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Sabella pavonina

Summary

Sabella pavonina, commonly known as the peacock worm, is a marine polychaete worm belonging to the family Sabellidae. They can be found along the coasts of Western Europe and the Mediterranean. It is found in shallow, tidal waters with a bed of mud, sand or gravel. It is sometimes found on rocks or shipwrecks.[1]

Sabella pavonina
Peacock worms (Sabella pavonina) with short-snouted seahorse, Porto Cesareo, Italy
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Clade: Sedentaria
Order: Sabellida
Family: Sabellidae
Genus: Sabella
Species:
S. pavonina
Binomial name
Sabella pavonina
Savigny, 1820
Peacock worm in the Sound of Mull

It is 10–25 centimetres in length. Its body is elongated and divided into 100–600 small segments. The head has two fans of 8–45 feathery radioles arising from fleshy, semi-circular lobes. The body is mostly grey-green while the radioles are brown, red or purple with darker bands.[2]

The worm lives inside a smooth tube of fine mud or sand particles held together with mucus. The tube stands upright with the lower end attached to stones and the upper end protruding from the sea bed. When covered by water, the worm extends its crown out of the tube to feed, using cilia on the radioles to circulate water through the crown. Small food particles are carried down the radioles to the mouth of the worm, while larger particles are rejected, or cemented with mucus to extend the length of the tube.[3] The crown is highly sensitive to light and pressure and quickly retracts in response to motion or shadow.[3][4]

Sabella pavonina and other Sabellid worms experience heavy predation by bottom-feeding fish, but are capable of regenerating even when a large part of the tube and the worm inside have been bitten off.[5][6]

References edit

  1. ^ Wells, G. P. (1951). "On the Behaviour of Sabella". Proceedings of the Royal Society of London. Series B: Biological Sciences. 138 (891): 278–299. JSTOR 82543.
  2. ^ Fish, J. D. (2012). A Student’s Guide to the Seashore. Springer. pp. 172–173. ISBN 978-94-011-5888-6.
  3. ^ a b Hayward, Peter J. (2004). A Natural History of the Seashore. Collins. pp. 52–53.
  4. ^ Harris, Vernon (1990). Sessile Animals of the Sea Shore. Chapman and Hall. p. 117.
  5. ^ Berrill, N. J. (1977). "Functional Morphology and Development of Segmental Inversion in Sabellid Polychaetes". Biological Bulletin. 153 (3): 453–467, at 463. JSTOR 1540600.
  6. ^ Wells, G. P. (1952). "The Respiratory Significance of the Crown in the Polychaete Worms Sabella and Myxicola". Proceedings of the Royal Society of London. Series B: Biological Sciences. 140 (898): 70–82, at 75. JSTOR 82713.

External links edit

  • Peacock worm at Marine Life Information Network
  • ARKive - images and video
  • Photos of Sabella pavonina on Sealife Collection