Nematoda vs annelida
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Roundworms of the phylum Nematoda have elongated cylindrical bodies covered in a tough cuticle. They have a complete digestive tract that is a tube-within-a-tube body plan. Nematodes possess a pseudocoelom rather than a true coelom. Segmented annelid worms are distinguished by their externally divided bodies. They also have a tube-within-a-tube body plan with a fluid-filled coelom between the inner and outer tubes. The coelom contains mesoderm and holds the body organs in place. Annelids are divided into three classes: Polychaeta, Oligochaeta, and Hirudinea.
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9. Phylum Porifera Notes
Phylum Porifera includes about 5,000 living species of sponges. There are three main classes: Hexactinellida (glass sponges), Demospongia (most diverse class making up 90% of species), and Calcarea (found in shallow waters with calcium carbonate spicules). Sponges are the most primitive multicellular animals and feed by filtering water through their outer walls using flagella and contractile cells to pump water in and out for feeding, waste removal, and oxygen intake. They reproduce both sexually and asexually.
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