an - girdles; с - cephalic lobe; со - dorsal ciliated band; d - opening putting the intertentacular 

 cavity into communication with the outside environment; da - anterior group of teeth; dp - hind 

 teeth;/- keel of the bridle; go - genital papilla; p - cuticular plaques; pa - metameric papillae; 

 pa 1 - non-metameric papilla; par - papilla lying behind the girdles; pa 3 - transverse rows of post- 

 annular papillae; pu - pulvillus; s 2 - groove between the mesosoma and the metasoma; sv - ventral 

 sulcus; tc - tentacular crown. (A, B, C, D, E - after Ivanov, 1957a.) 



