Fishes of the Northeastern Atlantic and Mediterranean
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Fishes of the Northeastern Atlantic and Mediterranean
Key: Step 2

2a. Five to seven pairs of gills, each gill with separate external opening; no common operculum-like cover (Elasmobranchii).

Step 3

2b. Four pairs of gills, with one combined external opening on each side of head; opening covered by an operculum-like fold of skin.

Step 4
Decision path