棘きょく魚ぎょ類るい

noun

acanthodians; spiny sharks

Refers to an extinct class of jawed fishes; used in paleontology and evolutionary biology contexts.

• 棘きょく魚ぎょ類るいは古こ生せい代だいに生せい息そくしていた魚さかなの一いち群ぐんです。

  Acanthodians are a group of fish that lived during the Paleozoic era.