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B
Unio
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C
Sepia
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D
Asterias
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Solution
The correct option is BUnio Glochidium is a larval stage found in Unio. Unio is a genus of freshwater mussels, aquatic bivalve mollusks. Glochidium has sharp spines that project inward from each valve. It attaches to the gills or fins of fish and becomes a temporary parasite. Later, it leaves the fish and metamorphoses into an adult.