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  title of the text on arachnids  
         
  Arachnids are a class of arthropods, a subgroup of the invertebrates. They all have eight legs and among them we found highly diverse animals as spiders, scorpions, mites, ticks. The term arachnids is derived from Arachne, a Greek mythological figure meaning “spider”, because the spiders were the first members of this class of invertebrates. Most of the species are terrestrial.

SPIDERS
You can find spiders on all continents except Antarctica, and they have adapted to a wide range of terrestrial habitats. Spiders have eight legs, but unlike insects they do not have antennae. Spiders can inject venom. They weave webs that vary in size and shape, are light but strong and offer great elasticity in some aspects better than sintectical materials. The Brazilian tarantula found in Amazonia is the biggest spider in the world but it is not dangerous to man.

house spider
House spider
sand spider
Sand spider
Brazilian spider
Bazilian spider
     
redback spider of Australia
Redback spider (Australia)
European black spider
European black spider
black widow spider
Black widow spider

SCORPIONS
They are generally nocturnal animals that spend the day hidden under rocks and crevices. Scorpions, are either ovoviviparous or viviparous, depending on species. The baby scorpion climbs onto the back of the mother scorpion almost immediately after birth. The mother scorpion will look after her baby scorpions until they are able to hunt for themselves.

emperor scorpion
Emperor scorpion
black scorpion
Black scorpion
Iberian scorpion
Iberian scorpion

TICKS AND OTHER ACARI
Acari or acarines are extremely diverse, and their tiny size allowed them to live in almost every habitat on earth. In fact, they include more aquatic (freshwater and sea water) and terrestrial species than any other arachnid. Ticks are the largest of the class. They are parasites living on the blood of mamals and as such transmit a number of diseases.

male and female ticks
Male and female ticks
ectoparasites of vegetables
Ectoparasites of vegetables
 


 
 
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    All Texts and Illustrations © Dulce Rodrigues, 2009. All rights reserved