Fish Anatomy

noun A type of lobe-finned fish that includes the ancestors of land vertebrates

• The crossopterygian fish is known for its unique lobe fins.
• Have you ever heard of a crossopterygian fish? It's pretty cool.
• That crossopterygian fish is one funky-looking creature.
• Her ideas were like crossopterygian fossils, ancient yet still relevant.

adjective relating to or characteristic of the Acanthodei, an extinct group of jawed fish from the Paleozoic era

• The acanthodean fossils found in this region date back to the Devonian period.
• I heard that the acanthodean fish were the first to develop jaws in prehistoric times.
• Check out these cool acanthodean skeletons at the museum!
• His sharp wit was like an acanthodean spine, always ready to defend his arguments.