Odontosyllis enopla

Odontosyllis enopla, commonly known as the Bermuda fireworm, is a polychaete worm that inhabits shallow areas of the western Atlantic Ocean. The organism is bioluminescent when it rises to the surface of the sea during its mating period. It is possible that this fireworm is the explanation of a candle-like light seen by Christopher Columbus during his first voyage on 11 October 1492 before he made landfall in his explorations.[2]

Odontosyllis enopla
Scientific classification
Kingdom:
Animalia
Phylum:
Annelida
Class:
Polychaeta
Order:
Errantia
Family:
Syllidae
Genus:
Odontosyllis
Species:
O. enopla
Binomial name
Odontosyllis enopla
Verrill, 1900 [1]
Synonyms[1]
  • Autolytus bidens Treadwell, 1941

Description

As a polychaete worm, Odontosyllis enopla has a body consisting of multiple segments each with a pair of parapodia. The head has two pairs of eyes at the sides with several advanced features including a lens, photoreceptor cells, a retina and pigment granules. Associated with these are linear arrays of tubes which may function in a similar way to fibre optic bundles.[3] Each pair of eyes is oriented in a different plane. Female worms grow to 20 mm (0.8 in) or longer while males typically grow to 12 mm (0.5 in). This worm normally lives in a mucous tube on the shallow seabed.[4]

Distribution

O. enopla is native to Bermuda, the Bahamas, the southeastern Atlantic coast of the USA (Georgia, Florida and Texas), the West Indies, the Caribbean Sea and the Gulf of Mexico.[1] Odontosyllis phosphorea is a similar species found in the eastern Pacific Ocean.[5]

Behaviour

This small worm is normally inconspicuous, dwelling inside its tube concealed among corals and algae on the seabed,[4] however in the breeding season it changes its behaviour. Reproduction takes place in the summer, two to five days after the full moon; in the early night, female worms leave their tubes and rise to the surface. The timing of their ascent is very precise, taking place exactly 55 minutes after sunset.[6] On the surface, they swim in tight circles, secreting mucus along the length of their bodies which emits flashes of bluish-green light.[2] The female worms are soon joined by males, also emitting flashes of light, and they gyrate together, releasing gametes into the water. After ten to fifteen minutes the spawning period is over and light emission ceases, the worms swim to the bottom, discard their swimming setae (bristles) and build themselves new tubes.[2] The bioluminescence indicates to the male the spot at which a female is releasing its eggs, and the complex eye mechanism enables the male to accurately locate the position. Tests of water samples taken from the surrounding area show that 45 to 80% of the eggs are successfully fertilised by this reproductive strategy.[5]

See also

References
  1. WoRMS (2015). "Odontosyllis enopla Verrill, 1900". WoRMS. World Register of Marine Species. Retrieved 30 December 2015.
  2. Shimomura, Osamu (2012). Bioluminescence: Chemical Principles and Methods. World Scientific. pp. 234–237. ISBN 978-981-4366-08-3.
  3. Wolken, Jerome J.; Florida, Robert G. (1984). "The eye structure of the bioluminescent fireworm of Bermuda, Odontosyllis enopla". Biological Bulletin. 166 (1): 260–268. doi:10.2307/1541447.
  4. Scott, Emily. "Bermuda Fireworm (Odontosyllis enopla)". Marine vertebrates of Bermuda. Retrieved 30 December 2015.
  5. Metzler, Isaac; Groh, Jasmes (2013). "Odontosyllis phosphorea: Life cycle". The benthic glow. University of Wisconsin. Retrieved 30 December 2015.
  6. Dorresteijn, Adriaan W.C.; Westheide. Wilfried (2013). Reproductive Strategies and Developmental Patterns in Annelids. Springer Science & Business Media. p. 48. ISBN 978-94-017-2887-4.
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