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

