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Researchers describe 4 new species of 'killer sponges' from the deep sea
Date:4/14/2014

nusAsbestopluma. One of these, Asbestopluma monticola was first collected from the top of Davidson Seamount, an extinct underwater volcano off the Central California coast (monticola means "mountain-dweller" in Latin).

A second new species, Asbestopluma rickettsi, was named after marine biologist Ed Ricketts, who was immortalized in John Steinbeck's book, Cannery Row. This sponge was observed at two locations offshore of Southern California. At one of these spots, the sponge was living near colonies of clams and tubeworms that use bacteria to obtain nutrition from methane (natural gas) seeping out of the seafloor. Although A. rickettsi has spines, the researchers did not see any animals trapped on the specimens they collected. Ongoing research suggests that this sponge, like its "chemosynthetic" neighbors, can use methane-loving bacteria as a food source.

The third and fourth new species of carnivorous sponges were also observed near communities of chemosynthetic animals. However these communities were associated with deep-sea hydrothermal vents, where plumes of hot, mineral-rich water flow out of the seafloor.

One new species, Cladorhiza caillieti, was found on recent lava flows along the Juan de Fuca Ridge, a volcanic ridge offshore of Vancouver Island. The fourth sponge, Cladorhiza evae, was discovered far to the south, in a newly discovered hydrothermal vent field on the Alarcon Rise, off the tip of Baja California. Specimens of both these sponges had numerous prey trapped among their spines.

Although it's clear that the sponges with trapped animals were consuming their crustacean prey, the authors are looking forward to the day when they will actually get to see this process in action. Until then, horror-movie fans will have plenty to look forward toas Lundsten and his coauthors noted in their recent paper, "Numerous additional carnivorous sponges from the Northeast Pacific (which have been
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Contact: Kim Fulton-Bennett
kfb@mbari.org
831-775-1835
Monterey Bay Aquarium Research Institute
Source:Eurekalert  

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