Dichotomous Key/Oegopsida

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Dichotomous Key
Oegopsida
Kingdom Animalia
Phylum Mollusca
Class Cephalopoda
Subclass Coleoidea
Order Oegopsida

1

  • Buccal connective to arms IV
    • Dorsal - 2
    • Ventral - 3

2

3

  • Carpal locking-apparatus
    • Present - 12
    • Not present - 13

4

  • Gladius conus
    • Present - 5
    • Not present - 6

5

  • Anterior fin attachment
    • Mantle - 8
    • Gladius - 7

6: Histioteuthids

7: Enoploteuthids

  • Hooks on tentacular clubs
    • Present - 9
    • Not present - 10

8

9

10

11

12

Brachioteuthidae

Cranchiidae

Gonatidae

Cycloteuthidae

Onychoteuthidae

Thysanoteuthidae

13

  • Secondary tentacular club
    • Present - 14
    • Not present - 15

14: Chiroteuthids

  • Number of series of suckers
    • Six (on at least one arm) - 20
    • Other than six (on any arm) - 18

15

  • Proximal region of manus of club greatly expanded

16: Lepidoteuthids

17

18

19

20

21