Pseudoscorpion riding on the back of a harlequin symbolises a biological relationship termed as "Commensalism"
Step-by-step explanation:
Commensalism refers to a type of biotic relationship in which one of the interacting species is no gain-nor loss condition while the other species is benefitted.
Pseudoscorpion riding on the back of a harlequin engages in "Commensalism". This relationship can be explained as follows-
Harlequin beetles reside in the dead fig tree. They have the ability to fly. Their locomotory ability is well used by pseudoscorpions who clasp on beetles body and use it for mating purpose. It must be remembered that pseudoscorpions have not the locomotory ability of their own.
While pseudoscorpions are benefitted by the complete process, there is no effect on beetles