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Larger Tube-Building Fauna (Biotic Group)

Component: Biotic

Unique Identifier: 538

Biotic Setting Benthic/Attached Biota
Biotic Class Faunal Bed
Biotic Subclass Soft Sediment Fauna
Biotic Group Larger Tube-Building Fauna
Biotic Community Robust Ampelisca Bed
Asabellides Bed
Asychis Bed
Chaetopterus Bed
Diopatra Bed
Lagis Bed
Loimia Bed
Phoronopsis Bed
Phoronid Bed


Description
Definition Soft sediment areas dominated by larger tube builders (tube width > 2 millimeters, or tube length > 30 millimeters), most commonly polychaetes, but including many other worm-like phyla (phoronids, sipunculids), crustaceans, and others. The tubes may be constructed in a variety of ways to produce calcareous, leathery, sandy, mucus-bound, chitinous, fibrous, papery, and other types of tubes. The animal itself may reside above or below the sediment surface, within the constructed tube. Some tube-building species (e.g., Asabellides oculata) may form extremely dense mounds of tubes that rise many centimeters above the seafloor. If colonization and growth of these fauna and their tubes results in the construction of substrate that is relatively stable, these faunal structures may be classified as Reef Biota.