tail fan

noun Zoology.
the fanlike posterior appendage of crayfish and lobsters, consisting of a telson and two uropods, used for rapid backward propulsion.

Origin:
1890–95

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World English Dictionary
tail fan
 
n
the fanned structure at the hind end of a lobster or related crustacean, formed from the telson and uropods

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They are the oldest known birds to have such a tail fan, which probably improved flight performance.
Geese are usually distinguished from overall color, characteristics of the flock, and occasionally the coloration of the tail fan.
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