- Nasal style
- Nasal tube
- natatory
- natatory seta
- naupliar eye
- nauplius
- Neanic stage
- Neck
- neck shield
- nectophore
- nectosac
- nectosome
- nekton
- Nematocyst warts
- nematocysts
- Nematodesma
- Nematotheca
- Neoformation organelle
- neritic
- Neuropodium
- neuston
- Niche sensory
- Nidamental glands
- Nodal points
- Nodes
- Non-spinose
- Non-tentacular marginal bulb
- Nose
- nostril
- notal
- notch
- notochord
- notochord length
- Notopodium
- Nuchal
- Nuchal cartilage
- nuchal epaulettes
- Nuchal folds
- nuchal organ
- Nuchal papilla
- nuchal region
- nuchal slits
- Nuclear capsule
- nucleus
- nurse