The first rudists ( " Sphaerulites patera " and " Biradiolites lumbricalis " ) start to appear in this level.
2.
"F . lumbricalis " is also an important habitat-forming seaweed, forming underwater " belts " often just below those of bladderwrack.
3.
The most important species, " Furcellaria lumbricalis ", grows on submerged rocks to a depth of about, but it can also grow in large floating mats, which are easier to harvest.
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