Seanet Mid Intertidal

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Anthopleura xanthogrammica (Brandt 1835)
Phylum Cnidaria, Class Anthozoa, Subcl. Zoantharia, Order Actiniaria, Family Actiniidae

Oral disc to 20 cm diameter, solid green or with faint radiating lines; tentacles uniform green. Warts (verrucae) on brown column not obviously in longitudinal rows; usually lacks heavy cover of shell debris on column.

Common, mid- to low intertidal zones, exposed outer coast, often just below mussel beds. Possess photosynthetic endosymbiotic zooxanthellae (a dinoflagellate).

Geo Range: Alaska to Baja
Synonyms: Cribrina xanthogrammica
Similar species:
Anthopleura sola is gray-green with distinct radiating lines on oral disc; its column is more completely covered with shell debris & verrucae are arranged in rows down length of column.