It tells about the phylum porifera, ceolenerata, pltyhelminthes.......................................................................................................................!!!!!!!!!!!!!!!!!!!!!!!!!!
Published on: Mar 4, 2016
Transcripts - porifera,ceolenterata,platyhelminthes
Porifera are commonly referred to as sponges. Sponges can be
found on ocean floors in most places around the world.
In all cases, poriferans have a canal system, through which they
pump water. Water enters through pores called Ostia, flows through
canals to a spacious chamber called a spongocoel, and finally exits
through large openings called oscula.
They have small pores called Ostia.
They have canal system for passage of water current
A cavity called spongocoel is present, therefore they are called
They are covered with the hard covering or outer skeleton.
Digestion is intracellular that is within the cell
Respiration and excretion takes place through the general body
Reproduction takes place asexually as well as sexually
They are non motile animals attached to some solid support
The body design involves very minimal differentiation and division
Mostly found in seas, but a few species are found in fresh water also.
Coelenterata is scientifically classified from the Animalia
term Coelenterata is no longer recognized as scientifically
valid, as the Cnidaria and Ctenophora.
This phylum includes about 9000 species , which are mainly
marine ; few are fresh water . The name of this phylum came
from the stinging cells or cnidoblasts present on the ectoderm
of tentacles and the body of these carnivorous animals. This
phylum includes aquatic (marine and fresh water), solitary or
Dipoblastic body with two layers of cells, outer layer called ectoderm
or epidermis and the inner layer known as the endoderm or
The body is made up of two layers of the cells , one makes up
cells on the outside of the body , and the other makes the species
live in colonies like corals , while others have a solitary life-span
like hydra . Jellyfish and sea anemone are common examples
They have a central cavity called coelenteron in their body which is
also known as gastrovascular cavity
These animals are aquatic and mostly marine except hydra which
found in fresh water
They have only one opening in their body which is used for feeding
and for elimination of waste material
Digestion is both intracellular and intercellular
Aurelia aurita (Jelly fish)
A phylum of the invertebrates, commonly called the flatworms.
They are bilaterally symmetrical, nonsegmented, dorsoventrally
flattened worms characterized by lack
of coelom, anus, circulatory and respiratory systems, and exoor endoskeleton.
Three classes occur in the phylum:
(1) the Turbellaria, mainly freeliving, predacious worms; (2) the
Trematoda, or flukes, holozoic ectoor endoparasites; and (3) the
tapeworms, saprozoic endoparasites
in the enteron of vertebrates, whose
larvae are found in the tissues of
invertebrates or vertebrates.
Body of animals of this group is bilaterally
symmetrical, i.e. the left and the right halves of the
body have the same design
They are triploblastic, i.e. there are three layers of
cells, from which diffferentiated tissues can be
They have organ lable of organisation
There is no true internal body cavity or coelom, in
which well developed organs can be
The body is dorsoventrally flattened
They are either freeliving, or parastic
They have small
pores called Ostia
They have only two
germs layer, i.e. they
They are triploblastic, i.e.
there are three layers of
They possess cellular
level of organization
They possess tissue
They possess organ level of
The body cavity is
The body cavity is
There is no true internal
Digestion is both
They have incomplete
They are radially
They are bilaterally
Ex- Sycon , Spongilla
Ex- Taenia , Planaria