Definition: Actinopterygii (plural: actinopterid) is a genus in the phylum Nematoda, which belongs to the class Nematobacteria. This genus includes many species of microfilaria that are part of the family Actinoporinae. The actinopterygii are characterized by the presence of an actin filament (the filamentous cilia), and a specialized nucleus with three lobes. They are usually sessile, but some can be attached to other organisms through their flagellum or motility organs like gill filaments. Definition: Actinopterygii is a genus in the phylum Nematoda, which belongs to the class Nematobacteria. The actin filament (the filamentous cilia) and the specialized nucleus with three lobes are characteristic traits of these organisms.
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