4. ANIMAL KINGDOM
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).
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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
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