Eulalia viridis

Description

Eulalia viridis is a dorsally flattened, slender worm with up to 200 segments. It grows to a length of 15 cm and is mid-green or bright green in colour. The head bears five antennae, two eyes and four pairs of tentacular cirri; the eversible proboscis is cylindrical and dotted with rounded papillae. Each body segment has a pair of parapodia, and the cirri on these are long, thin and pointed. They project outwards, forming a fringe down each side of the body.

Distribution and habitat

Before the 1990s, E. viridis was thought to have a wide range in the northeastern Atlantic including the waters around the United Kingdom, but morphological and biochemical studies led to the southern populations being recognised as a separate species Eulalia clavigera, part of a species complex with E. viridis.

As now recognised, E. viridis is native to the northeastern Atlantic Ocean where it is found in the waters off Norway, Sweden, Denmark and Germany, as well as the Faroe Islands, Iceland and Disko Island at depths from the mid-shore down to about 150 m. It is typically found on rocky coasts and on shelly gravel, in rock crevices and mussel beds.

Biology

Although many worms in this family are predators and actively hunt prey, E. viridis seems to be more selective in its diet, and researchers found that it only consumed moribund or dead animal tissue. Breeding does not take place until the worms are at least two years old, and they are not thought to form swarms as do some other related species.

References

References

1. Linnaeus. (1767). "Systema naturae". Laurentii Salvii.
2. Geoffrey Read, Kristian Fauchald & Gérard Bellan. (2012). "''Eulalia viridis'' (Linnaeus, 1767)".
3. Brusca, R.C.; Brusca, G.J. (2003). Invertebrates. Sinauer Associates. Sunderland, Massachusetts.
4. Hayward, P.J.; Ryland, J.S. (1995). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. New York.
5. Pizzolla, P.F.. (2008). "Green-leaf worm: ''Eulalia viridis''". Plymouth: Marine Biological Association.
6. (2011). "A Student's Guide to the Seashore". Cambridge University Press.
7. de Kluijver, M.J.. "''Eulalia viridis''". Marine Species Identification Portal.
8. Australian Biological Resources Study. (2000). "Polychaetes & Allies: The Southern Synthesis". Csiro Publishing.