Crustacea The body of a crustacean is composed of segments, which are grouped into three regions: the head, the thorax and the abdomen. Most crustaceans are free-living aquatic animals. Alona affinis Bosmina coregoni Bosmina longirostris Camptocercus rectirostris Daphnia cucullata Daphnia longispina Eurycercus lamellatus Eurycercus spec Mussel crab
A Planktonista's world 