Pronunciation: /əˈkænθəˌdaɪ/
noun Acanthodii - a class of extinct jawed fishes known from the Silurian to the Permian periods, characterized by spiny fin rays
A1 Acanthodii were ancient fish that lived during the Devonian period.
A2 The Acanthodii were characterized by their spiny fins and shark-like appearance.
B1 Scientists believe that the Acanthodii were one of the earliest jawed fish.
B2 Fossils of Acanthodii have been found in various parts of the world, providing valuable insights into their evolution.
C1 The extinction of the Acanthodii paved the way for the rise of modern fish species.
C2 Researchers continue to study the Acanthodii in order to better understand the early evolution of vertebrates.
formal The acanthodii are an extinct class of fish characterized by bony spines in their fins.
informal Have you ever heard of the acanthodii fish? They had bony spines in their fins.
slang Those acanthodii fish were like the punk rockers of the ancient seas with their spiky fins.
figurative Just like the acanthodii fish adapted to their environment, we too must adapt to survive in our ever-changing world.
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