What is the long, snaking dark line found in the visible light image of Saturn shown below?
Is there an analogous feature on Earth? 
Definitions:
Pollinators
Animals or insects that transfer pollen from one flower to another, facilitating plant reproduction.
Megaspore
A type of spore in some plants that develops into a female gametophyte, distinguished by being larger than other types of spores, such as microspores.
Female Gametophyte
The gamete-producing structure in plants and algae that develops into the female gamete.
Embryo Sac
Female gametophyte (megagametophyte) of flowering plants.
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