Rosyfin

Rosyfins are a sapient alien species. They're one of several species which have visited Earth in the 21st century as passengers in the Chirpsithra's interstellar liners.

Biology
Rosyfins are flattened slug-like creatures which need globular environmental tanks to survive on Earth. Inside their tanks, they remain immersed in murky fluids. They are named for a large, triangular rose-colored dorsal fin which runs from nose to tail.

Rosyfins consume glowing green lumps of something that Rick Schumann has nicknamed "green kryptonite".

Appearances

 * "Assimilating Our Culture, That's What They're Doing!", by Larry Niven (1979)
 * "Limits", by Larry Niven (1981)