480 PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



Amphid 1 head-width; vulva 59%; caudal set. stiff, 8 prs.; post, ovary small Halinema Cobb 1920 

 Amphid i head-width; vulva 80^85% ; caudal set. 0; lips 6, conoid, separate 



Labial setae 6, hook-shaped, on tips of lips; amphid spiral; in mud (Dactylaimus Cobb 1920) 



Labial setae 6, not hook-shaped nor at tips; amphid round; cepb. set. 18. .Omicronema Cobb 1920 

 Ovaries 2 (for alternative see preceding page) 

 Gonads 9 outstretched: usually marine 

 Spinneret absent; marine exc. Pseudoaulqlaimus 



Habitat mud, rice fields; wings 16-32, fusing to 4 on 4-pronged tail Pseudoaulolaimus Imamura 1931 



Habitat marine 



Amphid long oval, on wide triangular plate, almost as long as head is wide Didelta Cobb 1920 



Amphid smaller, not on triangular plate 



Cervical setae bunched; 2 flat setae in front of transverse-oval amphid (Platycoma Cobb 1894) 



Cervical setae if present not bunched; amphid circular 



Pharynx long, simple, tubular; cephalic setae 6 Southerniella Allgen 1932 



Pharynx minute; ceph. set. 18, minute, in 2 circlets; amphid faint multispire Anticyathus Cobb 1920 

 Spinneret present; marine exc. Cylindrolaimus 



Habitat freshwater; ceph. set. 4; ovaries usually unequal; pharynx tubular Cylindrolaimus de Man 1880 

 Habitat marine 



Annules few, coarse; amphid saccate; cephalic setae 4; nema wide 



Number annules 17, secreted annules prominent, separated; head small. . Desmoscolex Clap. 1863 

 Number annules 32-91, secreted annules none; head concave-quadrate pyramidal Tricoma Cobb 1894 



( = Quadricoma Fil. 1922) 

 Annules if present not few nor coarse; amphid not saccate 



Gland ducts cuticularized, pores cervical & pre-anal ; striae coarse Halaphanolaimus Southern 1914 



Gland ducts and pores absent 

 Cephalic setae 10 or more 

 Pharynx with transverse cuticularized ring 

 Cavity of pharynx simple, capacious, cylindroid, J head-width. . . .Eumorpholaimus Schulz 1932 



Cavity of pharynx small, cup-shaped, rings sometimes 2 or more (Linhomoeus Bast. 1865) 



(i.e. subg. Paralinhomoeus de Man 1907 

 = Paradesmolaimus Schulz 1932) 

 Pharynx without transverse cuticularized rings 



Longest ceph. set. 4, total 16, tips simple;phar. quadrate ;amph. neck-width Halinema Cobb 1920 

 Longest ceph. set. 6, 4 short specialized at tip; phar. 0(7); multispire faint Linhomoella Cobb 1920 

 Cephalic setae 4 

 Nema wide, 10-16%; wings numerous; neck region "collared" ; amphid spiral; Richtersiinae 



Wings 50; pharynx narrow; spicula 2, equal Richtersia Steiner 1916 



Wings 16-32; pharynx capacious, open; spicula unequal, or 1 only Richtersiella Kreis 1929 



Nema slender, under 5%; wings if present not numerous 



Eyes absent; amphid circular; pharynx truncate at base Bathylaimella Allgen 1930 



Eyes often present; setae behind head usually long, numerous, conspicuous 



Oesophagus lumen not enlarged; amphid loop-shaped (Araeolaimoides (de Man) Fil. 1918) 



Oesophagus and lumen widened between eyes and nerve ring; pharynx obvious 



Shape of amphid loop-like ("folded") (Cmnonema Cobb 1920) 



Shape of amphid circular or monospiral; eyes sometimes absent(?) . . . Araeolaimus de Man 1888 

 Gonads 9 reflexed 



Spinneret absent; amphid circular, elliptical or monospiral 

 Habitat not marine; pharynx long, tubular, half as long as oesophagus 



Wings 16-32, conspic., fusing to 4 on 4-pronged tail; in rice fields Pseudoaulolaimus Imamura 1931 



Wings 0; end of tail not 4-parted; in soil Isolaimium Cobb 1920 



Habitat marine; pharynx short 



Pharynx narrow; amphid flattened, preceded by 2 flat setae Platycoma Cobb 1894 



Pharynx or linear; amphid transverse-oval, with pocket, 4 set. posterior. . Platycomopsia Ditlev. 1926 



( = Dactylonema Fil. 1927) 

 Spinneret present 

 Habitat freshwater 



Mouth cavity absent or obscure, closed 

 Amphid monospire; gland cells lateral; d" supplements protrusile tubes. . Aphanolaimus de Man 1880 



Amphid circular or elliptical; cf supplements not protrusile Tripyla Bast. 1865 



( = ProwononcAusMicol. 1923) 

 Mouth cavity definite, open, obvious 



Pharynx narrow, compound; amphid monospire, J head-width; cephalic setae 4 Paraplectus Fil. 1930 

 Pharynx simple, i.e. of 1 chamber 



The amphid small, transverse-oval or a slit; cephalic setae 6 or 10. . .Prismatolaimus de Man 1880 

 The amphid monospire, opp. pharynx; cepb. setae 4; gland cells lateral Paraphanolaimus Micol. 1923 

 Habitat marine 

 Nema wide, over 10% 

 Annules few, coarse; amphid saccate 



Body setae not dense; secreted annules prominent, separate; head small. .Desmoscolex Clap. 1863 

 Body setae dense, set along annules; junct. oesoph. & intestine indefinite. . .Greeffiella Cobb 1922 



( = TTichoderma Greeff 1869) 

 Annules if present many ; longitudinal ridges or wings 16-50; neck "collared" ; Richtersiinae 



Wings 50; pharynx narrow; spicula 2, equal Richtersia Steiner 1916 



Wings 16-32; pharynx wide, capacious; spicula unequal, or 1 only Richtersiella Kreis 1929 



Nema slender, not over 5% 

 Calvarium present as a band or plates 



Oesophagus not crenate ; calyarium of plates ; gland cells lateral Cylicolaimus de Man 1889 



Oesophagus crenate; calvarium a band (Phanodermopsis Ditlev. 1926) 



( = Galeonema Fil. 1927) 

 Calvarium absent 



Gland ducts cuticularized, pores cervical & pre-anal; striae coarse. . (Halaphanolaimus Southern 1914) 

 Gland ducts and pores none, or not cuticularized 



Denticles mid-phar., apophyses forward & back; amph. multispire (Halichoanolaimus de Man 1886) 



(=Smalsundia Allgen 1929) 

 Denticles none: amphid not multispire 



