Additional information (Wiki):

Like other orders of the Ostariophysi, the cypriniformes possess a Weberian apparatus. However, they differ from most of their relatives in having only a dorsal fin on their back; most other Ostariophysi have a small fleshy adipose fin behind the dorsal fin. Further differences are the Cypriniformes' kinethmoid and the lack of teeth in the mouth. Instead, they have convergent structures called pharyngeal teeth in the throat. While other groups of fish, such as cichlids, also possess pharyngeal teeth, the cypriniformes' teeth grind against a chewing pad on the base of the skull, instead of an upper pharyngeal jaw.