Animal Kingdom - Notes | Class 11 | Part 6: Aschelminthes

4. ANIMAL KINGDOM

PHYLUM ASCHELMINTHES (ROUNDWORMS): GENERAL CHARACTERS

1. Grades of organization:
• Organ system.
2. Symmetry:
• Bilateral symmetry.
3. Germ layers:
• Triploblastic.
4. Coelom:
• Pseudocoelomate.
5. Habit and habitat:       
• Aquatic and terrestrial. Free living or parasitic in plants & animals.
6. Digestive system:          
• Complete. Tubular alimentary canal with well-developed muscular pharynx.
7. Respiratory system:
• Absent
8. Circulatory system:
• Absent
9. Reproduction:
• Dioecious (Sexes are separate).
• Sexual reproduction.
• Internal fertilization.
• Development is direct or indirect.
10. 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.
11. Examples:
• Ascaris (Roundworm)
• Ancylostoma (Hookworm)
• Wuchereria (Filarial worm).

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👇 Select Your Topic Here 👇

• Topic 1: Basis of Classification
• Topic 2: Porifera
• Topic 3: Cnidaria
• Topic 4: Ctenophora
• Topic 5: Platyhelminthes
• Topic 6: Aschelminthes
• Topic 7: Annelida
• Topic 8: Arthropoda
• Topic 9: Mollusca
• Topic 10: Echinodermata
• Topic 11: Hemichordata
• Topic 12: Chordata - up to Sub phylum Vertebrata
• Topic 13: Chordata - Cyclostomata, Pisces
• Topic 14: Chordata - Tetrapoda