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Dichotomous Key/Cephalopoda
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Cephalopoda Animalia Mollusca Cephalopoda
1
External shell
Present - ../Nautiloidea/
Not present - 2
2: Coleoidea
Modified (or lost) arm pair
Arm pair IV - 3
Arm pair II - 4
3: Decapodiformes
Cornea
Present - 6
Not present - 5
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
Gladius
Present - ../Oegopsida/
Not present - 10
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
Branchial canals in gills
Present - 11
Not present - 9
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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cs:Dichotomický klíč:Cephalopoda