Metazoa, Biology

Assignment Help:

Metazoa

In the two kingdom classification, the unicellular 'animals' used to be clubbed together under a single phylum Protozoa that constituted sub-kingdom - Protozoa. The rest of the animals, all multicellular, were grouped under the sub-kingdom Metazoa under various phyla (the corresponding grouping for plants was Protophyta and Metaphyta). However, under the present concept of Five Kingdom Classification, this grouping has no relevance. Still, we often continue to use the term Metazoa to refer to the Animalia of the five kingdom classification. In this we start with an explanation of the levels of body organization in animals and the basic animal body plan. However, diverse the different invertebrates and vertebrates may appear to the eye, it is possible to group them in four master body plans.

These are the unicellular plan, the cell aggregate plan, blind sac plan and tube within a tube plan. The protozoan fall into the first category and the rest three structural plans are seen in the metazoans. We next list out the characteristic features of metazoans. We shall also discuss those features that are considered of fundamental importance for describing and understanding the structure and classification of any animal. These characters are:

  • Cleavage patterns and number of germ layers it has been derived from
  • Its body symmetry
  • Nature of body cavity
  •  Segmentation and cephalisation

 


Related Discussions:- Metazoa

Photosynthesis, how do i prove in a diagram that water is needed for photos...

how do i prove in a diagram that water is needed for photosynthesis

Role of chemical factors in controlling apical dominance, Role of Chemical ...

Role of Chemical Factors in Controlling Apical Dominance There were indications about the existence of plant hormones in the last part of 19th century. The plant hormones had

Prawn, explain excretory system of prawn?

explain excretory system of prawn?

Defition of soap, what SOAP is: Subjective - The data includes informa...

what SOAP is: Subjective - The data includes information obtained from the patient or the patient's family regarding the problem. Objective dat a - the data is gathered  f

What is protocooperation, Q. What is protocooperation? The Protocoopera...

Q. What is protocooperation? The Protocooperation is the ecological interaction in which both participants benefit but which is not obligatory for their survival. The Protocoop

Animal kingdom, If porifers shiw cell aggregate plan tgen how can they also...

If porifers shiw cell aggregate plan tgen how can they also shiw division of labour among cells

Agro industrial-evaluation of feedstuff, Evaluation of feedstuff In th...

Evaluation of feedstuff In the feed manufacturing process evaluation of the feed ingredients is very important in achieving consistent quality throughout the year. If one is a

Determine the organs of female reproductive system, What are the anatomical...

What are the anatomical relationships between the organs of the female reproductive system from the external vulva to the ovaries? The external female genitalia is called the v

Mammalian heart, Mammalian Heart The division of heart and separation ...

Mammalian Heart The division of heart and separation of systemic and pulmonary circulation is complete in birds and mammals. The structure of mammalian heart and also how the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd