Afroeudesis subgen

Jałoszyński, Paweł, 2020, Corrections to the classification of the Neotropical ant-like stone beetles misplaced in Euconnus Thomson (Coleoptera, Staphylinidae, Scydmaeninae). Part 1., Zootaxa 4755 (2), pp. 251-270 : 268-269

Tridensius and Sibylloconnus are placed within the subgroup 2B1, which is characterized by i) lateral submental sutures absent; ii) anterior mesoventral process absent or indistinguishably fused with mesoventral process; and iii) prosternum completely demarcated from hypomera (both in front of and behind procoxal cavities). This informal subgroup includes: Afroeudesis subgen

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Eudesoides, Archiconnus , Euconnomorphus , Euconnus , Napoconnus , Plaumanniola , Sibylloconnus , Tridensius , and Venezolanoconnus . These genera can be identified using the following key:

antenna strongly, gradually thickened, strongly flattened and compactly assembled (i.e., lacking constrictions between antennomeres).................................................................................. Plaumanniola

- Antenna not entirely or distally strongly flattened, and at least distal flagellomeres demarcated by constrictions........... 3

3. Anterior portion of mesoventral process with pair of sublateral arms curved anterad, forming trident-like structure; frons in dorsal view anteriorly emarginate; adcoxal part of prothoracic hypomeron (mesad hypomeral ridge) divided into narrow anterior and subtriangular posterior portions............................................................... Tridensius

- Mesoventral process lacking anterior trident-like structure; frons not anteriorly emarginate; adcoxal part of hypomeron not divided.............................................................................................. 4

4. Prothoracic hypomera anteriorly strongly expanded mesad, so that anterior margin of prosternum is only half as long as posterior margin................................................................................ Sibylloconnus

-. Hypomera anteriorly not strongly expanded mesad, so that anterior margin of prosternum is comparably long as posterior margin or only slightly shorter............................................................................... 5

5. Metacoxae narrowly separated by pair of long pointed spines directed posterad.................................... 6

- Metacoxae contiguous or separated by metaventral process lacking pair of spines................................... 7

6. Antennae gradually thickened; parameres modified, in lateral view their proximal half or more as broad as median lobe.......................................................................................... Venezolanoconnus

- Antennae with sharply delimited club; parameres unmodified, slender, rod-like........................... Napoconnus

7. Maxillary palpomere III conspicuously broadened, at most twice as long as broad and broader than 1/3 width of head; metacoxae contiguous............................................................................ Archiconnus

- Maxillary palpomere III not conspicuously broadened, more than twice as long as broad and not broader than 1/3 width of head; metacoxae at least narrowly (but often broadly) separated..................................................... 8

8. Basisternum much shorter than procoxal rests, often vestigial; frontoclypeal groove present; parameres unmodified, slender and rod-like...................................................................................... Euconnus

- Basisternum about as long as procoxal rests; frontoclypeal groove absent; parameres modified, in lateral view their proximal 3/4 or more as broad as median lobe, only short apical regions slender............................... Euconnomorphus