Starfish Dissection - BIOLOGY JUNCTION Apr 21, 2017Starfish Dissection Introduction: Echinoderms are radially symmetrical animals that are only found in the sea (there are none on land or in fresh water). Echinoderms mean “spiny skin” in Greek. Many, but not all, echinoderms have spiny skin. There are over 6,000 species. Echinoderms usually have five appendages (arms or rays), but there Biology Starfish Dissection Worksheet Flashcards | Quizlet Start studying Biology Starfish Dissection Worksheet. Learn vocabulary, terms, and more with flashcards, games, and other study tools.