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Guide to Aulacoseira islandica

(O.Müll.) Simonsen 1979

Aulacoseira Islandica Guide
Credit: David Burge, Mark Edlund
  1. Rows of mantle areolae straight
  2. Areolae round
  3. Separation spines short and narrow

Valve mantles with rows of straight areolae. Separation spines are short and narrow; linking spines are spathulate. Mantle height to diameter varies greatly across the size range. Valves vary greatly in appearance, depending on ambient silica concentration.