Coral Reef Fact:
Sea butterflies are small sea snails which float freely in the water with the
Limacina helicina Photo by Russ Hopcroft, University of Alaska, Fairbanks.
currents. Their bodies have adapted to this existence, shrinking their shell & gills & the foot has become 2 wing-like lobes(parapodia) used to move it through the sea. Even though “their shell may be so fine as to be transparent, it is nevertheless calcareous” & threatened by ocean acidification.
Fact source: http://en.wikipedia.org/wiki/Sea_butterfly
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