Fodinichnia /ˌfɒdɪˈnɪkniə/ (singular fodinichnion) are trace fossils formed by deposit feeders as they excavate the sediment in search of food. They tend to have repeated patterns (e.g. Chondrites) or spreites (e.g. Rhizocorallium), the shape reflecting the systematic feeding strategy used by the organism as it scours the sediment. Deposit feeding often results in structures with no overlapping parts, as the deposit feeder optimises its nourishment intake by avoiding going over the same area more than once. This avoidance behavior is called phobotaxis.
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