Malthininae, Kiesenwetter, 1852

Fanti, Fabrizio & Vitali, Francesco, 2017, Key to fossil Malthininae, with description of two new species in Baltic amber (Coleoptera Cantharidae), Baltic Journal of Coleopterology 17 (1), pp. 19-27 : 19-27

Key to fossil Malthininae included in amber

1. Pronotum with H-shaped raised surface; male abdomen 6-segmented.................................2.

-. Pronotum smooth; male with more abdominal segments........................................................3.

2. Body completely dark or with pronotal sides and elytra yellowish brown with black apex; basal angles of the pronotum prominent; 2.9 - 3.6 mm (Baltic and Rovno).......................... ............ Mimoplatycis notha Kazantsev, 2013

-. Head, pronotum and elytral base blackish, elytra reddish brown; basal angles of the pronotum rounded; 3.6 mm (Baltic)............... ............................. Mimoplatycis bicolor n. sp.

3. Elytra as long as abdomen or slightly shortened; antennae long; terminal urites little modified...............................................4.

-. Elytra shorter than abdomen; terminal urites modified (*)..................................................5.

4. Pronotum rectangular, with distinct margins and slightly truncated apical angles; 2.4 mm (Baltic)................................................................ ....... Macrocerus sucinopenninus ( Kuúka & Kania, 2010)

-. Pronotum cylindrical anteriorly narrowed; 3.2 mm (Baltic)...................................................... ...... Malthinus danieli Kuúka & Kania, 2010

5. Pronotum trapezoidal transverse, with pointed basal angles; elytra abbreviated, with caudal abdominal segments exposed; 2.5 mm (Burmese)........................................................... ... Archaeomalthodes rosetta Hsiao, Slipiñski & Pang, 2016

-. Pronotum without pointed posterior corners; elytra more abbreviated ( Malthodes )..........6.

6. Elytra short, not reaching the metatibiae; urotergite X trapezoidal, posteriorly enlarged; urosternite IX shortly elongated, large lobe-shaped, not-incised apically; 1.8 mm (Baltic)..... Malthodes caenozoicus n. sp.

-. Elytra long, evidently surpassing the metatibiae........................................................7.

7. Urotergite X not incised apically................ 8.

­. Urotergite X slightly incised apically.........12.

8. Urosternite IX apically forked (Baltic)......9.

-. Urosternite IX widened at apex or emarginated 11.

9. Urotergite X in small lobe; urosternite IX elongated, not-curved; 2.7 mm ...................... ... Malthodes ceranowiczae Kuúka & Kupryjanowicz, 2005

-. Urosternite IX elongated and curved..........10.

10. Urotergite X in elongated lobe; urosternite IX deeply forked; 2.8 mm ............................... ....... Malthodes sucini Kuúka & Kania, 2010

-. Urotergite X in square-shaped lobe, urosternite IX less forked; 2.3/ 2.5 mm .......... ................. Malthodes michalskii Fanti, 2017

11. Urotergite X small and shallowly emarginated; urosternite IX slightly concave at sides, shallowly and broadly emarginated at apex; 2.5 mm (Rovno)................................. ... Malthodes rovnoensis Kazantsev & Perkovsky, 2014

-. Urotergite X long, blunt, slightly widened at apex; urosternite IX strongly elongated, widened at end; 3.4 mm (Baltic).................... ... Malthodes kotejai Kuúka & Kupryjanowicz, 2005

12. Urotergite X elongated, parallel-sided with a triangular distal incision; urosternite IX very wide, with a broad rectangular distal incision; 3.4 mm (Rovno).................................. ......... Malthodes perkovskyi Kazantsev, 2010

Urotergite X twice as long as wide, with a shallow apical fork; urosternite IX the basal half arching towards the back, and apically strongly forked; 1.9 mm (Baltic)................... ... Malthodes serafini Kuúka & Kupryjanowicz, 2005

*Light brown, abdomen and terminalia not visible............................................................. ... Malthodes obtusus Förster (Brunstatt brown coals)