Phylum-Arthropoda

Animals related to this phylum show features as- 

• Body is bilaterally symmetrical,triploblastic and with coelom.
• Body is divided in three parts i.e. head , thorax and abdomen.
• Body has jointed legs .
• Body is exoskeleton made of chitin.
• Digestive system is complete with a mouth and anus.
• Respiratory organs are “tracheae”.
• Eyes are compound. Antennae are tactile organs.
• Body cavity is called as “hemocoel”. Open circulatory system is present. Heart is dorsally placed.
• Sexes are separate . Larval stage is seen in life cycle. 

Examples- Insects (Fly,Mosquito,Bedbug, etc ) Scorpion,Crab,Spider etc.

Cockroach

Prwan

Some Arthropods