The following points highlight the eight different structures of water vascular system in Asterias. The structures are: 1. Madreporite 2. Stone Canal 3. Ring Canal 4. Polian Vesicles 5. Tiedmann’s Bodies 6. Radial Canals 7. Lateral or Podial Canals 8. Tube-Feet (Podia) and Ampulla. Structure # 1. Madreporite: The water vascular system starts with the […]
Structures of Water Vascular System in Asterias
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Phylum Ectoprocta: Features, Classification and Affinities
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In this article we will discuss about Phylum Ectoprocta:- 1. Characteristic Features of Phylum Ectoprocta 2. Classification of Phylum Ectoprocta 3. Affinities. Characteristic Features of Phylum Ectoprocta: 1. Phylum Ectoprocta are mostly marine and some are freshwater animals. 2. Un-segmented, bilaterally symmetrical, sessile, colonial coelomate animals of trimeric construction except Monobryozoon which lives in solitary […]
Ophiura: Example of Phylum Echinodermata
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In this article we will discuss about Ophiura:- 1. Habit and Habitat of Ophiura 2. External Structures of Ophiura 3. Body Wall 4. Coelom 5. Digestive System 6. Respiratory System 7. Water Vascular System 8. Haemal System or Blood Lacunar System 9. Locomotion 10. Excretory System 11. Nervous System 12. Reproductive System. Contents: Habit and […]
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