Dichotomous Key/Oegopsida

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

1

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

2

  • Funnel locking-cartilage
    • Straight - 4
    • Inverted T - Ommastrephidae

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

  • Free posterior fin lobes
    • Present - Neoteuthidae
    • Not present - Architeuthidae

9

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

  • 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
    • Present - Brachioteuthidae
    • Not present - 16

16: Lepidoteuthids

  • Tentacles
    • Absent or reduced in adults - 17
    • Present - Pholidoteuthidae

17

18

  • Doratopsis paralarva
    • Present - Chiroteuthidae
    • Not present - 19

19

20

21

  • Ink sac
    • Present - Mastigoteuthidae
    • Not present - Promachoteuthidae
Last modified on 6 September 2009, at 22:50