Lyngbya, a filamentous blue-green alga (cyanobacterium) that usually has many cells joined together, is seen in an undated handout photo released April 18, 2010. The ocean depths are home to myriad species of microbes, mostly hard to see but including spaghetti-like bacteria that form whitish mats the size of Greece on the floor of the Pacific, scientists said on Sunday.[Xinhua/Reuters]