Definition: The term "Actinopterygii" refers to a group of species in the class Actinopodinae, which includes animals that are members of the clade Actinopteridia. A "actinopterygian" is an animal that has internal organs and excretory structures similar to those found in vertebrates. These animals include insects (such as mosquitoes), flies, worms, and small fish like tadpoles and water fleas. The word "Actinopterygii" may refer specifically to a group of these animals or the broader class Actinopteridia. If it refers specifically to an actinopterygian organism, then the term would likely be used in a scientific context to describe a certain type of animal. If the word is commonly used for a broad category of animals, then it could refer to the entire group of all actinopterygians. In that case, "Actinopterygii" might have more specific meanings depending on which definitions are used.
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