411 REFERENCE · Wikibooks
Dichotomous Key/Octopoda
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Octopoda Animalia Mollusca Cephalopoda Coleoidea Octopodiformes Octopoda
1
Cornea
Present - 2
Not present - 3
2: Incirrata
Detachable hectocotylus
Present - 5
Not present - 6
3: Cirrata
Secondary web
Present - 4
Not present - ../Opisthoteuthidae/
4
Shell shape
Saddle-shaped - ../Cirroteuthidae/
U-shaped - ../Stauroteuthidae/
5: Argonautoida
Tissue consistency
Gelatinous - 10
Muscular - 9
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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