Family IROMIDAF; de Man, I876 

 (Key to subfamilies 



1. Teeth at anterior end of stoma. . . . Subfamily IROrJINAE Micol., 1922 P. 11', 

 Without teeth at anterior end of stoma 



. Subfamily CRYPTONCHIWAS Chit., 1937 



(Contains a single species, Cryotonchus nudus Cobb, 1913) 



Subfamily IROIJINAE Micol., 1922 

 (Key to genera modified from Cobb, 1935) 



1. Female gonad monodelphic, opistodelphic. . . . Trissonchulus Cobb, 1920 

 Female gonad didelphic, amphidelphic . 2 



2. Spinneret absent. .. Ironus Bastian, 1365 



Spinneret present (in Parironus rudimentary or none) ; marine .... 3 



3. Cephalic setae absent or papilloid; pharyngeal swelling slight . . . U 

 Cephalic setae present 5 



h. Pharyngeal wall thin; pharynx 3^ Dolicholaimus de Man, 1888 



Pharyngeal wall thick; pharynx 1'''^ .... Thalassironus de Man, 1389 



5. Cephalic setae in two circles, 6 cephalic 8U subcephalic 

 Ironella Cobb, 1920 



6. Spicules paired . . . . , Parironus Micol., 1930 



Spiculas unpaired, one exceedingly long .... Conilia Gerlach, 195U 



