The connexion is not so intimate in Scorpio, but is nevertheless a very close one, closer than we find in any other Arthropods in which the arterial system is well developed, e.g.
Exoskeleton The outer cellular layer (ectoderm or hypodermis ) of insects as of other Arthropods, secretes a chitinous cuticle which has to be periodically shed and renewed during the growth of the animal.
Relationships And Phylogeny The Hexapoda form a very clearly defined class of the Arthropoda, and many recent writers have suggested that they must have arisen independently of other Arthropods from annelid worms, and that the Arthropoda must, therefore, be regarded as an unnatural, polyphyletic
This consideration leads us to one of the most remarkable and fascinating features of 'ant-communities - the presence in the nests of insects and other small arthropods, which are tended and cared for by the ants as their guests, rendering to the ants in return the sweet food which they desire.
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