< Dichotomous Key
| Cephalopoda | |
|---|---|
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
Information related to Cephalopoda Wikipedia • Wikispecies • Wikicommons | |
1
- External shell
- Present - Nautiloidea
- Not present - 2
2: Coleoidea
| Mollusca keys |
| Classes |
|---|
| Aplacophora | Bivalvia | Caudofoveata | Cephalopoda | Gastropoda | Monoplacophora | Polyplacophora | Scaphopoda |
3: Decapodiformes
4: Octopodiformes
- Photophores
- Present - Vampyroteuthis infernalis
- Not present - Octopoda
5
- Shell shape
- Horn-shaped - Spirula spirula
- Other or not present - 7
6: Sepioidea
- Cuttlebone
- Present - Sepiidae
- Not present - 8
7
8: Sepiolida
- Depressions on funnel locking-apparatus
- One - Sepiolidae
- Two, or apparatus fused - Sepiadariidae
9
- Adhesive organ on dorsal surface of mantle
- Present - Idiosepiidae
- Not present - Myopsida
10
11: Bathyteuthoida
- Buccal connectives attaching to border of arms IV
- Dorsal border of arms IV - Bathyteuthidae
- Ventral border of arms IV - Chtenopterygidae
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