Cell Cycle and Cell Division - Meiosis
Phylum Aschelminthes (Roundworms): General Characters
- Grades of Organization: Organ system.
- Symmetry: Bilateral symmetry.
- Germ Layers: Triploblastic.
- Coelom: Pseudocoelomate.
- Habit and Habitat: Aquatic and terrestrial. Free living or parasitic in plants & animals.
- Digestive System: Complete. Tubular alimentary canal with well-developed muscular pharynx.
- Respiratory System: Absent
- Circulatory System: Absent
- Reproduction:
- Dioecious (Sexes are separate).
- Sexual reproduction.
- Internal fertilization.
- Development is direct or indirect.
- Unique Features:
- Body is circular in cross section.
- An excretory tube to remove body waste through excretory pore.
- Male and female are distinct. Females are longer than males.
- Examples:
- Ascaris (Roundworm)
- Ancylostoma (Hookworm)
- Wuchereria (Filarial worm).
