< Dichotomous Key
| Octopoda | |
|---|---|
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Coleoidea |
| Superorder | Octopodiformes |
| Order | Octopoda |
Information related to Octopoda Wikipedia • Wikispecies • Wikicommons | |
1
2: Incirrata
3: Cirrata
- Secondary web
- Present - 4
- Not present - Opisthoteuthidae
4
- Shell shape
- Saddle-shaped - Cirroteuthidae
- U-shaped - Stauroteuthidae
5: Argonautoida
6
- Eye shape
- Tubular - Amphitretidae
- Other - 7
7
- Eye shape
- Laterally compressed - Bolitaenidae
- Other - 8
8
- Eye shape
- Rectangular - Vitreledonella richardi
- Other - Octopodidae
9
- Web
- Absent or greatly reduced except in four dorsal arms - Tremoctopodidae
- Consistent - 11
10
- Web
- Absent or greatly reduced except in four dorsal arms - Tremoctopus gelatus
- Consistent - Haliphron atlanticus
11
- Funnel locking-apparatus
- Contains circular pit - Argonautidae
- Does not contain circular pit - Ocythoe tuberculata
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