Larval forms of Crustacea.pptx
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This document summarizes the larval forms of crustaceans. It describes several key larval stages including nauplius, metanauplius, protozoea, zoea, mysis, cypris, kentrogen, alima, megalopa larva, and phyllosoma larva. Each larval stage develops from the previous one and has distinguishing morphological features such as the number of appendages and presence of a carapace, rostrum, or compound eyes before developing into the adult form. The larval stages allow crustaceans to develop indirectly from egg to adult through a series of morphological changes.
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- 1. Larval forms of Crustacea K.Kamatchi Assistant Professor Department of Zoology Vivekananda College Tiruvedakam West
- 2. •Direct or indirect •Egg – hatches – young one – resemble – adult •Egg – hatches – larval stages – adult
- 3. Nauplius First larva Free swimming Minute and microscopic Oval – shape Cephalothorax, abdomen Simple median eye 3 pairs of appendages Uniramous Biramous – antenna, mandible Caudal fork Under goes moults- metanaupilus.
- 4. Metanauplius Second larva Develops from nauplius Cephalothorax, abdomen Caudal fork Frontal sense organ Median eye.
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- 6. Zoea Developes – protozoea Free swimming Minute, microscopic Cephalothorax, abdomen Carapace Rostrum 5 cephalic app 3 thoracic app Remain 5 buds Abdomen – no – app Telson
- 7. Mysis Develops – zoea Elongated, laterally compresed Cephalothroax, abdomen Carapace Rostrum All appendages developed Differ from adult by brood pouch.
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- 12. Phyllosoma larva Directly – egg Glass –crab Modified Mysis Cepha, abdo Carapace Compound eye