An exception to the rule that there are no marine insects

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A new study shows that lice do not remain on dry land when their seal-hosts go swimming. They cling on instead

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dry land. About 1m species have been described, more than twice as many as all other multicellular animal species, terrestrial and marine, put together. Several times that number are reckoned to await discovery. The oceans, though, are mostly insect-free. A few skate over the surface, but none dive willingly below the waves.in Argentina and Claudio Lazzari at the University of Tours, in France, have found an exception: the 13 species of lice that latch onto seals.

Dr Leonardi and Dr Lazzari disposed of the salinity question in 2014 by the simple procedure of dunking seal lice in seawater for prolonged periods, and discovering that they did not die. Now, as they report in theTo do so, they collected representatives of the louse species that dwells upon the deepest-diving pinniped of them all, the South Atlantic elephant seal, which can dive as far as 2,000 metres.

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