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Example of Non Chordata

Updated on November 3, 2013

Animal Diversity

 Chordates and NonChordates (Phylum Porifera - Phylum Echinodermata)
Chordates and NonChordates (Phylum Porifera - Phylum Echinodermata)

Kingdom Animalia are divided into two major groups, viz., the non chordates and chordates.

Non chordata includes a number of phyla.The major ones are Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca and Echinodermata.

Example of Phylum Porifera

Euplectella - the Venus flower basket

Euspongia- the bath sponge

Spongilla - the fresh water sponge

Phylum Porifera

Includes pore bearing animals animals like sponges.

  • Body wall is diploblastic.
  • Spicules are secreted by sclerocytes and germ cells by archaeocytes.
  • Nervous system absent.
  • Larvae are amphiblastula


Example of Coelenterata

Obelia: Marine and colonial with metagenesis.

Physalia: Polymorphic

Corals and Sea anemone belong to the class Anthozoa

Phylum Coelenterata

  • Diploblastic and radially symmetrical
  • Mouth is surrounded by nematocyst bearing tentacles.
  • A nerve net present.
  • Larva is planula.


Example of Phylum Platyhelminthes

Free living: Planaria

Liver fluke: found in the bile duct and liver of sheep.

Schistosoma: Found in the veins of man

Taenia solium: the pork tapeworm.

Phylum Platyhelminthes

  • Includes flat worms.
  • Body cavity is absent.
  • Excretion by flame cells or solenocytes.


Example of Nematoda

Ascaris, pinworm, Hook worm, Filarial worm etc.

Phylum Aschelminthes (Nematoda)

Includes round worm.

Epidermis is syncytial and body cavity is pseudocoel.

Example of Annelida

Nereis: marine, locomotion and excretion by parapodia

Leech: sanguivore, saliva contains an anticoagulant, Hirudin

Earthworm (Megascolex)

Phylum Annelida

Includes segmented worms.

Body cavity is a Coelom (Schizocoel) except in Leeches.

Excretion by Nephridia


Example of Arthropoda

  • Prawn aquatic with two pairs of antennae.
  • Cockroarch with three pairs of legs, two pairs of wings
  • Cicada with 17 years of underground larval life.
  • Scropion : antennae are absent ,viviparous.
  • Peripatus : walking worms, a living fossil

Phylum Arthropoda

Includes jointed legged animals.

Body is covered by Chitin.

Body cavity is Haemocoel.

Respiratory pigment is haemocyanin.

Arthropoda | Source

Example of Mollusca

  • Sepia with internal shell and ink sac.
  • Octopus: the devil fish
  • Pinctada: The pearl oyster.
  • Nautilus and Neopalina are living fossils.
  • Teredo: the shipworm

Phylum Mollusca

Includes segmented, soft bodied animals with a hard shell. Larve are glochidium or trocophore (veliger)..

Phylum Mollusc
Phylum Mollusc

Example of Echinodermata

  • Starfishes
  • Sea urchins : In the pharynx of the sea urchinis is a chewing apparatus called Aristole lantern. it's development is similar to chordata
  • Brittle star
  • Sea cucumber
  • Sea lily

Phylum Echinodermata

Includes spiny skinned animals.

All are marine. Adults are radially symmetrical and larvae are bilaterally symmetrical.

Phylum Echinodermata
Phylum Echinodermata


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