To this point we shall recur; palaeontology, though it suggests a clue, does not furnish an actual link either between Echinoidea and Asteroidea, or between those classes and Pelmatozoa.
The starfish, brittle-stars and their allies (see Starfish) have for the last fifty years usually been divided into two classes - Asteroidea and Ophiuroidea, each equivalent to the Holothurioidea or Echinoidea.
Echinoidea הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד