| Crimson feather stars (Himenometra
magnipinna), also known as living fossils, are the oldest, most primitive echinoderms. Two types of crimson feather stars, fossil types and deep-sea types, have stalks that look like lilies. A third type, which lives in shallow waters, has stalks that look like ferny twigs, and thus are nicknamed "sea ferns."(Ching-Hua Wang) |
