Phylum- ARTHROPODA

ANIMAL KINGDOM

PHYLUM Arthropoda

Animals with jointed feet and appendages

GENERAL CHARACTERISTICS

01 GENERAL CHARACTERISTICS

BODY DESIGN

• Arthropods have bilateral symmetry and a metamerically segmented body. Segments are joint internally
• Arthropod body consists of three major sections- a head, thorax, and abdomen. Sometimes the head and thorax are fused together into a cephalothorax.
• Three germ layers are present in their body walls -Triploblastic
• They have a true coelom that is completely lined by the mesoderm layer.
• Presence of different organs i.e. division of labour is there
• Equipped with joint appendages
• Head appendages- Feeding and Sensory reception
• Thorax and Abdomen Appendages- Locomotion

01 GENERAL CHARACTERISTICS

BODY COVERING

• Have an thick, hard and non living exoskeleton of chitin

DIGESTIVE SYSTEM

• Have a complete digestive tract (Mouth-Anus)
• The alimentary canal consists of the stomodaeum (fore gut), mesenteron(mid gut), and proctodaeum(hind gut)

CIRCULATORY SYSTEM

• Arthropods possess an open circulatory system consisting of a dorsal heart and a system of arteries ( limited as in insects or extensive as in crabs)
• The arteries deliver blood into tissue spaces (hemocoels), from which it eventually drains back to a large pericardial sinus surrounding the heart

01 GENERAL CHARACTERISTICS

RESPIRATORY SYSTEM

• Aquatic arthropods (crustaceans and the chelicerate horseshoe crabs) possess gills for respiration
• Terrestial arthropods possess tracheae and book lungs as respiratory organs

EXCRETORY SYSTEM

• malpighian tubules or green gland

ENDOCRINE SYSTEM

• Well defines endocrine system - Coordination

01 GENERAL CHARACTERISTICS

NERVOUS SYSTEM

• Dorsal brain with ventral nerve cord

REPRODUCTION

• Sexes are separate. Sexually dimorphism is present
• Fertilization: internal
• Development: direct or indirect with larval stages

EXAMPLES

02 EXAMPLES - Economically important insects

Apis (Honey bee)

02 EXAMPLES - Economically important insects

Bombyx (Silk worm)

• The silkworm litter is used for bio-gas production and used as a fuel for cooking in the rural area. Sericulture not only provides silk for fashionable clothings, it also provides several very useful bye products to the human society

02 EXAMPLES - Economically important insects

Laccifer (Lac insect)

• Resin secreted by the female lac bug on trees is processed and sold as dry flakes.

02 EXAMPLES - Vectors

Anopheles, Culex, Aedes (Mosquitoes)

02 EXAMPLES - Gregarious pest

Locusta (Locust)

02 EXAMPLES - Living Fossil

Limulus (King crab)

• Bulleted list
• Bulleted list

THANK YOU!

EFFORTS BY: Amisha Kapoor (5) & Arshia Garg (8) (XI B)