Symmetry, Metamerism, and Coelom in Zoology
Explore the concepts of symmetry, metamerism, and coelom in zoology. Understand how organisms are arranged symmetrically, segmented into similar parts, and develop fluid-filled cavities. Discover the significance of these structures in providing support, flexibility, and essential functions for different organisms.
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Presentation Transcript
Symmetry, Metamerism and Coelom Dr. DEEPAK RAWAL Assistant Professor Department of Zoology MLSU Udaipur
Symmetry Def- arrangements of body parts/organs into geometrical axis/plans. Axis- imaginary line having two poles Advantages-Cepahlization, polarity, locomotion
Symmetry Division of organisms on basis of symmetry 1. Asymmetrical- eg. Sponges 2. Symmetrical- Spherical eg. Volvox Radial eg. Echinoderms eg. Platyhelminthes -Chordates Cnidarians Bilateral
Metamerism Def- division of body into linear series of similar parts/sections. Each part is called segment/somite/metamere. Hox genes are responsible for this. Head/Prostomium Trunk Tail/Pygidium
Metamerism Types- External (eg. Arthropoda) Internal (eg. Chordata {ribs, vertebrae, somites etc.} Both (eg. Annelida)
Metamerism Pseudometamerism/strobilization eg. Taenia
Coelom Def- fluid filled cavity between body wall and digestive tube covered on both side (outer and inner) by embryonic mesoderm. Triploblastic organisms Acoelomates Pseudocoelomates Coelomates Enterocoelomates Schizocoelomates
Coelom Significance of Coelom: 1. Provide space for viscera. 2. Provide flexibility. 3. Provide medium for circulation and nutrition. 4. Shok protection. 5. Collection of excretory matter.
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