Arthropoda:

Organization:  Organ level

Symmetry:  Bilateral

Coelom:  present (coelomates)

Segmentation:  Present

Arrangement of embryonic layers: Triploblastic

Digestive system: Complete

Circulatory system: Present

Respiratory system: Present

Habitat: Terrestrial and aquatic both.

Sexuality: Dioecious (sexes are separate).

 Notochord: Absent

 Reproduction: Sexual (oviparous)

Fertilization: Internal (indirect / direct)

Respiratory organ: Gills, book gills, book lungs or tracheal system.

Excretory organ: Malphigian tubules

Distinctive features:

• It is the largest phylum of animalia kingdom.
•   The body of arthropods is externally covered by chitinous exoskeleton.
• The body consists of head, thorax and abdomen.
• They have jointed appendages, thats why these are called arthros (joint)  poda(appendages).