Diurnal activity patterns in two sabellid fan worm species
Many animals have biological and circadian rhythms with periods of more and less activity. Fan worms (Polychaeta: Sabellidae) possess radiolar crowns used for feeding and respiration. These crowns can be retracted into the tube in which the animal lives, or displayed in the water, indicating inactivity or activity. Here, activity patterns based on crown status were studied in the fan worm species
