Multiple choice

Glochidium is a larval stage in the life cycle of

  1. porifera

  2. coelenterata

  3. mollusca

  4. echinodermata

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glochidium is a parasitic larval stage unique to freshwater bivalves (family Unionidae), which includes mussels. These larvae attach to fish gills as part of their life cycle. Porifera have amphiblastula larvae, Coelenterata have planula larvae, and Echinodermata have bipinnaria and pluteus larvae.