In this article we will discuss about Water Vascular System of Echinoderms:- 1. Introduction to Water Vascular System 2. Contents of Water Vascular System 3. General Plan 4. Modifications 5. Functions. Introduction to Water Vascular System: The water vascular system is enterocoelic in origin and arises from the left hydrocoel. It exhibits radial symmetry from […]
Water Vascular System of Echinoderms
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Larva Found in Phylum Echinodermata
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Larva Found in Phylum Echinodermata! 1. Dipleurula Larva: 1. The dipleurula form (Fig. 21.39A) is reached during development and is characterised by its bilaterally symmetrical, egg-shaped body. 2. The ventral concave side bears the mouth and is encircled by a circumoral ciliated band. 3. The anus is disposed ventrally. 4. The digestive canal is differentiated […]
Sagitta: An Example of Phylum Chaetognatha
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In this article we will discuss about Sagitta:- 1. Habit and Habitat of Sagitta 2. External Structures of Sagitta 3. Body Wall 4. Coelom 5. Digestive System 6. Circulatory, Respiratory and Excretory Systems 7. Nervous System 8. Reproductive System 9. Development. Habit and Habitat of Sagitta: Sagitta is a marine planktonic animal which lives throughout […]
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