FREE-LIVING NEMATODES 



KEY. BASED ON MALE CHARACTERS 



19 New Species and 



2 New Genera 



PRE-ANAL SUPPLEMENTARY ORGANS PRESENT 



Suppl. organs IQ.submedian, in 2 rows of 5 each . . -m-f Thoracostona polare 25 

 Supplementary organs in a single ventral row 

 Organs 3(or 1 i n Anticoma ),f a i n t in Sp .serrata 

 Fora tubular, 1/5 as wide as long 

 Length 2 / bod y Diam.jjust in front of spicula, - 

 Length % " " ;Ant.Org. 1 tail-L'gth.f rin.anus - 

 Form companulate.very minute, deep as wide .... 

 Organs 7,equidistant > faint in Sp.edentata 

 Form cup-like, as deep as body'wall is thick 



Cardiac bulb present 



Cardiac bulb reduced to a faint swelling .. 



Form papilloid.row 3 body-widths long 



PRE-ANAL SUPPLEMENTARY ORGANS ABSENT 

 Accessory pieces to spicula absent or faint 

 Spicula suddenly hookshaped at proxinal end . 

 Spicula of usual form, cephalated by expans 

 Fora arcuate, proximae ventral to body axi 



Anticoma .subsiiilis 2 



-m-f Aplectus antarcticus 3 



-m 'f Spilophora serrata is 



-m Chromadora polaris 15 



-n T Euchromad. antarctica 20 



-n 'f Spilophora edentata ie 



-m-f Austroneraa spirurum Q 



Form somewhat L-shaped,Prox. dorsal to B'dy 

 Accessory piece or pieces to spicula presen 

 Apophysis to accessory piece bending backw rd 



Proximal ends of spicula not cephalated 



Proximal ends of spicula cephalated 



Cephalated by constriction 



Cephalated by more or less expansion 

 Form more or less L-shaped 



Structure rather robust 



Structure frail 



Form nearly straight, or arcuate 



Spicula nearly straight 



Spicula arcuate 



L'gth 2V% times anal body diameter 



L'gth l 1 /^ - not very slender 

 Apophysis to accessory pieces absent 



Spicula cephalated by contraction 



Spicula cephalated by expansion 



Cephalum set off by a constriction 



Cephalum not set off by a constriction 



-a t' Spilophora antarctica 17 

 -m-f Monhystera raeridiana 12 



-n -f- Terschellingia polaris 5 

 -ra-f Monhystera antarctica 13 



-a f Monhystera polaris 10 

 -n -f Monhystera frigida 9 



-m- Monhystera 



pilosa 7 



-m-f Monhystera uniforuis Q 

 -m f- Laxus septentrionalis 23 



-;- ':' Euchromadora meridiana 22 



-H 'f 1 Euchr. septentrionalis 19 

 -m 'f Spilophora antarctica^ 



KEY TO SIGNS 



'f', ovaries 2, symmetrical .reflexed. -^-.testes 2, one extending each way. 

 -f-, " 2 " outstretched. - n , " 2, one only outstretched . 

 -f , ovary 1 .outstretched forward, -n .testis 1, outstretched forward. 

 Abbreviations 



Ib , lip or lipregion 



on , pnaryngeal tooth 



am , anphid 



Ic , locule of cuirasse 



pp , labial papillae 

 ph , pharynx 

 oe , oesophagus 



st , cephalic setae 



sp , spinneret 



ep , excretory pore 



pc , cordifora piece 



