| Etymology:- From the Greek Acantha a prickle and Kephale a head. |
Characteristics of Sipuncula:- 1)Bilaterally symmetrical and vermiform. 2)Body has more than two cell layers, tissues and organs. 3)Body cavity is a true coelom. 4)Body possesses a U shaped gut with a mouth and anus. 5)Body covered in a rubbery cuticle. 6)Has a simple brain and a ventral main nerve. 7)Has no circulatory or respiratory organs. 8)Reproduction normally sexual and gonochoristic, some species can be asexual and one species is parthenogentic. 9)Feed on algae, diatoms, protista etc., one species is a parasite. 10)All live in marine environments. |
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| These pages are here free for you to use, I would like to keep them that way, however making and running this site, and the other sites I am currently making or have made, on Birds, Mammals, Insects and Fish and Bacteria as well as all the other invertebrates costs money. There are several simple ways you can help. The first is by using the search engine here, that way you make me 2 or 3 cents a time, not a lot but it adds up.
Or you could buy a copy of my recently published book of poetry. It is called Poetry for All the Family, which describes it perfectly. Although I do publish poetry in the specialised poetry magazines the poetry in this book is specifically designed to be enjoyed by people of every age. Follow the link for more information. It is not expensive and should be thoroughly enjoyable, so if you like it please tell people about it, or better still give it to someone as a present for Christmas of a birthday. |
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