in animal phylum first time head formation takesplace in
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Animal phyla are classified according to certain criteria, including the type of ... The pouches enlarge until they meet and fuse, forming an enterocoelom.
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In animal phylum, first time head formation takes place in 
More information on Platyhelminthes
★ These animals are flattened. Their shape is like a leaf or ribbon.
★ These animals are triploblastic, bilaterally symmetrical and acoelomate.
★ They have organ level of organisation.
★ Circulatory system is absent and osmoregulation is performed by flame cells (solenocytes)
★ These are hermaphrodite, fertilisation is internal and development is indirect (that is, larva is formed)
★ Example :- Fasciola (Liver Fluke)
Planaria (Dugesia)
Taenia (Tapeworm)
Hope it helps dear friend ☺️✌️
More information on Platyhelminthes
★ These animals are flattened. Their shape is like a leaf or ribbon.
★ These animals are triploblastic, bilaterally symmetrical and acoelomate.
★ They have organ level of organisation.
★ Circulatory system is absent and osmoregulation is performed by flame cells (solenocytes)
★ These are hermaphrodite, fertilisation is internal and development is indirect (that is, larva is formed)
★ Example :- Fasciola (Liver Fluke)
Planaria (Dugesia)
Taenia (Tapeworm)
Hope it helps dear friend ☺️✌️
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