Category Nuances for null:

• large,
• pelagic,
• gelatinous,
• cryptic,
• delicate,
• larger,
• colonial,
• planktonic,
• modular,
• invertebrate,
• oceanic,

Simple Categories for null:

• animal,
• zooplankton,
• predator,
• organism,
• plankton,
• creature,
• invertebrate,
• prey,