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  1. Straalvinnigen - Wikipedia

  2. Fish - Actinopterygii, Ray-Finned, Aquatic | Britannica

  3. Actinopterygii - New World Encyclopedia

  4. Actinopterygii | fish taxon | Britannica

    WEBThe Actinopterygii, or ray-finned fishes, are the largest class of fishes. In existence for about 400 million years, since the Early Devonian, it consists of some 42 orders containing more than 480 families, at least 80 of …

  5. ADW: Actinopterygii: INFORMATION

    WEBGe­o­graphic Range. Ray-finned fishes in­habit a va­ri­ety of ex­treme en­vi­ron­ments. These in­clude high al­ti­tude lakes and streams, desert springs (e.g. pup­fishes ), sub­ter­ranean caves (e.g. cave­fishes ), …