Yes, they exist and they have a life cycle moment hitching rides in fish gills.

https://www.xerces.org/wp-content/uploads/2009/06/pnw_mussel_guide_2nd_edition.pdf

United States Department of Agriculture
Agricultural Research Service
Agriculture Handbook Number 573
An Illustrated Guide
to Plant Abnonnalities Caused by Eriophyid Mites in North America
By Hartford H. Keifer, Edward W. Baker, Tokuwo Kono, Mercedes Delfinado, and William E. Styer
1982

https://naldc.nal.usda.gov/download/CAT87208955/PDF

Selected Tidal Marsh Plant Species of the San Francisco Estuary
A Field Identification Guide

http://www.spartina.org/project_documents/field_guide_tide_plants.pdf