LOGY-Z

Kingdom Protista. Kingdom Animalia. Phylum Platyhelminthes.  Phylum annelida.  Phylum Mollusca. Phylum Arthropoda.

Diversity of Polychaeta Errant Polychaetes Free-living forms. (Active lives) well-differentiated head with prominent sense organs. They have well-developed parapodia. They can be crawling over the surface using parapodia & setae. Dorsoventrally flattened body. Well-developed longitudinal muscle(thin circular muscl…

Diversity of Oligochaetes 3100 species. Many species live in freshwater. (all types of freshwater habitats) Aquatic forms are smaller than terrestrial forms. Dero  4 pairs of ciliated body projection. Stylaria well-developed sense organs & slender, long, flexible setae  useful in swimming. Branchiura  long digita…

Diversity of Hirudinea 500 species of leeches. Most leeches are in freshwater & Few leeches on marine fishes. A most primitive group of leeches lack their anterior suckers. Their anterior segments are septate & pairs of setae present on them. Parasitic on salmon fish. 1. Acanthobdella. Acanthobdella. Some le…

Classification of phylum annelids  Classification and Diversity of the  Phylum Annelida  by focussing on the  class Polychaeta ,  class Oligochaeta  and the  class Hirudinea.               Character                   Polychaeta                Oligochaeta                Hirudin…

Phylum Annelida Body Bilateral symmetry. Triploblastic. Elongated, Sub-cylindrical body. Smallest one -less than 1mm. largest one 3m-4m. The body is basically divided into 3 regions, They are, 1.Prostomium 2.Trunk 3.Pygidium Larvae develop by adding segments one by one in front of the pygidium. The oldest segment to …