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Just remember.............eight legs is cool !!!!!!!!
The Class Arachnida are the most familiar of the Arthropods outside of the ever-present insects, there are over 80,000 named species and they are united by the possession of eight legs, chelicerae and pedipalps, the lack of biting and chewing mouthparts (food is ingested in most cases as a liquid, though some help is often given the food in becoming liquid by the secretion of, or regurgitating onto or into the food of, digestive enzymes from the stomach.
The Arachnids, evolved in the sea, but now they are almost entirely terrestrial and have developed several important features to help them survive on the land. These include: a waterproof (waxy) exocuticle, internal fertilisation, malphagian tubules as a metabolic excretory system and internal organs for breathing and gaseous exchange
The class Arachnida is extremely diverse in form and in lifestyles and little more can be said that includes them all. This diversity is reflected in the classification scheme shown below.
The Class Arachnida is divided into 13 subclasses, (or orders depending on which classification scheme you are following) of which the Araneae (spiders) and the Scorpiones (scorpions) are the best known.
Well that's it for now Folks, thanks for calling !
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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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