The hymenostomes are an order of ciliate protozoa. Most are free-living in freshwater, such as the commonly studied genus Tetrahymena, but some are parasitic on fish or aquatic invertebrates. Among these is the important species Ichthyophthirius multifiliis, a common cause of death in aquaria and fish farms.
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| - The hymenostomes are an order of ciliate protozoa. Most are free-living in freshwater, such as the commonly studied genus Tetrahymena, but some are parasitic on fish or aquatic invertebrates. Among these is the important species Ichthyophthirius multifiliis, a common cause of death in aquaria and fish farms. (en)
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| - Delage & Hérouard 1896 (en)
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| - Tetrahymena thermophila (en)
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| - Curimostomatidae (en)
- Glaucomidae (en)
- Ichthyopthiriidae (en)
- Ophryoglenidae (en)
- Suborder Ophryoglenina (en)
- Suborder Peniculina (en)
- Suborder Tetrahymenina (en)
- Tetrahymenidae (en)
- Turaniellidae (en)
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| - The hymenostomes are an order of ciliate protozoa. Most are free-living in freshwater, such as the commonly studied genus Tetrahymena, but some are parasitic on fish or aquatic invertebrates. Among these is the important species Ichthyophthirius multifiliis, a common cause of death in aquaria and fish farms. The hymenostomes are fairly typical members of the Oligohymenophorea. Their body cilia are mostly uniform, sometimes with a few long caudal cilia, and arise from monokinetids or from dikinetids at the anterior. The oral cilia are in general distinctly tetrahymenal, with three membranelles and a paroral membrane, which corresponds only to the middle segment of the tripartite membranes found in certain scuticociliates. Mouth formation during cell division usually begins next to a postoral kinety. The hymenostomes were first defined by Delage & Hérouard in 1896. Initially the scuticociliates and peniculids were included, then later treated as separate orders of a subclass Hymenostomatia, to which the astomes are sometimes added. More recently each of these groups tends to be treated as a separate subclass. (en)
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