Petromyzon presentation for college.pptx

Presentatinon on Petromyzon.

1. PRESENTATION ON PETROMYZON By: Manjula Naik B.G.D COLLEGE KESAIBAHAL DEPARTMENT OF ZOOLOGY ROLL NO. :BS-24-024 UNIV ROLL NO. : S12424ZOO021

2. CONTENT 1. Introduction 2. Classification 3. Morphology and Anatomy 4.Life cycle 5. Habitat & Distribution 6.Ecological and Economic Importance 7. Conclusion

3. Introduction Petromyzon is a genus of lampreys, jawless fish belonging to the class Agnatha . Often referred to as “living fossils” due to their primitive characteristics. Found in both freshwater and marine environments.

4. Classification Kingdom: Animalia Phylum: Chordata Class: Hyperoartia Order: Petromyzontiformes Family: Petromyzontidae Genus: Petromyzon

5. Morphology and Anatomy Elongated, eel-like body without scales. Lack of jaws; instead, they have a circular, sucker-like mouth with sharp teeth. No paired fins, cartilaginous skeleton. Seven pairs of gill openings.

6. Life Cycle Larval stage ( Ammocoetes ): Burrow in sediment and filter-feed for several years. Metamorphosis: Develops eyes, a sucker mouth, and migrates to open waters. Adult stage: Some species are parasitic, feeding on the blood of fish. Reproduction: Migrate upstream to spawn and die after laying eggs.

7. Habitat and Distribution Found in temperate regions of North America and Europe. Live in both freshwater (rivers, lakes) and marine environments. Some species migrate between freshwater and saltwater.

8. Ecological and Economic Importance Some species are invasive and harmful to fish populations (e.g., Petromyzon marinus in the Great Lakes). Used in scientific research and as a model for vertebrate evolution. In some regions, lampreys are consumed as food.

9. Conclusion Petromyzon represents an ancient lineage of jawless vertebrates. Their parasitic behavior impacts ecosystems and fisheries. Studying them helps us understand vertebrate evolution and adaptation.

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