Anablepidae
| Anablepidae | ||||||||||||
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Four eyes ( anableps ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Anablepidae | ||||||||||||
| Bonaparte , 1831 |
The Anablepidae are a family of fish from the order of the toothfish (Cyprinodontiformes). They live in fresh and brackish water , less often in the coastal seas in Central and South America . They include the well-known four eyes ( Anableps ), whose eyes are divided into two halves with a pupil each by a transverse septum, so that the animals can see above and below water at the same time.
features
The fish are 2.5 to 32 centimeters long. Your body is stretched, your back is flattened. The pelvic fins are far back, well behind the end of the pectoral fins . The pelvic girdle sits low on the sides, the pelvic rays point downwards or backwards. The dorsal fin is located far back, behind the anal fin .
Way of life
The species of the Anablepidae live on the surface of their living waters. They feed on approach food (insects that have fallen into the water), mosquito larvae and small crustaceans. The four- eyes and the line parsons are viviparous , while the white-eyed fish lays eggs. The sex organ ( gonopodium ) formed from the anal fin of the male quadrupeds and line parsons can only be moved to the right or left. Correspondingly, there are females whose genitals open to the left or right. Males with a left-turning gonopodium can only reproduce with females whose genitals point to the right, and vice versa.
Systematics
There are two subfamilies, three quite different genera and 18 species.
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- Subfamily Anablepinae Bonaparte, 1831
- Genus Vieraugen ( Anableps ) Scopoli, 1777
- Genus line marmosets ( Jenynsia ) Günther, 1866
- Subfamily Oxyzygonectinae Parenti, 1981
- Genus white-eyed fish Oxyzygonectes Fowler, 1916
The fossil fish genus Carionellus from the Miocene of Ecuador is possibly an extinct Anablepidae.
literature
- Nelson, JS (2006): Fishes of the World. John Wiley & Sons, ISBN 0-471-25031-7 .
Web links
- Anablepidae on Fishbase.org (English)