- Bell-shaped
- Transparent gelatinous cube in appearance
- Typically between 2 to 4 cm (0.8 to 1.6 in) across
- Some species can exceed 40 cm (16 in)
Tentacles:
- Up to 6 feet long (1.8m) when stretched out fully but contracted when stationary (about 6 to 24 inches, but typically about 12 inches long )
- Up to 50 of them hanging from each corner of the box body - 4 thick primary tentacles; up to 46 smaller tentacles around these thicker ones