Question

62 Spinny skinned animals
belong to the group:
Protochordate
Molluscs

Echinodermata
Nematoda

Other:​

Answer 1

Answer:

0

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Study Material»Biology for AIPMT»Animal Kingdom»Phylum- Annelida Arthropoda Mollusca and Echinodermata

Phylum- Annelida, Arthropoda, Mollusca and Echinodermata

PHYLUM - ANNELIDA

Lamarck coined the term Annelida.Free living found in moist soil, fresh water, sea or few are parasite.Body is soft elongated, cylindrical or flattened divided into segments or metamers by ring like, groves called Annuli.

Symmetry - Bilateral, Germ layer - Triploblastic, Level of organisation - Organ-system level having tube within tube plan.Anterior end forms a distinct head with sense organ in few annelids.Appendages are simple, unjointed, and locomotory having Chitinous Setae and ParapodiaBody wall consist of

(1) Cuticle - Thin moist albuminoid cutical allow free exchange of gas.

(2) Epidermis - Single layered epidermis made up of supporting cell, sensory and glandular cell.

(3) Muscle layer - (a) Circular layer, (b) Longitudinal layer. Muscle are smooth/unstraited.

Body wall may have minute chitinous setae.

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