Riethia Kieffer 1917
Creators: name: Andersen, Trond
name: Malla, Annui
name: Giłka, Wojciech
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Riethia

description: Updated key to Neotropical males of Riethia
1. Posterior margin of tergite IX with caudal projections resembling an inverted U (Brazil)........................................................................................ .. R. fazzari Trivinho-Strixino & Shimabukuro, 2018
- Posterior margin of tergite IX straight or rounded, without caudal projections..................................... 2
2. Superior volsella short, hook-like; inferior volsella subtriangular, tapering to narrowly rounded apex; with few, scattered, flattened, apically pectinate dorsal setae and 2–3 marginal scales apically (Brazil)............................................................................................... R. galilei Trivinho-Strixino & Shimabukuro, 2018
- Superior volsella long, curved or with distal half straight, digitiform; inferior volsella not subtriangular and tapering to narrowly rounded apex, with or without flattened, apically pectinate dorsal setae and/or marginal scales........................ 3
3. Inferior volsella strongly bent dorsally with apical part bluntly subtriangular with more than 20 broad flattened, apically pectinate setae covering dorsal surface, without marginal scales................................................ 4
- Inferior volsella not strongly bent dorsally, with marginal scales; without or with less than 20 broad flattened, apically pectinate setae............................................................................................... 6
4. Legs with dark bands; superior volsella curved, digitiform, apically pointed with microtrichia and apparently 2 weak, dorsal setae subapically (Argentina, Brazil, Chile)................................... R. truncatocaudata (Edwards, 1931)
- Legs without dark bands; superior volsella curved, stout, with long, narrowly triangular apex, with or without microtrichia, with 5–7 weak, dorsal setae................................................................................. 5
5. Abdomen brown, without dark bands; superior volsella with scattered microtrichia (Ecuador)..... R. ecuadoriensis sp. nov.
- Abdomen light brown, tergites with darker brown oral bands; superior volsella without microtrichia (Chile)................................................................................................. R. chilensis sp. nov.
6. Superior volsella with distal half straight; inferior volsella with about 10 broad scales in double row along inner margin, without broad, flattened, apically pectinate setae (Costa Rica) ......................... R. epleri Andersen & Sanz-laParra, 2023
- Superior volsella curved; inferior volsella with both marginal scales and broad, flattened, apically pectinate setae......... 7
7. Acrostichals absent; clypeus with less than 10 setae (Brazil)........... R. cauame Trivinho-Strixino & Shimabukuro, 2018
- Acrostichals present; clypeus with more than 25 setae........................................................ 8
8. Inferior volsella with 15 broad, flattened, apically pectinate setae dorsally and 3 broad marginal scales apically (Brazil)............................................................. R. manauara Neubern, Trivinho-Strixino & Silva, 2011
- Inferior volsella with 6 broad flattened, apically pectinate setae dorsally and 7 broad marginal scales apically (Brazil).................................................................. R. pantera Trivinho-Strixino & Shimabukuro, 2018
description: Published as part of Andersen, Trond, Malla, Annui & Giłka, Wojciech, 2024, Two new species of Riethia Kieffer, 1917 from Chile and Ecuador (Chironomidae: Chironominae, Pseudochironomini), pp. 499-507 in Zootaxa 5448 (4) on pages 505-506, DOI: 10.11646/zootaxa.5448.4.3, http://zenodo.org/record/11232202