Deuterodon
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Deuterodon iguape , the type species of the genus |
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| Deuterodon | ||||||||||||
| Eigenmann , 1907 |
The genus Deuterodon belongs to the real tetras (Characidae) and consists of nine species. Most of the species of the genus occur in southeastern Brazil, Deuterodon potaroensis lives in the Potaro river basin in Guyana .
features
Deuterodon species reach standard lengths of 6 to 12.5 cm and are similar to the species of the genera Astyanax and Jupiaba . They show a comma-shaped spot on the “shoulder”. Spots on the scales form horizontal longitudinal rows. One of them coincides with the sideline , which is formed by 37 to 40 scales. A dark spot on the caudal peduncle extends to the caudal fin. The anal fin is supported by 24 to 25 fin rays. Males of the species living in southeastern Brazil are said to develop a spawning rash on the anal fin during the breeding season .
Deuterodon species feed primarily on plants and have multi-pointed, flat teeth that form a continuous cutting edge. While in Astyanax and most other real tetras the front 4 to 5 teeth are significantly larger than the rest, in Deuterodon the tooth size decreases continuously from front to back. There are three to five teeth on the maxillary . The widest of these teeth has 5 to 7 tips. In contrast to most of the other true tetras , in Deuterodon the edge of the maxillary and its dentate area are not parallel to each other.
species
According to the Fishbase database , nine species belong to the genus Deuterodon .
- Deuterodon iguape Eigenmann, 1907
- Deuterodon langei Travassos, 1957
- Deuterodon longirostris (Steindachner, 1907)
- Deuterodon parahybae Eigenmann, 1908
- Deuterodon potaroensis Eigenmann, 1909
- Deuterodon rosae (Steindachner, 1908)
- Deuterodon singularis Lucena & Lucena, 1992
- Deuterodon stigmaturus (Gomes, 1947)
- Deuterodon supparis Lucena & Lucena, 1992
In a revision of the polyphyletic genus Astyanax published in April, 15 species were removed from Astyanax and placed under Deuterodon . These are:
- Deuterodon aphos (Zanata & Akama, 2004)
- Deuterodon burgerai (Zanata & Camelier, 2009)
- Deuterodon giton (Eigenmann, 1908)
- Deuterodon hamatilis (Camelier & Zanata, 2014)
- Deuterodon hastatus (Myers, 1928)
- Deuterodon heterostomus (Eigenmann, 1911)
- Deuterodon intermedius (Eigenmann, 1908)
- Deuterodon janeiroensis (Eigenmann, 1908)
- Deuterodon luetkenii (Boulenger, 1887)
- Deuterodon mutator (Eigenmann, 1909)
- Deuterodon oyakawai (Santos & Castro, 2014)
- Deuterodon pelecus (Bertaco & De Lucena, 2006)
- Deuterodon ribeirae (Eigenmann, 1911)
- Deuterodon sazimai (Santos & Castro, 2014)
- Deuterodon taeniatus (Jenyns, 1842)
supporting documents
- ↑ Deuterodon potaroensis on Fishbase.org (English)
- ↑ a b Peter van der Sleen, James S. Albert: Field Guide to the Fishes of the Amazon, Orinoco, and Guianas. 2017, University Press Group Ltd, ISBN 978-0691170749 , 133.
- ↑ Deuterodon on Fishbase.org (English)
- ↑ Terán, GE, Benitez, MF & Mirande, JM (2020): Opening the Trojan horse: phylogeny of Astyanax , two new genera and resurrection of Psalidodon (Teleostei: Characidae). Zoological Journal of the Linnean Society: zlaa019. April 2020. doi: 10.1093 / zoolinnean / zlaa019