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Phylum Annelida consists of segmented worms called annelids. They have a segmented body with repeated units called metameres or segments. Annelids include earthworms, leeches. They exhibit a variety of lifestyles, including free-living, parasitic, and predatory. General Characteristics: 1) Habitat: They are free living, found in aquatic both marine and freshwater and terrestrial environments. 2) Shape: Body is … Read more
Nematoda, or roundworms, are a phylum of cylindrical, unsegmented worms with a complete digestive system. They are found in diverse environments and include free-living species as well as parasitic species that infect plants, animals, and humans. General Characteristics: 1) Habitat: Mostly parasitic (in animals/plants), few free living. 2) Shape: Body is perfectly cylindrical in shape adapted for living in … Read more
Platyhelminthes, or flatworms, are a phylum of simple, unsegmented, bilaterally symmetrical worms. They have a flattened body, lack a body cavity (acoelomates), and include free-living species like planarians and parasitic species like tapeworms and flukes. General characters of Phylum Platyhelminthes: 1) Habitat: Most of species are parasitic (Ecto-Endo parasite), few are free living (aquatic/terrestrial). 2) Shape: Body is ‘dorso-ventrally … Read more
Ctenophora, also known as comb jellies, are a phylum of marine animals characterized by their gelatinous bodies, radial symmetry, and eight rows of cilia, called comb rows, used for locomotion. They capture prey with sticky cells called colloblasts. General Characteristics of Phylum Ctenophora: 1) Habitat: All species are marine; either solitary or colonial. 2) Symmetry: They have biradial symmetry, … Read more
Cnidaria is a phylum of aquatic animals that includes jellyfish, corals, and sea anemones. They have radial symmetry, a simple digestive cavity, and specialized stinging cells called cnidocytes for capturing prey and defense. General Characters of Phylum Cnidaria: 1) Habitat: Mostly aquatic or marine habitat, solitary or colonial. 2) Symmetry: Body is radially symmetry. 3) Germ Layer: … Read more
Porifera (Sponges) (L. porous=pore; ferre=bearer) Porifera, or sponges, are simple, non-motile animals that live in aquatic environments. They have porous bodies and a canal system through which water flows, allowing them to filter feed on small particles. General Characters of Phylum Porifera 1) Habitat: They are aquatic organisms generally marine, with a few freshwater species. 2) Symmetry & … Read more