A worm-like tube-dwelling marine animal with a horseshoe-shaped ring of ciliated tentacles (lophophore) around the mouth, extended for filter-feeding.
- Phylum Phoronida
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- However, phoronids - or ‘horseshoe worms,’ as they are sometimes called - may be abundant in shallow marine sediments at certain localities.
- Feather duster worms, fan worms, Christmas tree worms and horseshoe worms are everywhere.
- The fauna of these sea caves includes a range of mollusc species such as limpets Patella spp. and the horseshoe worm Phoronis hippocrepia.