geniculate antennae, Tumboecus seems to be intermediate between the genera of the Osorius complex and the other genera of the tribe Osoriini .

Figures

Fig. 18: Head, pronotum, and elytra of Paratrochus tilli (A), P. brasiliensis (B), P.chilensis (C), P. columbiensis (D), P. panamae (E), and P. chiriquensis (F); scale bar: 0.5 mm.

Fig. 15: Head, pronotum, and elytra of Ouloglene barberi (A), Oryssma schwarzi (B), O. politum (C), O. exalatum (D), Tumboecus verhaaghi (E), and T. struyvei (F); scale bar: 0.5 mm.

Fig. 16: Head, pronotum, and elytra of Neorhabdopsis brasiliensis (A), N. pecki (B), N. lutzi (C), N. panamae (D), Neosorius brasiliensis (E), and N. mexicanus (F); scale bar: 0.5 mm.

Fig. 17: Head, pronotum, and elytra of Osoriosetus hanagarthi (A) and Tavakilianidia anophtalma (B); scale bar: 0.5 mm.