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 key to species of Mucronotus gen. nov. 1. Elytra with large, oval punctures; pronotum glossy, granulate punctures only present on sides of pronotum; processes of trigonium longer than pala; bursal sclerite with transverse bar in anterior portion; females without dimorphic features........................................................................................... M. schwabei ( Pic, 1938 ) -. Elytra with small, dense punctures; pronotum matt, granulate punctures coarser, absent in the central portion of the pronotal disc; processes of trigonium shorter than pala; bursal sclerite without transverse bar in anterior portion; females with more convex pronotum and unusual setation on pronotal disc.......................................................2. 2. Posterolateral angles of pronotum widely rounded, body covered with long and dense setae...... M. velutinus ( Solier, 1849 ) -. Posterior angles of pronotum well marked, obtuse to right-angled, setation of body shorter and not so dense [a group of species distinguishable only on the basis of genitalia]...............................................................3. 3. Apices of processes of trigonium widened, armed with denticles on inner sides; anterior portion of bursal sclerite subtrapezoidal............................................................................... M. valdivianus sp. nov. -. Apices of processes of trigonium gradually narrowing; posterior portion of bursal sclerite different....................4. 4. Each process of trigonium with ca. 15 denticles on its outer margin [females unknown]............ M. patagonicus sp. nov. -. Each process of trigonium with ca. 30 denticles on its outer margin; anterior portion of bursal sclerite transversely oval..................................................................................... M. enigmaticus sp. nov.