18 



AN INTRODUCTION TO ENTOMOLOGY 



Class PAUROPODA 



The Pauropods 



The members of this class are small arthropods in which the head is 

 distinct, and the segments of the body form a single continuous region. 

 Most of the body-segments bear each a single pair of legs. Although 

 most of the terga of the body-segments are usually fused in couples, the 

 legs are not grouped in double pairs as in the Diplopoda. The antennce 

 are branched. The reproductive organs open in the third segment back 

 of the head. 



The Pauropoda or pauropods are minute creatures, the described 

 species measuring only about one twenty-fifth inch in length, more 

 or less. They resemble centipedes in the elongated form of the body 

 and in the fact that the legs are not grouped in double pairs as in the 

 Diplopoda, although the terga of the body-region are usually fused in 

 couples. These characteris- 

 tics are well-shown by the 

 dorsal and ventral views of 

 Pauropus (Fig. 22 and 23). 

 Although the pauropods 

 resemble the chilopods in 

 the distribution of their legs, 

 they differ widely in the 

 position of the openings of 

 the reproductive organs. 

 These open in the third seg- 

 ment back of the head ; that 

 of the female is single, those 

 of the male are double. 



The head is distinct from 

 the body-region. It bears 

 one pair of antennae and two 

 pairs of jaws; the eyes are 

 absent but there is an eye- 

 like spot on each side of the 

 head (Fig. 24). The first 

 pair of jaws are large, one- 

 jointed mandibles; the 

 second pair are short pear-shaped organs. Between these two pairs 



Fig. 22. — A pauropod, 

 Pauropus huxleyi, dor- 

 sal aspect (After Ken- 

 yon). 



Fig. 23. — Pauropus 

 huxleyi, ventral 

 aspect (After 

 Lubbock). 



