CHAPTER IV 



OTHER ^MYRIAPODS' 



It has already been pointed out that the Diplopoda and Chilopoda 

 were formerly associated with the less familiar Pauropoda and 

 Symphyla and regarded as orders of a class 'Myriapoda', composed 

 of Arthropoda possessing bodies formed of many similar somites 

 each provided with at least one pair of legs. It is now realised, 

 however, that the 'Myriapoda' included an unnatural assemblage 

 of superficially similar but unrelated groups which are now con- 

 sidered as separate classes, having no more relationship to one 



Fig. 15. Pauropoda and Symphyla. Left, Scutigerella sp. (body 

 length 4 mm); right, Paiiropus sp. (body length 1.5 mm.) 



another than to the Crustacea, Insecta and Arachnida. Indeed, 

 there is strong reason to suspect that the modern Symphyla are 

 closely allied to the extinct ancestors of insects. 



Class PAUROPODA 



The Pauropoda resemble the Diplopoda in having the orifice of 

 the reproductive organs on the fore part of the body, that is to say 

 in the third somite behind the head, and in the fusion of the two 



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