Are annelids amphibians?

Asked by Priyanka | 30th Oct, 2014, 09:56: PM

Expert Answer:

Annelida and Arthropoda are two separate phyla that belong to the Kingdom Animalia.

Characteristics of phylum annelida:

  • The body is cylindrical and divided into ring-like segments. In each segment, there is representation of different organ systems.
  • Have a well-developed digestive system with an alimentary canal open at both the ends. It consists of mouth and anus.
  • Have a true body cavity called coelom, present between the body wall and the digestive tube. It is filled with coelomic fluid.
  • The body cavity is lined with coelomic epithelium.
  • Presence of thin and moist layer called cuticle on the body.
  • Examples – Earthworm, leech, nereis

Characteristics of phylum arthropoda:

  • They have jointed limbs, one pair each on some or on all body segments.
  • They have an exoskeleton made of chitin. They cast off their exoskeleton during growth in early life, which is regrown. The casting off and the exoskeleton is collectively called moulting.
  • They have a complex muscular system, with exoskeleton for attachment, striated muscles for rapid actions and smooth muscles for visceral organs. Lack cilia.
  • Sense organs consist of well-developed eyes, gustatory organs, antennae, balancing organs and auditory organs.
  • Excretory organs are Malpighian tubules or green glands.
  • Examples – Crab, spider, mosquito, butterfly

Answered by Hemangi Binny | 31st Oct, 2014, 07:11: AM