Three new genera of large marsh beetles (Coleoptera: Scirtidae) from Valdivian temperate rain forests of southern South America Author Ruta, Rafał text Zootaxa 2021 2021-10-08 5048 4 451 485 journal article 4049 10.11646/zootaxa.5048.4.1 243a784a-5175-4420-b3ca-9a05b8ca81fe 1175-5326 5556650 C1AE78B5-8BC2-4BEF-90E9-14CED750130F A tentative key to genera of South American Scirtidae 1. Hind femora enlarged, saltatorial......................................................................... 2 -. Hind femora of normal size, not saltatorial................................................................. 4 2. Prosternal process wide, tear-shaped, forming flat plate between procoxae; clypeus with produced anterolateral angles...................................................................................... Prionoscirtes Champion -. Prosternal process very narrow, laminar, forming sharp edge between procoxae; clypeus rectangular, anterolateral angles not produced............................................................................................ 3 3. Coxae separated, trochanters exposed............................................................. Ora Clark -. Coxae touching along midline, trochanters hidden................................................. Scirtes Illiger 4. Tibiae without carinae, body very narrow, TL/EW 3.8–4.4.................................... Stenocyphon Lawrence -. Tibiae with paired longitudinal carinae, body wider, TL/EW <2.5, elongate to oval................................. 5 5. Basal portion of elytra 1.6–2.0× wider than basal portion of pronotum, body elongate, TL/EW 1.9–2.5.................. 6 -. Basal portion of elytra as wide as basal portion of pronotum or only 1.3–1.4× wider, body oblong oval, TL/EW.......... 8 6. Body small, TL < 3 mm ................................................................................ 7 -. Body large, TL> 9 mm ................................................................. Argelodes gen. nov. 7. Sides of pronotum with outgrowths, known only from Roraima tepui......................... Exagonthus Waterhouse -. Sides of pronotum without outgrowths, known from Chile ....................................... Chilarboreus Ruta 8. Scape enlarged, anterior margin forming sharp, anterior carina, antennomere 3 reduced, very small, sometimes barely visible (antennomeres 4–10 more or less dilated, often serrate to pectinate)....................... Prionocyphon Redtenbacher -. Scape cylindrical, anterior margin never sharp, antennomere 3 small but easily seen................................ 9 9. Subgenal ridge with buttonhole configuration............................................... Contacyphon Gozis -. Subgenal ridge without buttonhole configuration........................................................... 10 10. Head with deep subantennal grooves..................................................................... 11 -. Head without or with shallow subantennal grooves.......................................................... 12 11. Mesoventral process wide, as long as width to transverse......................................... Calvariopsis Ruta -. Mesoventral process elongate, ca. 1.6× longer than its maximum width........................... Mucronotus gen. nov. 12. Large species, TL> 9 mm , body sides subparallel............................................. Solierodes gen. nov. -. Smaller species, TL< 6 mm , body sides usually rounded...................................................... 13 13. Anterolateral angles of pronotum strongly angled, pronotum transversely rectangular; molar region of mandibles without spines................................................................................. Anticyphon Ruta -. Anterolateral angles of pronotum rounded, pronotum trapezoidal with semicircular anterior margin, molar region of mandibles with numerous spines............................................................ Pseudomicrocara Armstrong