phor·e·sy 
(fôrĭ-sē)
(fôrĭ-sē)n.
An association between two species in which one transports the other, for example when a mite attaches to a beetle and is carried to a new food source.
[New Latin phorēsia, from Greek phorēsis, a carrying; see -PHORESIS.]
pho·retic (fə-rĕtĭk) adj.