| Acheilognathus rhombeus | |
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Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Cypriniformes |
| Family: | Cyprinidae |
| Subfamily: | Acheilognathinae |
| Genus: | Acheilognathus |
| Species: | A. rhombeus |
| Binomial name | |
| Acheilognathus rhombeus (Temminck & Schlegel, 1846) | |
| Synonyms | |
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Acheilognathus rhombeus is a temperate freshwater fish belonging to the Acheilognathinae sub-family of the family Cyprinidae. It originates in Japan and the Korean Peninsula. It was originally described as Capoeta rhombea by Temminck & Schlegel in 1846. It is the type species for the Acheilognathus genus.
Fish are gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods. Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology, unless it is used in the cladistic sense, including tetrapods. The traditional term pisces is considered a typological, but not a phylogenetic classification.
The bitterling-like cyprinids form the cyprinid subfamily Acheilognathinae. This subfamily contains four genera, although the Khanka spiny bitterling is often placed in Acheilognathus, and at least 71 described species to date. Over half of the species are in the genus Acheilognathus.
The Cyprinidae are the family of freshwater fishes, collectively called cyprinids, that includes the carps, the true minnows, and their relatives. Also commonly called the "carp family", or "minnow family", Cyprinidae is the largest and most diverse known fish family and the largest vertebrate animal family in general, with about 3,000 living and extinct species but only 1,270 remain extant. They range from about 12 mm to 3meters Catlocarpio siamensis. This certain family of fish is one of the only that do not take care of their eggs. In about 370 genera. The family belongs to the ostariophysian order Cypriniformes, of whose genera and species the cyprinids make more than two-thirds. The family name is derived from the Ancient Greek kyprînos.
When spawning, the females deposit their eggs inside bivalves, where they hatch and the young remain until they can swim.
