Hydrachnellae 



295 



claws have accessory teeth. The genital organ has two movable plates 

 and with three or six pairs of genital suckers. 



Genera and subgenera: 



1. Atractides Koch, \S31 



a. Atractides s. str. 



Type. Atractides anomcdus Koch, 1837 



b. Monatractides Viets, 1926 



Type. Atractides uniscutatus Viets, 1925 



c. Rusetria Thov, 1897 



Type. Rusetria spinirostris Thor, 1897 



d. Rusetriella Wieis, 1931 



Type. Atractides acutiscutatiis Viets, 1913 



2. Pseudotorrenticola Walter, 1906 



Type. Pseudotorrenticola rhynchota Walter, 1906 



3. Testudacarus Walter, 1928 



Type. Testudacarus tripeltatus Walter, 1928 



Pontarachnidae Thor, 1929 



Figure 224 



Diagnosis: These mites are ocean 

 livers and do not have any tracheal 

 system. The coxal plates are di- 

 vided into two groups of four each. 

 The genital organ has no movable 

 plates or genital suckers and the 

 palpi are simple and lack inner 

 protuberances. 



Figure 224 Pontaraclina punctulum 

 Philippi. Venter of female. (After 

 Walter 1925) 



Genera: 



1. Pontarachna Philippi, 1840 



Type. Pontarachna punctulum Philippi 



2. Z./mrac/z«fl Walter, 1925 



Type. Litarachna incerta Walter, 1925 



1840 



