464 PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



Amphid known (for alternative see preceding page) 

 External amphid not spiral, circular nor elliptical, but a transverse slit 

 Female not known; amphid large 



Pharyngeal bulb not stronger dorsad; ceph. set. 10; cutic. "basket-work" on neck Nygmatonchus Cobb 1933 

 Pharyngeal bulb stronger dorsad; striae of dots 



Denticles in pharynx numerous; cephalic setae 4; in humus near sea coast Denliculella Cobb 1933 



Denticles 0; cephalic setae if present almost invisible; marine lotadorus Cobb 1920 



Female known 



Ovary 1, reflexed; habitat soil about roots 

 Tooth short, closed, not bent at tip; ovary anterior, vulva 57%; spinneret(?) present Oionchus Cobb 1913 



Tooth (spear) bent obliquely dorsad at tip when extruded; spinneret absent Campydara Cobb 1920 



Ovaries 2, reflexed; spinneret present 



Oesophageal bulbs 5-8, contiguous ; amphid with pocket ; c? supplements eurystomoid Bolbella Cobb 1920 

 Oesophageal bulbs not more than 2, not contiguous 



Tooth small, near lips; setae 0; pharynx long, tubular; in fresh water Rhabdolaimus de Man 1880 



Tooth not small; pharynx 1 head- width deep; amphid usually at lips 



Onchium curved, solid, apparently mobile radially Prochromadara Fil. 1922 



Onchium forward-pointing or irectangular, motion apparently iparallel to axis 

 Lipreg. protrusile; ceph. set. 4 ; renette long ; excretory poreopp. pharynx.. Ptycholaimell us Cobb 1920 

 Lip region not protrusile 



Neck with cuticular "basket-work"; 4 sublat. scales opp. phar.; spicula 2 sections Rhips Cobb 1920 

 Neck without "basket-work," or laterally only ; scales 0; spicula entire 

 Striae of rod-like elements, exc. towards extremities, changing to large dots laterally 



Cardiac bulb broad, well set off, valvate Punctodora Fil. 1930 



Cardiac bulb not very broad, confluent, non- valvate Neochromadora Micol. 1924 



Striae of dots, altered laterally 



Pharyngeal bulbstrongerdorsad;onch.large;card.bulb2-3-zoned . . Hypodontolaimus de Man 1886 

 Pharyngeal bulb if present not stronger dorsad; cardiac bulb not zoned. . . .Chromadora Bast. 1865' 

 External amphid spiral, circular or elliptical 



Female not known; marine or salt marsh (exc. Amphispira ?) ; wings none 



Habitat soil (possibly marine) ; amphid spiral; cephalic setae 0; spinneret present Amphispira Cobb 1920 

 Habitat marine or salt marsh 

 Amphid multispire, large, on front curvature of head 



Striae altered laterally Neotonchus Cobb 1933 



Striae not altered laterally Amphispira Cobb 1920 



Amphid not multispiral 



Onchium spear-like, free at tip Oistolaimus Ditlev. 1921 



(cf. Onyx Cobb 1891) 

 Onchium not spear-like 



Cephalic setae minute; pharyng. bulb stronger dorsad; amphid narrow, transverse lotadorus Cobb 1920 

 Cephalic setae 0; amphid circular or monospiral 



Tooth ventral Crassolaimus Kreis 1929 



Tooth dorsal; nema cephalated by expansion and by cessation of striae Micromicron Cobb 1920 



Female known 

 Ovary 1 



Gonad 9 outstretched; amphid circular; cephalic setae 4; spinneret present; marine 

 Wings 10, of V-shaped marks; phar. bulb long, set off by constrict. ; lab. papill. setose Nudora Cobb 1920 

 Wings 0; phar. bulb very slight; labial papillae 0; renette large, of 6 cells Synonema Cobb 1920 



Habitat not marine; amphid round or oval; spinneret m 

 Median oesophageal bulb present, usually valvate; tail 

 Pharynx narrow, post, part 6 times width; ceph. set. 0; < 



Habitat marine; amphid round; spinneret pres.; wings 6-20, marks V-shaped Monoposthia de Man 1889 



none exc. Udonchus 

 il conoid, then setaceous; bursa none 

 ; onch. small, basal Diplogasteroides de Man 1912 

 Pharynx not more than twice as deep as wide; cephalic setae usually present 



Onchium anterior, recurved, outward-acting Diplogaster M. Schultze 1857 



Onchium deepset, forward-pointing Acrostichus Rahm 1928 



Median oesophageal bulb absent; striae fine, plain 



Pharynx occupying i neck-length; habitat decaying bulbs (Odontopharynx de Man 1912) 



Pharynx occupying J neck-length or less 



Tooth (spear) bent obliquely dorsad at lips when extruded; soil near roots. . (Campydara Cobb 1920) 

 Tooth not bent 



Spinneret present; external amphid oval; pharyng. bulb absent; in fresh water Udonchus Cobb 1913 

 Spinneret absent; amphid circular 



Pharyngeal swelling absent; cardiac bulb valvate Macrolaimus Maupas 1900 



Pharyngeal swelling clavate; in moist soil Odontolaimus de >Ian 1880 



( = Neonchus Cobb 1893) 

 Ovaries 2 



Gonads 9 outstretched; spinneret present; habitat marine or brackish soil 

 Amphid not multispire; onehia several, often minute 

 Pharyngeal bulb none, or slight, confluent; ceph. setae 4; labial papillae 6. .Microlaimvs de Man 1880 



Pharyngeal bulb almost globular; cephalic setae 6; labial setae 6 (Bolbolaimus Cobb 1920) 



(=Bulbopharyngiella Allgen 1929) 

 Amphid multispire; striae finely dotted; pharyngeal bulb absent 



Head setose; striae not altered laterally; spicula long; apophysis none Comesoma Bast. 1865 



Head less setose; spicula short; gubernaculum with apophysis 



Male ventral pre-anal supplementary organs small, papilloid (Parasabatieria de Man 1907) 



Male supplementary organs absent (Sabatieria de Rouville 1903) 



Gonads 9 reflexed 

 Spinneret absent (for alternative see next page) 



Habitat marine; cephalic setae 4; pharyngeal bulb absent, pharynx small Spirina Fil. 1918 



(=Spira Bast. 1865) 

 Habitat not marine; tail isetaceous exc. Neodiplogaster 



Cardiac bulb valvate Poikilolaimus Fuchs 1930 



Cardiac bulb not valvate 



Pharyngeal bulb clavate, ,'0-} neck-length ; median bulb none;ceph.set.lO Odontolaimus de Man 1880 

 Pharyngeal bulb none or short, not tapering; oesoph. diplogastroid; onchium a projection 



