Metamerism in Annelids i

00:00:01 Introduction and Definition: Defining Metamerism as the division of an animal's body into a series of repeating homologous segments called Metameres or Somites.
00:00:54 Occurrence in the Animal Kingdom: Mentioning that metamerism first appeared in Annelids, and is also found in Arthropods, Vertebrates, and the class Monoplacophora of the Phylum Mollusca [01:23].
00:01:54 Significance of Metamerism: It helps in locomotion, provides better coordination of body movements, and contributes to increased complexity in organisms.
00:02:22 Comparison of Metamerism Types: Comparing metamerism across phyla:
00:02:30 Annelids: Show External plus Internal metamerism (True Metamerism), categorized as Homonomous Metamerism. All segments are similar/identical [04:20] with equally distributed organs (nerves, blood vessels, setae, coelomic pouches). The coelom also shows metamerism [05:24].
00:03:07 Arthropods: Show only External metamerism, categorized as Heteronomous Metamerism.
00:03:19 Vertebrates: Show only Internal metamerism, categorized as Heteronomous Metamerism.
00:05:51 True Metamerism vs. Pseudometamerism:
00:06:30 True Metamerism: The number of segments is fixed at birth (e.g., Earthworm). Growth is due to an increase in segment size [08:21], and segments are functionally interdependent [09:14].
00:07:00 Pseudometamerism (False): New segments (Proglottids) keep adding after birth (e.g., Tapeworm). Growth is due to an increase in the number of segments [08:44], and segments are independent [09:30].
00:09:50 Theories of Metamerism (Most Accepted):
00:10:25 The most accepted theory is the Clark's Locomotion Theory.
00:10:47 Core Idea: Metamerism developed as an adaptation to peristaltic locomotion and burrowing.
00:11:50 Mechanism: The coelomic fluid acts as a hydrostatic skeleton, distributing strain and preventing excessive pressure on the body to support locomotion and burrowing.
00:13:21 Conclusion.
Video URL: Metamerism in Annelids i#dsssb #biology #zoology #animaldiversity #uppsc #metamerism #giclecturer



Animal Diversity #csirnetjrf #csirnet #mducee2023 #mducee:    • Animal Diversity #csirnetjrf #csirnet #mdu...  

Endocrinology #csirnetjrf #csirnet #lifesciences Biosynthesis of #hormones:    • Endocrinology #csirnetjrf #csirnet #lifesc...  

Vermiculture #earthworm #pheretimaposthuma #csirnetjrf #csirnet #msczoology:    • Vermiculture  #earthworm #pheretimaposthum...  

   • Protozoan 10  most imp. Diseases #mducee #...  

   • Mimicry / mimicry & its types / Batesian ,...  

   • Muscle tone physiology / how muscle tone i...  

   • Types of Cladogram - Monophyletic, Paraphy...  

   • Gene Therapy & types of gene therapy / som...  

   • Sericulture / silkworm species/ life cycle...  

   • Metamorphosis, types & Neuroendocrine regu...  

   • Fruits & its types #mducee2024 #simplefrui...  

   • Nitrogen Fixation #mducee #mdu #mducee2024...  

   • Types of Scale & Types of vertebrae #zoolo...  

   • Recycling of RBC #humanphysiology  #csirne...  

   • DNA Damage & Repair #csirugcnetjrf #csirne...  

   • Speciation & Types of speciation #mducee20...  

   • Regulation of food intake #csirnetjrf #lif...  

Animal Diversity #csirnetjrf #csirnet #mducee2023 #mducee:    • Animal Diversity #csirnetjrf #csirnet #mdu...  

Endocrinology #csirnetjrf #csirnet #lifesciences Biosynthesis of #hormones: https://www.youtube.com/playlist?list... Assistant Professor ZOOLOGY 2025 #uppsc #zoology #assistantprofessor: https://www.youtube.com/playlist?list... #earthworm #pheretimaposthuma #csirnetjrf #csirnet #msczoology: https://www.youtube.com/playlist?list... Assistant Professor ZOOLOGY 2025 #uppsc #zoology #assistantprofessor:    • UP Assistant Professor ZOOLOGY 2025 #uppsc...  

Animal Diversity #csirnetjrf #csirnet #mducee2023 #mducee:    • Animal Diversity #csirnetjrf #csirnet #mdu...  

Endocrinology #csirnetjrf #csirnet #lifesciences Biosynthesis of #hormones:    • Endocrinology #csirnetjrf #csirnet #lifesc...  

Vermiculture #earthworm #pheretimaposthuma #csirnetjrf #csirnet #msczoology:    • Vermiculture  #earthworm #pheretimaposthum...  


#zoology #uppsc #animalkingdom #dsssb #biology #animalscience #canalsysteminsponges #hons #bsc #uppsc #mppsc #zoology UPPSC ASSISTANT PROFESSOR ZOOLOGY 2025 ##uppsc #assistantprofessor #zoology #dsssb #hpsc #mppsc