Biology

Biology

Sir Hassan Bin Sadat– Nauvera Shaukat

– Roll Number 27

– :

PhylumEchinodermata

Submitted To:Sir Hassan Bin Sadat

Submitted By::Nauvera Shaukat

Roll Number 27:

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

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

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.

Examples:

;

Sea starsSea Urchins Sea CucumbersSand DollarsSea Lilies

Star Fish

Star FishRe Production

They Can reproduce both by sexual and asexual

Digestion in Star Fish

Regeneration

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

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.