Rocio (genus)
| Rocio | ||||||||||||
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Black banded cichlid ( Rocio octofasciata ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Rocio | ||||||||||||
| Schmitter-Soto , 2007 |
Rocio is a genus of cichlid that occurs in Central America. It lives exclusively in rivers and lakes on the Caribbean side from the Mexican city of Veracruz in the north to Honduras in the south. The type species of the genus, which was only introduced in 2007 by the Mexican ichthyologist Juan Jacobo Schmitter-Soto, is the black-banded cichlid ( Rocio octofasciata ),known from aquaristics and considered to be very aggressive. The author of the first description named the genre after his wife Rocío.
features
Rocio species are 7 to a maximum of 25 cm long. In young fish, the body is approximately oval, similar to that of Archocentrus centrarchus . With increasing size it becomes more and more elongated and then resembles that of the Parachromis species. The lower jaw protrudes slightly. The lips do not narrow towards the middle of the mouth. In the upper jaw, the front teeth are much larger than the teeth on the sides of the jaw and are designed as fangs or conical. They are single-pointed or have a second point on the tongue side. In the lower jaw, the front teeth are smaller than their neighbors. The pelvic fins start behind the beginning of the dorsal fin. The caudal fin is spade-shaped or rounded. The genital papilla is oval and longer than it is wide. The sides of the body are patterned with eight rather indistinct horizontal stripes. The stripes do not extend over the dorsal and anal fin. The first horizontal stripe is Y-shaped, but this is only vaguely visible. The fourth stripe, sometimes the third, is thickened in the middle. There is an eye spot on the tail stalk above the sideline . The expression of the gill rake on the first gill arch and the features of two skull bones (mesethmoid and supraoccipital) are considered synapomorphies of the genus .
- Fins formula : Dorsal XVII – XIX / 8–11, anals (VI, VII) VIII – IX (X) / (6) 7–9, pectorals 14–16.
- Dandruff formula : 3.5–5.5 / 27–31.
- Gill rake 6–8 (9).
- Vertebrae 28-30.
species
Currently the genus Rocio consists of four species.
- Rocio gemmata Contreras-Balderas & Schmitter-Soto, 2007
- Rocio ocotal Contreras-Balderas & Schmitter-Soto, 2007
- Black-banded cichlid ( Rocio octofasciata (Regan, 1903) )
- Rocio spinosissima (Vaillant & Pellegrin, 1902)
literature
- Juan J. Schmitter-Soto (2007): A systematic revision of the genus Archocentrus (Perciformes: Cichlidae), with the description of two new genera and six new species. Zootaxa No. 1603: 1-76.
Individual evidence
- ↑ Říčan, O., Piálek, L., Dragová, K. & Novák, J. (2016): Diversity and evolution of the Middle American cichlid fishes (Teleostei: Cichlidae) with revised classification . Vertebrate Zoology, 66 (1): 1-102.
Web links
- Rocio on Fishbase.org (English)