Belongs within: Eumalacostraca. The Euphausiacea, krill, are reasonably sized (generally some centimetres long) pelagic, shrimp-like crustaceans. They are best known for their role in the marine ecosystem as food for larger animals, due to their habit of forming large swarms. Characters (from Ax 2000): Carapace fused to first eight thoracomeres, forming cephalothorax (lateral folds of… Continue reading Euphausiacea