Living reference work entry
Greek: cheilos = lip; ontos = tooth. English: skin dimmer.
There are described three species of this genus ( Chilodonella cyprini, C. uncinata, and C. hexasticha), which parasitize at the skin of a broad spectrum of fresh water fish including carps (Figs. 1 and 2). These ciliates measure about 80 × 40 μm, have a characteristic heart-like shape, and possess a different upper- and underside with respect to the formation of their rows of cilia. As other ciliates, these parasites possess two differently shaped nuclei (an ovoid macronucleus and a tiny micronucleus) and two pulsatory vacuoles. Characteristic is a ventral invagination leading to a "cell mouth" = cytopharynx. Reproduction occurs by a cross binary fission giving rise to new ciliates, while sexual processes (with exchange of genetic material) between two organisms take place during the process called conjugation. Under bad environmental conditions these ciliates may excrete a cyst wall, within which they may overcome these...
KeywordsCyst Wall Typical Symptom Small Fish Parasite Load Water Fish
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- Mehlhorn B et al (1992) Health for ornamental fish. Springer, HeidelbergGoogle Scholar
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