Emperor or Imperialis Shrimps

( Periclimenes imperator ) hitching a ride on Nudibranch  (Ceratosoma trilobatum)

A good example of a relationship that demonstrates commensalism is between the Imperial Shrimp and a large nudibranch. The shrimp will ride on the nudibranch, receiving transportation. The nudibranch helps serves as a transporter to food sources. The imperial shrimp is able to ride on the nudibranch, getting exposed to larger areas with more potential food sources while using less energy.

The Imperial Shrimp is also commonly found riding on sea-cucumbers often with a mate. During the ride, small battles ensue between the two shrimp fighting over the best turf on the nudibranch or sea-cucumber. This bizarre relationship goes unnoticed by the transporter…