Tetragonopterus
Creators: name: Silva, Gabriel S. C.
name: Melo, Bruno F.
name: Oliveira, Claudio
name: Benine, Ricardo C.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Anthribidae
Tetragonopterus

description: Key to the species of Tetragonopterus
1. Eleven to 17 predorsal scales (Amazon, La Plata, Orinoco, Essequibo, Parnaíba and Jaguaribe rivers).................................................................................................... Tetragonopterus argenteus
1’. Seven to 9 predorsal scales...............................................................................2
2. Lozenge-shaped dark blotch on caudal peduncle (Rio Jari)................................. Tetragonopterus carvalhoi
2’. Rounded or oval-shaped dark blotch on caudal peduncle.......................................................3
3. Three and a half scale rows between lateral line and pelvic-fin origin.............................................5
3’. Four and a half to 5.5 scale rows between lateral line and pelvic-fin origin........................................4
4. Presence of longitudinal dark stripes on the lateral surface of the body (Corantijn and Marowijne basins, Rio Jari and Rio Paru)................................................................................... Tetragonopterus rarus
4’. Absence of longitudinal dark stripes on the lateral surface of the body (Essequibo, Marowijne, Oyapock and Paru rivers)..................................................................................... Tetragonopterus georgiae
5. Seventeen to 20 gill-rakers on the lower limb of the first gill arch................................................ 6
5’. Eleven to 15 gill-rakers on the lower limb of the first gill arch..................................................7
6. Subsuperior mouth, 5–6 thin teeth on dentary, 2–4 teeth on the maxilla (Tocantins-Araguaia system).................................................................................................... Tetragonopterus anostomus
6’. Terminal mouth, 4 robust teeth on dentary, 0–2 teeth on the maxilla (Rio Araguaia).......... Tetragonopterus araguaiensis
7. Five to 6 thin and sharp teeth on dentary....................................................................8
7’. Four relatively robust teeth on dentary.....................................................................10
8. Seven scale rows between dorsal-fin origin and lateral line (Tocantins-Araguaia system)....... Tetragonopterus denticulatus
8’. Six scale rows between dorsal-fin origin and lateral line.......................................................9
9. Two conspicuous humeral marks (upper Rio Tapajós)...................................... Tetragonopterus juruena
9’. A single conspicuous humeral mark (Rio Xingu).................................... .. Tetragonopterus kuluene sp. n.
10. Up to 6 teeth on maxilla............................................................................... 11
10’. Seven to 8 teeth on maxilla (middle Rio Tapajós).................................... Tetragonopterus ommatus sp. n.
11. Eleven to 17 olfactory lamellae, 4 thin teeth on dentary (São Francisco, Paraguaçu and Itapicuru rivers of northeastern Brazil)........................................................................ Tetragonopterus franciscoensis sp. n.
11’. Eighteen to 40 olfactory lamellae, 4 robust teeth on dentary (Amazon, Orinoco and Guianas)...... Tetragonopterus chalceus
description: Published as part of Silva, Gabriel S. C., Melo, Bruno F., Oliveira, Claudio & Benine, Ricardo C., 2016, Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species, pp. 1-46 in Zootaxa 4200 (1) on pages 10-11, DOI: 10.11646/zootaxa.4200.1.1, http://zenodo.org/record/177598