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'Globetrotting' new worms discovered on Great Barrier Reef and Swedish coast

Date:
March 8, 2010
Source:
University of Gothenburg
Summary:
Between the grains of sand on the sea floor there is an unknown and unexplored world. Scientists have just found new animal species on the Great Barrier Reef, in New Caledonia, and in the sea off the Gullmarsfjord in the Swedish county of Bohuslan.

The new species of Grania discovered off the Gullmarsfjord.
Credit: Pierre De Wit

Between the grains of sand on the sea floor there is an unknown and unexplored world. Pierre De Wit at Gothenburg University knows this well, and has found new animal species on the Great Barrier Reef, in New Caledonia, and in the sea off the Gullmarsfjord in the Swedish county of Bohuslän.

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The layer of sand on ocean floor is home to a large part of the vast diversity of marine species. Species representing almost all classes of marine animals live here. The genus Grania, which belongs to the class of annelid worms Clitellata, is one of them.

Grania the globetrotter

Grania is a worm around two centimetres in length and mostly white, which is encountered in marine sand throughout the world, from the tidal zone to deep down in the ocean. The researcher Pierre De Wit, at the Department of Zoology of the University of Gothenburg, is analysing exactly how many species of Grania there are and how they are related to other organisms.

Four new species

De Wit has conducted studies at the Great Barrier Reef in Australia, where he and his colleagues have found four entirely new species of the Grania worm. One of them is the beautifully green-coloured Grania colorata. "These worms are usually colourless or white, and we have not been able to work out why this particular species is green," says De Wit.

Separate history

De Wit has also found a previously unknown worm in Scandinavia, dubbed Grania occulta, which can only be distinguished from a previously known species by DNA. The worms' genetics show that the evolutionary history of the two species is in fact entirely separate, and that one of them is actually more closely related to a species that looks completely different.

Important knowledge

"Species that were previously regarded as the same may prove to have a completely different function in the ecosystem, and have different tolerance of environmental toxins, for example. It is obviously important to know this in order to be able to take the right action to protect our fauna," says de Wit.

The doctoral thesis Systematics of Grania (Clitellata: Enchytraeidae), an interstitial annelid taxon was publicly defended on 5 March 2010.


Story Source:

The above story is based on materials provided by University of Gothenburg. Note: Materials may be edited for content and length.


Cite This Page:

University of Gothenburg. "'Globetrotting' new worms discovered on Great Barrier Reef and Swedish coast." ScienceDaily. ScienceDaily, 8 March 2010. <www.sciencedaily.com/releases/2010/03/100308095836.htm>.
University of Gothenburg. (2010, March 8). 'Globetrotting' new worms discovered on Great Barrier Reef and Swedish coast. ScienceDaily. Retrieved March 29, 2015 from www.sciencedaily.com/releases/2010/03/100308095836.htm
University of Gothenburg. "'Globetrotting' new worms discovered on Great Barrier Reef and Swedish coast." ScienceDaily. www.sciencedaily.com/releases/2010/03/100308095836.htm (accessed March 29, 2015).

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