Identification key and pictures Hypostomus from rio Ivaí, upper rio Parana basin
Posted: 26 Mar 2018, 23:48
Dias, A. C., & Zawadzki, C. H. (2018). Identification key and pictures of the Hypostomus Lacépède, 1803 (Siluriformes, Loricariidae) from the rio Ivaí, upper rio Paraná basin. Check List, 14(2), 393-414.
https://doi.org/10.15560/14.2.393
https://checklist.pensoft.net/article/2 ... nload/pdf/
https://doi.org/10.15560/14.2.393
https://checklist.pensoft.net/article/2 ... nload/pdf/
Dias & Zawadzki wrote:ABSTRACT
The rio Ivaí flows through the left margin of the upper rio Paraná basin with 798 km of extension, being one of its largest tributaries. In this study, we analyzed 586 specimens of Lacépède, 1803 from the rio Ivaí basin deposited in the Coleção de Peixes do Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura da Universidade Estadual de Maringá (NUP) and Coleção Ictiológica do Grupo de Pesquisas em Limnologia e Recursos Pesqueiros (CIG). Herein, 14 species of Hypostomus were recorded from the rio Ivaí basin (10 already described and 4 possible new). The most representative species was H. ancistroides, corresponding to 23.5% of all the specimens, followed by Hypostomus sp. 3, with 15.2%, and Hypostomus sp. 2, with 13.8%. Considering Hypostomus, this study suggests that the rio Ivaí has high species richness compared with adjacent basins, such as rio Paranapanema, rio Tibagi, rio Piquiri and rio Iguaçu. Knowing the difficulties founded by many ichthyologists and researchers in identifying species within this genus, we also present here an identification key for its species present in the rio Ivaí basin.
- Key words: Armored catfishes; hypostominae; teleostei; Neotropical fishes; taxonomy; check list; diversity; ichthyofauna
- Body without spots, dorsal and caudal fins with inconspicuous spots ... sp. 1, Fig. 13 (in article)
- Body with spots, dorsal and caudal fins with conspicuous spots or vermiculated ... 2
- Body with vermiculated blotches ... sp. 3, Fig. 15 (in article)
- Body with roundish spots ... 3
- Body with light spots ... 4
- Body with dark spots ... 9
- Pectoral-fin spine equal to or smaller than pelvic-fin spine length ... , Fig. 3
- Pectoral-fin spine longer than pelvic-fin spine length ... 5
- Premaxilla with 15–21 teeth; 13–23 teeth in dentary ... , Fig. 8
- Premaxilla with >21 teeth; more than 23 teeth in dentary ... 6
- Caudal fin truncated ... Hypostomus aff. paulinus, Fig. 9
- Caudal fin notched ... 7
- Dentary with 49–57 teeth ... , Fig. 11
Dentary with >60 teeth ... 8
- Dentary with 49–57 teeth ... , Fig. 11
- Premaxilla with 92–99 teeth; 93–106 teeth in dentary; dentary width 19.1–21.3% of head length ... , Fig. 10
- Premaxilla with 65–89 teeth; 63–91 teeth in dentary; dentary width 21.5–28.1% of head length ... sp. 2, Fig. 14 (in article)
- Body with keel in lateral series of plates ... 10
- Body without keel in lateral series of plates ... 12
- Length of dorsal-fin spine 37.9–42.5% of standard length; length of base of dorsal fin 27.1–27.8% of standard length ... , Fig. 5
- Length of dorsal fin less than 37% in standard length; length of base of dorsal fin <27% in standard length ... 11
- Body spots of similar size to the pupil diameter; superior orbital margin not raised; orbital diameter 12–17.9% of head length ... , Fig. 4
- Body spots larger than the pupil diameter; raised superior orbital margin; orbital diameter 20.0–21.5% of head length ... , Fig. 7
- Small eyes, orbital diameter 13.5–21.8% in head length; spots on head and body with same size ... sp. 4, Fig. 16 (in article)
- Big eyes, orbital diameter bigger than 21% of head length; head spots smaller than body spots ... 13
- Abdomen covered by bony plates; cleithral width 30.7–34.0% of standard length ... , Fig. 6
- Naked abdomen or with few central plates; cleithral width 29.1–30.9% of standard length ... , Fig. 12
