Dichotomous Key/Octopoda

< Dichotomous Key

Dichotomous Key
Octopoda
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Coleoidea
Superorder	Octopodiformes
Order	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

This article is issued from Wikibooks. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.