4. ANIMAL KINGDOM
Hemichordata was earlier considered as a sub-phylum of Chordata. Like chordates, it has pharyngeal gill slits.
- Grades of organization:
- Organ system.
- Symmetry:
- Bilateral.
- Germ layers:
- Triploblastic.
- Coelom:
- Coelomate.
- Habit and habitat:
- Exclusively marine.
- Digestive system:
- Complete.
- Respiratory system:
- Gills.
- Circulatory system:
- Open type.
- Reproduction:
- Dioecious.
- External fertilization.
- Development is indirect.
- Unique features:
- Worm-like cylindrical body formed of anterior proboscis, a collar and a long trunk.
- Collar bears stomochord (a rudimentary structure similar to notochord).
- Excretion by Proboscis gland.
- Examples:
- Balanoglossus (Tongue worm), Saccoglossus.
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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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