1«. 



Genus Panagrellus Thome, 1938 

 (Key to the species) 

 Males 



1. Spicules without bifid tips . . . ludwi-^jj (de Man, 1910) Goodey, 19U5 

 Spicules with bifid tips 2 



2. Spicules without ventral membrane expansion extending from head to tip 



leucocephalus (Steiner, 1936) Goodey, 1914? 



Spicules with ventral membrane expansion extending from head to tip 

 .3 



3. Spicule head without forward directed hook k 



Spicule head with forward directed hook 5 



h. Distal end of gubemaculum folded over to form a kind of loop 



reclivivoides (Goodey, 19U3) Goodey, 19h5 



Distal end of gubemaculum not formed into a loop 

 nepenthicola (Menzel, 1920) Goodey, I9I4.5 



5. Spicule length about U 2 times length of guoemaculum 



pycnus Thome, 1938 



Spicule length less than 3 times length of gubemaculum 6 



6. Hook on head of spicule swollen and knob-like 



redivivus (Linn., 176?) Goodey, 19i;5 



Hook on head of spicule fairly uniform in width, not knobbed 

 silusiae (de Man, 1913) Goodey, 19^5 



Genus Panagrolaimus Puchs, 1930 



Contains : 



P. annulatus (Skwarra, 1921) Thome, 1937 



P. chalographi Puchs, 1930 



P. detritophagus Puchs, 1930 



P. haloohilus Meyl, 195U 



P. heterocheilus Steiner, 1935 



P. hygrophilus Bassen, I9U0 



V. obesus Thome, 1937 



P. paralongicaudatus (Altherr, I938) Goodey, 1951 



P. picei Puchs, 1930 



P. piniperdae Puchs, 1930 



P. rigidus (gchn., 1866) Thome, 1937 



P. sexadentata Puchs, 1930 



P. spondyli Komer, 195U 



P. subelongatus (Cobb, I9II;) Thorne, 1937 



P. siiporbus Fuchs, I93O 



F. thienemanni Hirschmann, 1952 



P. venustus Fuchs, I93O 



