Jain Biology: Form, Structure And Classifikation Of Animals

Published: 14.09.2009
Updated: 02.07.2015

The animal kingdom is divided into ten major groups called phyla (sing.—phylum). One of these groups is of CHORDATES and the remaining ones are NON-CHORDATES.

The group CHORDATA is considered as a phylum and is divided into four sub-phyla, of which only in one group, the notochord (a stiff rod of cells below the tubular nerve and above the alimentary canal distinguishing Chordates and Non-chordates) gets replaced by the development of a vertebral column or back bone (e.g. mammals, birds, fish, frogs and reptiles) and they are classified as VERTEBRATA. The others are considered as lower chordates or protochordates. Thus INVERTEBRATES include all non-chordata and lower chordates.

Some of the main characteristics of Vertebrata are:

Possession of back bone formed of a chain of vertebrae; presence of a skull (cranium) enclosing the brain; possession of brain and spinal cord; presence of red blood cells with haemoglobin; presence of lungs or gills for respiration; sexes are always separate.

A more up-to-date and convenient method of classifying the animal kingdom is to divide it into:[1]

  1. Sub-kingdom: Protozoa  organisms with a body which is not divided into cells; they are ACELLULAR
  2. Sub-kingdom: metazoa  organisms with a body sub-divided into number of cells; they are multicellular.

Footnotes
1:

Jump to occurrence in text

Sources

Edited by:
Prof. Muni Mahendra Kumar

© JAIN VISHVA BHARATI UNIVERSITY
Ladnun-341 306 (Rajasthan, India)

First Edition: 2008

Printed at: Shree Vardhman Press, Naveen Shahdara, Delhi- 110032

Get this book at shop.herenow4u.net

Share this page on:
Page glossary
Some texts contain  footnotes  and  glossary  entries. To distinguish between them, the links have different colors.
  1. Body
  2. Brain
Page statistics
This page has been viewed 2118 times.
© 1997-2020 HereNow4U, Version 4
Home
About
Contact us
Disclaimer
Social Networking

HN4U Deutsche Version
Today's Counter: