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After a glochidium attaches to a fish, epithelial cells and connective tissue migrate to encapsulate the larval mussel, forming a cyst that protects it from the aquatic environment.
The glochidium undergoes transformation into a juvenile mussel during this parasitic phase.
However, the veliger, which is called a glochidium in the family Unionidae, has become a highly modified parasitic larva.
and Proteocephalus percae are core parasite species, Glochidium sp.
Most unionoid bivalves attach to a host fish in order to metamorphose from a glochidium into a juvenile (Williams et al.
Once the glochidium has attached to external or branchial tissue of the fish, epidermal or branchial epithelial cells of the host ultimately encapsulate the larva, forming a cyst (Arey, 1921, 1932a, b; Fustish and Millemann, 1978; Karna and Millemann, 1978; Kat, 1984; Jeong, 1989; Waller and Mitchell, 1989; Nezlin et al.