July 15, 2017

Download Animal Diversity by Diana R. Kershaw (auth.) PDF

By Diana R. Kershaw (auth.)

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For example, some small marine sponges are always found in association with hermit crabs. This is a commensal relationship which benefits both, the hermit crab gaining protection and the sponge gaining mobility. Reproduction The Porifera show both sexual and asexual reproduction. In many sponges the capacity for asexual reproduction is considerable, new individuals being produced from buds which may develop in any region of the body or from fragments of the parent sponge. Another common method of asexual reproduction involves the formation of gemmules.

Virtually all motile unicellular organisms have been included in this huge phylum with little regard to their evolutionary relationships. Because of this the members of the Protozoa show much more diversity than is usual between the members of a phylum. Indeed there is a good case for regarding the Protozoa as representing not one, but several phyla, at the same level of organization. Protozoan diversity It is impossible in the space available to give more than a limited idea of the diversity achieved in both mode of life 29 Phylum Protozoa and morphology by the phylum Protozoa.

Firstly, the adult parasite has a very simple structure in comparison with a free-living protozoan such as Paramecium; and secondly, reproduction yields a vast number of potential individuals. Both characteristics are related to the parasitic mode of life. Food is freely and easily available with competition virtually absent, and surroundings more uniform. This ideal situation does have one drawback: the earthworm does not have an unlimited number of seminal vesicles and the progeny must be transferred to another host worm.

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