Dichotomous Key/Oegopsida
Oegopsida | |
---|---|
Kingdom | Animalia |
Phylum | Mollusca |
Class | Cephalopoda |
Subclass | Coleoidea |
Order | Oegopsida |
Information related to Oegopsida Wikipedia • Wikispecies • Wikicommons | |
1
2
- Funnel locking-cartilage
- Straight - 4
- Inverted T - Ommastrephidae
3
4
5
6: Histioteuthids
- Comparative eye size
- Equal - wikipedia:en:Psychroteuthis glacialis
- Unequal, left eye larger - Histioteuthidae
7: Enoploteuthids
8
- Free posterior fin lobes
- Present - Neoteuthidae
- Not present - Architeuthidae
9
- Photophores on eyeballs
- Present - 11
- Not present - wikipedia:en:Ancistrocheirus lesueurii
10
- Hooks on arm pairs I - III
- Present - Pyroteuthidae
- Not present - Lycoteuthidae
11
- Photophores on mantle
- Present - Enoploteuthidae
- Not present - Pyroteuthidae
12
Brachioteuthidae
Cranchiidae
Gonatidae
Cycloteuthidae
Onychoteuthidae
Thysanoteuthidae
13
14: Chiroteuthids
15
- Proximal region of manus of club greatly expanded
- Present - Brachioteuthidae
- Not present - 16
16: Lepidoteuthids
- Tentacles
- Absent or reduced in adults - 17
- Present - Pholidoteuthidae
17
- Number of hooks
- Two or fewer - wikipedia:en:Lepidoteuthis grimaldii
- Many, in two series - Octopoteuthidae
18
- Doratopsis paralarva
- Present - Chiroteuthidae
- Not present - 19
19
- Shape of distal ends of tentacles
- Vermiform - wikipedia:en:Magnapinna pacifica
- Other - 21
20
- Comparative arm length
- All arms comparable - wikipedia:en:Batoteuthis skolops
- Arm pairs I - III much longer than others - wikipedia:en:Joubiniteuthis portieri
21
- Ink sac
- Present - Mastigoteuthidae
- Not present - Promachoteuthidae