Actinopterygious – Definition & Meaning

Actinopterygious is a term that is often used in the field of biology to describe a particular group of fish. This group includes all of the ray-finned fish, which are characterized by their bony rays that support their fins. In this article, we will explore the definition and meaning of actinopterygious, as well as its origins, associations, synonyms, and antonyms.


The term actinopterygious is derived from the Greek words “actinos,” meaning ray, and “pteryx,” meaning fin. It is used to describe any fish that has fins supported by bony rays, as opposed to fins supported by cartilage or other structures. This group includes over 30,000 species of fish, making it the largest group of vertebrates.


The actinopterygious fish first appeared in the fossil record during the Silurian period, approximately 440 million years ago. They evolved from earlier fish that had fins supported by cartilage or other structures. Over time, the bony rays that support their fins became more numerous and specialized, allowing these fish to swim more efficiently and effectively.

Meaning in different dictionaries

The term actinopterygious is not commonly used outside of the field of biology, so it may not appear in all dictionaries. However, in those that do include it, the definition is generally consistent with the one given above.


Actinopterygious fish are found in a wide range of aquatic environments, including freshwater, saltwater, and brackish water. They are also an important part of many ecosystems, serving as prey for larger fish and other predators. Some species of actinopterygious fish are also commercially important, both for food and for recreational fishing.


There are not many synonyms for the term actinopterygious, as it is a fairly specific term. However, some alternative terms that may be used include ray-finned fish, bony fish, or osteichthyans.


The antonyms of actinopterygious would be any fish that does not have fins supported by bony rays. This would include fish with fins supported by cartilage or other structures, such as sharks and rays.

The same root words

The root words of actinopterygious are “actinos,” meaning ray, and “pteryx,” meaning fin. These words can also be found in other scientific terms related to fish anatomy, such as “actinosts,” which are the bony rays that support the dorsal fin, and “pterotic,” which refers to a bone in the skull that supports the pectoral fin.

Example Sentences

  1. The actinopterygious fish in this lake are an important food source for many larger predators.
  2. The bony rays that support the fins of actinopterygious fish are highly specialized and efficient.
  3. Sharks and rays are not considered actinopterygious fish, as their fins are not supported by bony rays.
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