No circulatory system, no true body cavity, has a nervous system. Many people are affected by these.
Musseled foot and three classes. Go through metamorphosis, covered with light producing organs called photophores.
Skeleton, post anal tail, and dorsal nerve cord. Dives up to 30 feet in the water to eat aquatic algae.
No tissue, filter feeder, sessile, asymmetrical. Grow 1.5 cm a year, have existed for 500 million years, and can live to be 2,000 years old.
Skeleton, post anal tail, and dorsal nerve cord. Contains enough toxin to kill 30 men.
Skeleton, post anal tail, and dorsal nerve cord. 12.65 meters long and weighs about 21.5 tons.
No circulatory sysytem, tubular digestive system, and radial symmetry. Fastest sea star, no brains, all actions are reflexes.
Skeleton, post anal tail, and dorsal nerve cord. Can swim up to 10 kpm.
Stinging tentacles, soft-bodied, 2 life stages. Swim horizontally, translucent.
Skeleton, post anal tail, and dorsal nerve cord. Use four pairs of sensory tentacles to find food.
Stinging tentacles, soft-bodied, 2 life stages. Feather like shape, branch like structures on body to sting prey.
Musseled foot and three classes. Third largest clam, needs a lot of light, and food is obtained through photosynthesis.