Scirtidae Fleming 1821
Creators: name: Ruta, Rafał
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scirtidae

description: 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
description: Published as part of Ruta, Rafał, 2021, Three new genera of large marsh beetles (Coleoptera: Scirtidae) from Valdivian temperate rain forests of southern South America, pp. 451-485 in Zootaxa 5048 (4) on page 481, DOI: 10.11646/zootaxa.5048.4.1, http://zenodo.org/record/5556650