1.
Biology
Biology

2.
Sir Hassan Bin Sadat
– Nauvera Shaukat
– Roll Number 27
– :
Phylum
Echinodermata
Submitted To:
Sir Hassan Bin Sadat
Submitted By:
Nauvera Shaukat
Roll Number 27
:

3.
Definition:
Any marine animal of the invertebrate phylum E
chinodermata, having aradiating arrangement of
parts and a body wall stiffened by calcareouspi
eces that may protrude as spines and including
the starfishes, seaurchins, sea cucumbers, etc.

4.
 phylum Echinodermata animal kingdom, Animalia, kingdom
Animalia taxonomic kingdom comprising allliving or extinct animals.
 Asteroidea, class Asteroidea - sea stars
 class Ophiuroidea, Ophiuroidea - brittle stars and basket stars
 class Echinoidea, Echinoidea - sea urchins and sand dollars
 class Crinoidea, Crinoidea
 class Holothuroidea, Holothuroidea -
class of echinoderms including the sea cucumbers
 phylum -
(biology) the major taxonomic group of animals and plants; contains classes
Classification

5.
Characteristics of Echinodermata
– 1)Possess 5-rayed symmetry, mostly radial, sometimes bilateral.
2)Body has more than two cell layers, tissues and organs.
3)Body cavity a true coelom.
4)Most possesses a through gut with an anus.
5)Body shape highly variable, but with no head.
6)Nervous system includes a circum-oesophageal ring.
7)Has a poorly defined open circulatory system.
8)Possesses a water vascular system, which hydraulically operates the tube feet or feeding
tentacles.
9)Without excretory organs.
10)Normally possesses a subepidermal system of calcareous plates
11)Reproduction normally sexual and gonochoristic.
12)Feeds on fine particles in the water, detritus or other animals.
13)All live marine environments.

6.
Examples:
;
Sea stars
Sea Urchins
Sea Cucumbers
Sand Dollars
Sea Lilies

7.
Star Fish

8.
Star Fish
Re Production
They Can reproduce both by sexual and asexual

9.
Digestion in Star Fish

10.
Regeneration
– Star fish can Regenerate of their lost or injured body parts

11.
Harmful effect of Star fish in
environment
– Effect of starfish in environment:
– There are many species of starfish that are poisonous and even deadly to
humans. Thecrown of thorns, the sun star, the spiny sun star and the leather
star are some of them. Their spines are the poisonous parts.