Plural of glochidium; microscopic parasitic larval forms with hooks, found in freshwater mussels.
From Greek glochis ('barbed point') + diminutive -idium. The word refers to their extremely small, hook-bearing larval stage.
These tiny hooks let mussel larvae attach to fish gills and hitchhike to new water bodies—it's nature's brilliant solution for organisms that can't swim, using their hosts as transportation.
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